Malicious PDF — malware analysis report

Static analysis result for SHA-256 85524eb6250c9348…

MALICIOUS

PDF

60.4 KB Created: 2021-02-20 20:57:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4f94aba906658c729602223a6736f33d SHA-1: 950e1e47719abd5524e69714c626a84434c7aaf3 SHA-256: 85524eb6250c9348711b0f68a30d7d12b4f61f8bf3e5fa4d99246353e4bb8b9d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one pointing to 'bologen.ru' and a query parameter suggesting a lure related to 'Assassin's Creed Brotherhood'. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, and ClamAV detected it as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/123?utm_term=assassin%2527s+creed+brotherhood+glyph+vaticano+district PDF link annotation
    • http://wildber.store/459142731660rw1y.pdfIn PDF document text
    • https://cdn.sqhk.co/sezepemanu/Am2hihi/79888321342.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379849/normal_5fef4fa4a4938.pdfIn PDF document text
    • http://lifokuvaxodime.iblogger.org/adobe_illustrator_a5_flyer_templates.pdfIn PDF document text
    • http://rewuvov.iblogger.org/xefogupavivilo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454803/normal_6019c3ac5ff56.pdfIn PDF document text
    • https://cdn.sqhk.co/vefoxewijuja/iiMihge/dipanagikudolobusimopiwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471513/normal_602104a4c7bde.pdfIn PDF document text
    • https://cdn.sqhk.co/dagufiwus/hdrjv9I/69554572378.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449012/normal_5fd1bac1f2e36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480880/normal_6016fc9a2d723.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409098/normal_5ff8b53c8476a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fizaxo/vaxetadodunujiwopuguzeba.pdfIn PDF document text
    • http://fupizasatekuw.rf.gd/24429379568.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/adobe_photoshop_photo_design_software_free.pdfIn PDF document text
    • http://ratazudawi.epizy.com/gisida.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/kaspersky_antivirus_2017_app.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_off0000b1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D9 5660 bytes
SHA-256: 50e96b181194c43ad589b234a60c11ef816dad4f87ac68f25c6488b6a0ec173d
font_01_sfnt_off0000c51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51E 9116 bytes
SHA-256: 943fd1de3b19f3594896bdf7d401e74296f87b1843a6524e30cc9b966f6a09cb

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