Malicious PDF — malware analysis report

Static analysis result for SHA-256 937d56cf5fe79da0…

MALICIOUS

PDF

75.1 KB Created: 2021-02-18 12:10:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 9cbbd566807d70edadd02d6ff7bde041 SHA-1: d944a782d8198962490a6f77e94f8d9038d89c1e SHA-256: 937d56cf5fe79da0c47ec125a4f019b613330ab7bfe70f22e592d78d0d08bc2d
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to contain metadata related to the wkhtmltopdf tool, which can be used to generate PDFs from web content, further supporting the idea that this document is a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://baarspo.ru/123?utm_term=2006+bmw+330xi+engine+for+sale PDF link annotation
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/94ce08c4e.pdfIn PDF document text
    • http://podarokinsta365.site/logo_pertamina_hitam_putiha1bt6.pdfIn PDF document text
    • https://cdn.sqhk.co/joxopejufito/i6FhhhL/31059068519.pdfIn PDF document text
    • https://cdn.sqhk.co/dodirorip/hggfgfs/kaveborudipejijepunubaw.pdfIn PDF document text
    • https://sefedajexoxoj.weebly.com/uploads/1/3/4/4/134479396/782228.pdfIn PDF document text
    • http://mklhhhh.space/battles_of_the_ancient_world_gamef9lt5.pdfIn PDF document text
    • https://sabadefupi.weebly.com/uploads/1/3/4/3/134345863/zumeginobelaxuf.pdfIn PDF document text
    • https://lelibajoterudu.weebly.com/uploads/1/3/4/0/134042739/8226381.pdfIn PDF document text
    • https://cdn.sqhk.co/lopovekis/rifhghf/babejobodipanogawepupize.pdfIn PDF document text
    • https://cdn.sqhk.co/bipukawu/fxgjhgs/simplenote_markdown_preview.pdfIn PDF document text
    • http://reduslim-siteofficial.site/realm_defense_cheats_android60csg.pdfIn PDF document text
    • http://usesucre.pro/illinois_child_support_direct_deposit_cancellation_form1v271.pdfIn PDF document text
    • http://converstarget.ru/begozinisu03p5r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://womogesupepup.epizy.com/zabonagidometunegewomelo.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E7 5884 bytes
SHA-256: 0411b23908fcc712fde82b996bfbee93f5d1629f51fabcc4a4bcbc7a1630aaf3
font_01_sfnt_off0000f8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F0 11292 bytes
SHA-256: 0298d3aa150ca8e49e19f5fca96a7478253b72ae0af72100aedf27f90ad117a6

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