Malicious PDF — malware analysis report

Static analysis result for SHA-256 a576b02530d0efe8…

MALICIOUS

PDF

72.0 KB Created: 2021-03-24 18:08:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: aa9dd2d48ec59dbd93499b6d2fbda51c SHA-1: b97c13a42da9b31b75f4b57ab8dc76e05c6609f2 SHA-256: a576b02530d0efe88b0c3077956123a6a9bb95e04308f95e5bf8aa30d22bef5d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dafemum.ru/wix?keyword=vidal+sassoon+answers+hair+dryer PDF link annotation
    • https://cdn.sqhk.co/birenejar/ggma6fY/67539790902.pdfIn PDF document text
    • http://pewagupudasita.22web.org/60237497176.pdfIn PDF document text
    • http://mobile-media.moscow/candy_crush_soda_hacked_version_free6ayii.pdfIn PDF document text
    • https://cdn.sqhk.co/kigudukolon/mQfTp5i/91129414419.pdfIn PDF document text
    • https://cdn.sqhk.co/junigofulum/ghiihaU/wadabazesogivu.pdfIn PDF document text
    • https://cdn.sqhk.co/sodonojoj/ahbVHlF/kaxewubuxonupigegigutonu.pdfIn PDF document text
    • http://tugidunamoz.22web.org/dokozelodexozopegunarimab.pdfIn PDF document text
    • http://lazadacostumercenter.com/nukefolimufimfc1w.pdfIn PDF document text
    • http://detonic-hypertonie.website/ac_circuit_analysis_calculatormhmm4.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/zidenigad/fixed_asset_depreciation_excel_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/xerabexove.pdfIn PDF document text
    • http://jabenesejamuji.rf.gd/endotracheal_suctioning_guidelines.pdfIn PDF document text
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_ac4e53c326cf488ab51270ba22c6a2e1.pdf?index=trueIn PDF document text
    • http://wevopik.rf.gd/59582338740.pdfIn PDF document text
    • http://donamekadozuxuk.rf.gd/the_art_of_war_book_review.pdfIn PDF document text
    • https://ee897e78-a157-4eb5-8a47-d615096087a2.filesusr.com/ugd/113e89_b68539ce9b98469eb758da09a601e96e.pdf?index=trueIn 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_off0000de22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE22 5072 bytes
SHA-256: 70080179deadee5aac4bc644c3fc08ea8eb202450dc14f727e45ab63f949bb2b
font_01_sfnt_off0000ef6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6F 10536 bytes
SHA-256: 3fc7f6243c4c48442d7f09298cdf0eb6fa0abaa6e39a898fc363155ff4e9296a

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