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mail-server/resources/spamassassin/20_pdfinfo.cf
mdecimus d4fe318812 Antispam implementation - part 1
2023-08-11 18:46:09 +02:00

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CFEngine3
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# SpamAssassin rules file: Pdfinfo rules
#
# Please don't modify this file as your changes will be overwritten with
# the next update. Use @@LOCAL_RULES_DIR@@/local.cf instead.
# See 'perldoc Mail::SpamAssassin::Conf' for details.
#
# <@LICENSE>
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to you under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at:
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# </@LICENSE>
#
###########################################################################
# 2014-12-02 - axb
# Info and disabled rules kept for historical & documentation reasons
# Updated rules may be added
#
# Original File: pdfinfo.cf
# Original Version: 0.6
# Info: $Id: pdfinfo.cf 895 2007-07-27 10:31:08Z alexb $
# Created: 2007-06-25
# Modified: 2007-07-19
# Original / Defunct Site URL: http://www.rulesemporium.com/plugins.htm#PDFinfo
# Author: Dallas Engelken (aka GMD :-)
# Rules contributed by Alex Broens
# Requires: PDFInfo.pm plugin
# Description: This plugin/ruleset combination will help you alleviate the new
# PDF based stock spam which began to appear mid-June, 2007.
#
#
# Changes:
#
# 0.6 - added easypdf producer rule and more no body text metas
# - tags support added, see USING TAGS below.
# 0.5 - added fuzzy test 7
# 0.4 - added new fuzzy for encyprted pdf image spams.
# - added rule to check for encryption
# 0.3 - added rules based on the new pdf_match_details() function
# - added additional fuzzy md5 rules
# - disabled static md5 rules as they are no longer hitting.
# 0.2 - added static md5 to hit full page stock spam.
# 0.1 - initial ruleset.
#
############################################
# USING TAGS
############################################
# The follow tags can be defined in an add_header line
#
# _PDFCOUNT_ - total number of pdf mime parts in the email
# _PDFIMGCOUNT_ - total number of images found inside pdf mime parts
# _PDFVERSION_ - PDF Version, space seperated if there are > 1 pdf attachments
# _PDFNAME_ - Filenames as found in the mime headers of PDF parts
# _PDFPRODUCER_ - Producer/Application that created the PDF(s)
# _PDFAUTHOR_ - Author of the PDF
# _PDFCREATOR_ - Creator/Program that created the PDF(s)
# _PDFTITLE_ - Title of the PDF File, if available
# _PDFIMGDIM_ - If PDF Contains images, the dimensions of them will be put here
# _PDFIMGAREA_ - The total area of all combined images inside the PDF(s)
# _PDFMD5_ - MD5 checksum of PDF(s) - space seperated
# _PDFMD5FUZZY1_- Fuzzy1 MD5 checksum of PDF(s) - space seperated
# _PDFMD5FUZZY2_- Fuzzy2 MD5 checksum of PDF(s) - space seperated
#
# Example add_header lines
#
# add_header all PDF-Info pdf=_PDFCOUNT_, pdfimg=_PDFIMGCOUNT_, ver=_PDFVERSION_, name=_PDFNAME_
# add_header all PDF-Details producer=_PDFPRODUCER_, author=_PDFAUTHOR_, creator=_PDFCREATOR_, title=_PDFTITLE_
# add_header all PDF-ImageInfo dim=_PDFIMGDIM_, area=_PDFIMGAREA_
# add_header all PDF-Md5 md5=_PDFMD5_, fuzzy1=_PDFMD5FUZZY1_, fuzzy2=_PDFMD5FUZZY2_
#
############################################
# GENERIC RULE EXAMPLES SHOWING EVAL USAGE
############################################
