Malicious PDF — malware analysis report

Static analysis result for SHA-256 b278143f19225925…

MALICIOUS

PDF

76.7 KB Created: 2021-03-05 21:15:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dca14647b300a889686d7b36b6ac68ba SHA-1: 3d3e4838e9d186eadd2979ae6ab5721c87c83382 SHA-256: b278143f19225925fe8871dfc98f2a240271d17d84a2ea675361b4d3aeec42b7
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm and a lure for a password-protected archive. The embedded URLs, particularly the one pointing to vilenefex.ru, are suspicious and likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes abused for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://vilenefex.ru/strik?utm_term=principales+problemas+de+salud+en+mexico+pdf
    • http://jofufunobek.sportsontheweb.net/sylvania_dvd_player_universal_remote_codes.pdf
    • http://biomanua.website/11895005373dwdmb.pdf
    • http://sfhgfje5df.xyz/665502196865s243.pdf
    • http://sajitalunaded.22web.org/mavegaxowixuredaj.pdf
    • http://pumutug.iblogger.org/best_match_for_cancer_woman_yahoo_answers.pdf
    • https://jemaveroker.weebly.com/uploads/1/3/5/3/135391058/xepikavesopiwo.pdf
    • http://leketeko.22web.org/jutexerulosopenuvesevib.pdf
    • https://zedowami.weebly.com/uploads/1/3/1/6/131637063/muzumorum.pdf
    • https://kowabimope.weebly.com/uploads/1/3/4/3/134359524/341a81a732d1b76.pdf
    • http://strahauto.website/dikazemosodevurejoserkq6ld.pdf
    • https://dewokiwo.weebly.com/uploads/1/3/6/0/136028273/8fd35d90fee961c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://juborekif.atwebpages.com/50921590690.pdf
    • https://uploads.strikinglycdn.com/files/94bf7984-170e-4fa1-96dd-8c616a6e6b83/65092935698.pdf
    • http://jufofokisib.epizy.com/harmonic_oscillator_equation.pdf
    • https://uploads.strikinglycdn.com/files/9509e1a9-9332-45da-81dc-19466b57033b/pavazufasogefedorobisebeg.pdf
    • http://dawiwafawuz.epizy.com/fnaf_gmod_apk.pdf
    • https://uploads.strikinglycdn.com/files/64c9e53c-820f-40fc-8fb6-82747d41eb8c/shadowrun_video_game_xbox_360.pdf
    • http://jajuzefob.rf.gd/fun_addition_worksheets_for_kindergarten.pdf
    • https://uploads.strikinglycdn.com/files/efe09c3f-b6d3-4933-9be6-54526e817707/bokurometop.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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddfb.bin
3f079fe79f5f04e13140afaa7caea48bc4c1ded27a8fa408feb68829c40ac03d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFB 5312 bytes
font_01_sfnt_off0000efd5.bin
0ff7e00834dd014042bb20e86472afd166c8c1851b4fd253a25fbab62d160695		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD5 11484 bytes
font_02_sfnt_off00011542.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11542 4324 bytes

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