Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d74a135e583791b…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 00:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9de4c4aa4ad80eb0554e655f5cdb5de9 SHA-1: f0f36061317b84f7080fc605f1e78e740dfb6887 SHA-256: 9d74a135e583791b187bd656877fde516166a49651e125a46482d8242dfc8a4b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable or unknown domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://arcenevents.nl/site/upload/files/13016649132.pdf In PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/zexasovukitajef.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/73183684633.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/d03a2a119f6ce222c27ddb887fd4af5c/xazabamipotonesaje.pdfIn PDF document text
    • http://hydrem.ru/images/file/wuwanofuwojegajamuvoli.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/migoxusopamufu.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210914160104.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/winapasibufuki.pdfIn PDF document text
    • https://polaria.cz/images/file/dolobalivanamufaxedepil.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/66145929849.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/sikuvejusiresufoba.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140542302cae---92168498963.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/74403209764.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210920153748_759819088.pdfIn PDF document text
    • https://olterus.org/contents/files/sogegojazojiv.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/42565195794.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/95409236015.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/vajezekirupaziluveraritev.pdfIn PDF document text
    • https://defi128.com/userfiles/files/gotixokipiv.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210916_DDF2CF91DB585FA9.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/18915180969.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/majeboretatis.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109241055503104.pdfIn PDF document text
    • https://financenetwork1.treasuryandfinance.info/userfiles/file/75712311875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+transfer+notes+from+android+to+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC756 16836 bytes
SHA-256: bff643496bdefdecd67323d5fbce9fd8ffe1ca5b4eafac80fdc7270da67e8806
font_02_sfnt_off0000f260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF260 10544 bytes
SHA-256: fc1d5be4ff7a871007729bb7c1f34ee4b13cb6ced3eb6bf6646eb40b67b1eb15