# you can match by name
# body MY_TEST_PDF eval:pdf_named('mytest.pdf')
# or you can write a regex to match dynamic file names.
# body MY_TEST_PDF eval:pdf_name_regex('/^(?:my|your)test\.pdf$/')
# you can make it case insensitive by using modifiers
# body PDF_IMGXXXXX eval:pdf_name_regex('/^IMG\D+\.\.PDF$/i')
# you can do exact image size matches
# body PDF_DEMS_150_400 eval:pdf_image_size_exact(150,400)
# you can do image to text, or image to html ratios
# rawbody PDF_TO_HTML_RATIO eval:pdf_image_to_text_ratio(0.000, 0.015)
# body PDF_TO_TEXT_RATIO eval:pdf_image_to_text_ratio(0.000, 0.008)
# you can do minimum demension matches
# body PDF_SIZE_RANGE_1 eval:pdf_image_size_range(300,300)
# you can do ranged demension matches
# body PDF_SIZE_RANGE_2 eval:pdf_image_size_range(200, 300, 250, 350)
# you can count the number of pdf mime partts
# body PDF_MIME_COUNT_1 eval:pdf_count(1,1)
# body PDF_MIME_COUNT_2_PLUS eval:pdf_count(2)
# you can count the number of images inside the pdfs
# body PDF_IMG_COUNT_1 eval:pdf_image_count(1,1)
# body PDF_IMG_COUNT_2_PLUS eval:pdf_image_count(2)
# you can determine pixel coverage
# body PDF_AREA_SMALL eval:pdf_pixel_coverage(1,100000)
# match a md5 or fuzzy md5 signature of the pdf
# body PDF_BAD_MD5 eval:pdf_match_md5('C359F8F89B290DA99DC997ED50117CDF')
# body PDF_BAD_FUZZY eval:pdf_match_fuzzy_md5('7340821445D975EEF6F5BDE2EC257900')
# Now you can match against certain details if they are found in the PDF.
# A regex match is used on the value specified, so if you want to do an
# exact match, use anchors ^value$
#
# body GMD_AUTHOR_MOBILE eval:pdf_match_details('author','/^mobile$/')
# body GMD_PRODUCER_GPL eval:pdf_match_details('producer','/(?i)^gpl ghostscript/')
# body GMD_CREATOR_PSCRIPT5 eval:pdf_match_details('creator','/^PScript5/')
# body GMD_TITLE_WORD_DOC1 eval:pdf_match_details('title','/^Microsoft Word \- Document1$/)
# body GMD_CREATED_JULY07 eval:pdf_match_details('created','/^200707/')
# body GMD_MODIFIED_JULY07 eval:pdf_match_details('modified','/^200707/')
ifplugin Mail::SpamAssassin::Plugin::PDFInfo
#######################################
# DISABLED RULES, ENABLE IF YOU WANT
#######################################
# Small area
# Disabled - Hits Ham
# body GMD_PDF_SMALL_AREA eval:pdf_pixel_coverage(1,100000)
# describe GMD_PDF_SMALL_AREA PDF Area covers 150k pixels or less
# score GMD_PDF_SMALL_AREA 0.75
# counts GMD_PDF_SMALL_AREA 51s/15h of 10615 corpus (5652s/4963h AxB) 06/25/07
# NOTE - people do send pdf's without message bodies!
# Disabled - Hits Ham
# body GMD_PDF_NO_TXT eval:pdf_image_to_text_ratio(0.000, 0.005)
# describe GMD_PDF_NO_TXT Low rawbody to pixel area ratio
# score GMD_PDF_NO_TXT 0.01
# counts GMD_PDF_NO_TXT 64s/3h of 10615 corpus (5652s/4963h AxB) 06/25/07
####################################
# HERE ARE THE LIVE RULES
####################################
######################################################################################################
# pdf image dimensions
# thin horizontal, common stox.
body GMD_PDF_HORIZ eval:pdf_image_size_range(100, 450, 240, 800)
describe GMD_PDF_HORIZ Contains pdf 100-240 (high) x 450-800 (wide)
score GMD_PDF_HORIZ 0.25
# counts GMD_PDF_HORIZ 135s/0h of 6132 corpus (4555s/1577h AxB-MANUAL) 07/11/07
# counts GMD_PDF_HORIZ 278s/0h of 34051 corpus (33259s/792h AxB2-TRAPS) 07/13/07
# near square, and small. common stox.
body GMD_PDF_SQUARE eval:pdf_image_size_range(180, 180, 360, 360)
describe GMD_PDF_SQUARE Contains pdf 180-360 (high) x 180-360 (wide)
score GMD_PDF_SQUARE 0.50
# counts GMD_PDF_SQUARE 36s/0h of 6132 corpus (4555s/1577h AxB-MANUAL) 07/11/07
# counts GMD_PDF_SQUARE 46s/0h of 34051 corpus (33259s/792h AxB2-TRAPS) 07/13/07
# thin vertical, very tall. common stox.
body GMD_PDF_VERT eval:pdf_image_size_range(450, 100, 800, 240)
describe GMD_PDF_VERT Contains pdf 450-800 (high) x 100-240 (wide)
score GMD_PDF_VERT 0.90
# counts GMD_PDF_VERT 24s/0h of 6132 corpus (4555s/1577h AxB-MANUAL) 07/11/07
# counts GMD_PDF_VERT 10s/0h of 11773 corpus (10988s/785h AxB2-TRAPS) 07/11/07
######################################################################################################
