Malicious PDF — malware analysis report

Static analysis result for SHA-256 b206f6bc75120415…

MALICIOUS

PDF

77.4 KB Created: 2021-02-21 17:22:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 518dd50974c586a2eccc53150dc9dc2d SHA-1: 4344ef1a82251603bbe272ce19067b533f658b51 SHA-256: b206f6bc7512041525c2ee81289a961b5f51c747a9a9c0e99dbd99b06b5f50ba
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various PDF files hosted on disposable domains, a common tactic for link farms and SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://seumenha.ru/wix?keyword=chart+of+accounts+list+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4444377/normal_60013e07bae8e.pdfIn PDF document text
    • https://disesusobabetom.weebly.com/uploads/1/3/0/8/130814900/ba90b.pdfIn PDF document text
    • https://cdn.sqhk.co/kexofodatop/fhjXMIe/43341941230.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401518/normal_5fc7fb9ad8175.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479688/normal_6023561498c22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490523/normal_601b9b8768f55.pdfIn PDF document text
    • https://femobideja.weebly.com/uploads/1/3/4/7/134735935/9416963.pdfIn PDF document text
    • https://cdn.sqhk.co/posaleren/ghbhgge/58297836243.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480904/normal_601bd2ecd2224.pdfIn PDF document text
    • https://rasozonikazip.weebly.com/uploads/1/3/4/9/134904665/951202.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452835/normal_600d0a1ab60db.pdfIn PDF document text
    • https://nagipabusodeza.weebly.com/uploads/1/3/1/4/131453106/xanajur-nudanijapugek-bebufim-zadufakusedu.pdfIn PDF document text
    • https://cdn.sqhk.co/tokofape/hdjcjiq/46956867370.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/ctyggkg/w3schools_html_form_checkbox.pdfIn PDF document text
    • https://cdn.sqhk.co/kavonalitego/e6jija3/snapseed_editing_software_for_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421039/normal_60118d617ab0f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://riramemixezu.epizy.com/jaxuj.pdfIn PDF document text
    • http://budakokubogomax.rf.gd/32315452014.pdfIn PDF document text
    • http://kakiserinipo.epizy.com/que_es_arteriografia.pdfIn PDF document text
    • http://vufufule.epizy.com/feputiwibubovaxojunoz.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_off0000f308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF308 5148 bytes
SHA-256: 58ee39939cbcb5b76248da3c03123cfe3842c2eb2ea1ee9dc005f23ea076f02e
font_01_sfnt_off00010485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10485 10420 bytes
SHA-256: 9e22645ac874d712aa76146817065425c8077d10804fd07d7606fe1442616c88

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