Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3aee7c3e81735e…

MALICIOUS

PDF

69.5 KB Created: 2021-10-02 09:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f9bdfd59b1d240af3fda94ff64889c5 SHA-1: d42b3e446a9e7a03c8d26f221cb8b09274d59b41 SHA-256: af3aee7c3e81735e1a6716cab82155b8d37b9773719d6dcc7ecc673ae96b3e0c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. It contains numerous embedded URLs pointing to other PDF files on various domains, suggesting a phishing or malware distribution scheme. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic specifically highlights the suspicious nature of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://qianxish.com/ckfind_image/files/65303966445.pdf
    • http://smolensk-bakaleya.ru/userfiles/file/rixalapatojulibus.pdf
    • http://eska-lift.ru/userfiles/file/76673635034.pdf
    • http://hansungid.com/userfiles/file/wiwumewesirolezubige.pdf
    • http://administratieindex.nl/images/uploads/50279130319.pdf
    • https://eclearusa.com/images/file/didoga.pdf
    • http://absolutelyneon.com/userfiles/file/gufojuvozenukezigudom.pdf
    • http://danchrisjewelry.com/userfiles/file/88408046502.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a4e572b24ca72f754db1fee40d4c7345/sevode.pdf
    • http://leaders-adv.net/userfiles/file/visovobulapurolaga.pdf
    • http://studioingtassinari.eu/userfiles/files/soxefagozuxevugonaveziwe.pdf
    • http://saimiri.name/upload/file/sunidapadewoj.pdf
    • http://good163.cn/Uploadfiles/files/tebiwolujopapeg.pdf
    • http://cuanhuaabshanquoc.vn/files/jamaropodukurujomawezomut.pdf
    • http://feynburg-uhren.de/uploads/dagetizidexizam.pdf
    • https://dpt-mh.com/uploads/news/files/3938843151.pdf
    • http://tysons-cafe.com/uploads/files/30391155329.pdf
    • https://ms01bet.com/contents/files/97265319671.pdf
    • http://annabarons.com/files/files/80282134395.pdf
    • http://webbyshoe.com/fckeditor/userfiles/file/98410183491.pdf
    • https://parlagame.net/calisma2/files/uploads/81428994671.pdf
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/28613850611.pdf
    • http://evevoyance.fr/adh/.-/file/lajorevikuxofimabalafajex.pdf
    • https://faktxeber.com/resimler/files/vonov.pdf
    • https://hopadive.cz/ckfinder/userfiles/files/jurunajumusowadafo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=infinity+causation+and+paradox+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b191.bin
70f3f1758af30b35c05aae0e3ed642616eca56d23e01ae284e17b1cad98127a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB191 10700 bytes
font_01_sfnt_off0000ca4c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4C 16792 bytes
font_02_sfnt_off0000e25e.bin
8c1a68a467daca3bbcaa4b2fe1a9faa7e6482c487bab2a205d1711d3d0e97964		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE25E 14936 bytes

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