# static checksums
# all static md5 spam runs are complete as of 7/11
# if there are more, we'll add new rules.
# removed fuzzy rules dated 2007
# Get fuzzy info:
# cat msg.eml | spamassassin --debug pdfinfo 2>&1 | grep fuzzy 2>&1
# sample rules ONLY
# fuzzy checksum for bad stox
#body GMD_PDF_FUZZY1_T1 eval:pdf_match_fuzzy_md5('57EBC1FFB1A24CC14AE23E1E227C3484')
#describe GMD_PDF_FUZZY1_T1 Fuzzy MD5 Match 57EBC1FFB1A24CC14AE23E1E227C3484
#score GMD_PDF_FUZZY1_T1 0.001
# same as rule above using fuzzy md5 of pdf structure
#body GMD_PDF_FUZZY2_T1 eval:pdf_match_fuzzy_md5('653C8AA9FDFD03D382523488058360A2')
#describe GMD_PDF_FUZZY2_T1 Fuzzy MD5 Match 653C8AA9FDFD03D382523488058360A2
#score GMD_PDF_FUZZY2_T1 0.001
######################################################################################################
# pdf_match_details()
# from embedded link spam
#body GMD_AUTHOR_COLET eval:pdf_match_details('author','/^colet$/')
#describe GMD_AUTHOR_COLET PDF author was 'colet'
#score GMD_AUTHOR_COLET 4.50
# counts GMD_AUTHOR_COLET 1s/0h of 10767 corpus (9986s/781h AxB2-TRAPS) 07/11/07
# counts GMD_AUTHOR_COLET 2s/0h of 6132 corpus (555s/1577h AxB-MANUAL) 07/11/07
# from full page pdf stock spammer.
#body GMD_AUTHOR_MOBILE eval:pdf_match_details('author','/^mobile$/')
#describe GMD_AUTHOR_MOBILE PDF author was 'mobile'
#score GMD_AUTHOR_MOBILE 2.75
# counts GMD_AUTHOR_MOBILE 2s/0h of 6132 corpus (555s/1577h AxB-MANUAL) 07/11/07
# counts GMD_AUTHOR_MOBILE 55s/0h of 10767 corpus (9986s/781h AxB2-TRAPS) 07/11/07
# txt only stock spam
#body GMD_AUTHOR_OOO eval:pdf_match_details('author','/^openofficeuser$/')
#describe GMD_AUTHOR_OOO PDF author was 'openofficeuser'
#score GMD_AUTHOR_OOO 1.75
# counts GMD_AUTHOR_OOO 1s/0h of 10767 corpus (9986s/781h AxB2-TRAPS) 07/11/07
# counts GMD_AUTHOR_OOO 118s/0h of 6132 corpus (555s/1577h AxB-MANUAL) 07/11/07
# txt only stock spam
#body GMD_AUTHOR_HPADMIN eval:pdf_match_details('author','/^HP_Administrator/')
#describe GMD_AUTHOR_HPADMIN PDF author was 'HP_Administrator'
#score GMD_AUTHOR_HPADMIN 0.25
# counts GMD_AUTHOR_HPADMIN 105s/0h of 6132 corpus (4555s/1577h AxB-MANUAL) 07/11/07
# counts GMD_AUTHOR_HPADMIN 27s/0h of 11773 corpus (10988s/785h AxB2-TRAPS) 07/11/07
# generic rule for software used to produce the pdf.
body GMD_PRODUCER_GPL eval:pdf_match_details('producer','/^(?:gnu|gpl) ghostscript/i')
describe GMD_PRODUCER_GPL PDF producer was GPL Ghostscript
score GMD_PRODUCER_GPL 0.25
# counts GMD_PRODUCER_GPL 227s/0h of 6132 corpus (555s/1577h AxB-MANUAL) 07/11/07
# counts GMD_PRODUCER_GPL 85s/0h of 10767 corpus (9986s/781h AxB2-TRAPS) 07/11/07
# generic rule for software used to produce the pdf.
body GMD_PRODUCER_POWERPDF eval:pdf_match_details('producer','/^PowerPdf 0\./')
describe GMD_PRODUCER_POWERPDF PDF producer was PowerPDF
score GMD_PRODUCER_POWERPDF 0.25
# counts GMD_PRODUCER_POWERPDF 0s/0h of 10767 corpus (9986s/781h AxB2-TRAPS) 07/11/07
# counts GMD_PRODUCER_POWERPDF 0s/0h of 5641 corpus (4064s/1577h AxB-MANUAL) 07/11/07
# producer is bcl
body GMD_PRODUCER_EASYPDF eval:pdf_match_details('producer','/^BCL easyPDF/')
describe GMD_PRODUCER_EASYPDF PDF producer was BCL easyPDF
score GMD_PRODUCER_EASYPDF 0.25
# simple check for encryption used inside pdf.
# recommend meta with something else...
body GMD_PDF_ENCRYPTED eval:pdf_is_encrypted()
describe GMD_PDF_ENCRYPTED Attached PDF is encrypted
score GMD_PDF_ENCRYPTED 0.60
# counts GMD_PDF_ENCRYPTED 13s/0h of 34051 corpus (33259s/792h AxB2-TRAPS) 07/13/07
# simple check for empty msg body when there is one or more pdf attachments present.
body GMD_PDF_EMPTY_BODY eval:pdf_is_empty_body()
describe GMD_PDF_EMPTY_BODY Attached PDF with empty message body
score GMD_PDF_EMPTY_BODY 0.25
# counts GMD_PDF_EMPTY_BODY 1638s/20h of 27034 corpus (24636s/2398h AxB-MANUAL) 07/19/07
priority GMD_PDF_EMPTY_BODY 2000 # workaround for Bug 8070
######################################################################################################
# metas
#meta __GMD_PDF_CHECKSUM ( GMD_PDF_FUZZY1_T1 || GMD_PDF_FUZZY2_T1 || GMD_PDF_FUZZY2_T2 || GMD_PDF_FUZZY2_T3 || GMD_PDF_FUZZY2_T4 || GMD_PDF_FUZZY2_T5 || GMD_PDF_FUZZY2_T6 || GMD_PDF_FUZZY2_T7 ||GMD_PDF_FUZZY2_T9 || GMD_PDF_FUZZY2_T10 || GMD_PDF_FUZZY2_T11 || GMD_PDF_FUZZY2_T12 )
#meta __GMD_PDF_DETAIL ( GMD_AUTHOR_COLET || GMD_AUTHOR_MOBILE || GMD_AUTHOR_OOO || GMD_AUTHOR_HPADMIN || GMD_PRODUCER_GPL || GMD_PRODUCER_POWERPDF || GMD_PRODUCER_EASYPDF )
meta __GMD_PDF_DIMS ( GMD_PDF_VERT || GMD_PDF_HORIZ || GMD_PDF_SQUARE )
meta __GMD_PDF_PRODUCERS ( GMD_PRODUCER_GPL || GMD_PRODUCER_POWERPDF || GMD_PRODUCER_EASYPDF )
# rule hits ham by itself, so use just to meta.
body __GMD_PDF_NO_TXT eval:pdf_image_to_text_ratio(0.000, 0.005)
# meta checksum hit with image dimensions
#meta GMD_PDF_STOX_M1 ( __GMD_PDF_CHECKSUM && __GMD_PDF_DIMS)
#describe GMD_PDF_STOX_M1 PDF Stox spam
#score GMD_PDF_STOX_M1 3.25
# counts GMD_PDF_STOX_M1 159s/0h of 6132 corpus (555s/1577h AxB-MANUAL) 07/11/07
# counts GMD_PDF_STOX_M1 40s/0h of 11773 corpus (10988s/785h AxB2-TRAPS) 07/11/07
# meta checksum hit to pdf details
#meta GMD_PDF_STOX_M2 ( __GMD_PDF_CHECKSUM && __GMD_PDF_DETAIL )
#describe GMD_PDF_STOX_M2 PDF Stox spam
#score GMD_PDF_STOX_M2 2.95
# counts GMD_PDF_STOX_M2 223s/0h of 6132 corpus (555s/1577h AxB-MANUAL) 07/11/07
# counts GMD_PDF_STOX_M2 29s/0h of 10767 corpus (9986s/781h AxB2-TRAPS) 07/11/07
# meta dimensions and encryption
#meta GMD_PDF_STOX_M3 ( __GMD_PDF_DIMS && GMD_PDF_ENCRYPTED )
#describe GMD_PDF_STOX_M3 PDF Stox spam
#score GMD_PDF_STOX_M3 2.25
# counts GMD_PDF_STOX_M3 12s/0h of 34051 corpus (33259s/792h AxB2-TRAPS) 07/13/07
# meta checksum with no text
#meta GMD_PDF_STOX_M4 ( __GMD_PDF_CHECKSUM && (__GMD_PDF_NO_TXT || GMD_PDF_EMPTY_BODY))
#describe GMD_PDF_STOX_M4 PDF Stox spam
#score GMD_PDF_STOX_M4 2.95
# meta no body text along with automated pdf production.
#meta GMD_PDF_STOX_M5 ( __GMD_PDF_PRODUCERS && (__GMD_PDF_NO_TXT || GMD_PDF_EMPTY_BODY))
#describe GMD_PDF_STOX_M5 PDF Stox Spam
#score GMD_PDF_STOX_M5 1.00
endif
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