Malicious PDF — malware analysis report

Static analysis result for SHA-256 97466cf8f4c397ad…

MALICIOUS

PDF

76.2 KB Created: 2021-06-01 11:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f074a9bb418b8a436380366d224a6ab6 SHA-1: 7fc3685e1924f55fa7a1d8fdb4cb362daf63a382 SHA-256: 97466cf8f4c397ad5beea39146980da5d1ec3f2c0fb2e4a463847856c0e8c3a2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with heuristics indicating it functions as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of external URIs and the link farm nature point towards the document's primary function being to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://krisoc.ru/pbw?utm_term=how+many+amps+to+mig+weld+10mm+steel PDF link annotation
    • https://ribovaboj.weebly.com/uploads/1/3/0/7/130775049/6715674.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486965/normal_5fe0d2f5d341d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374703/normal_6032d844e1f84.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478968/normal_5fcf93a96a59a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450037/normal_5fc572651105b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375353/normal_5fcd3b7e5527d.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4474457/normal_60b16439256fa.pdfIn PDF document text
    • https://lufuroxula.weebly.com/uploads/1/3/1/4/131408913/tumetupubewevi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454163/normal_603571f304601.pdfIn PDF document text
    • https://bevoveruluvubox.weebly.com/uploads/1/3/4/4/134468080/40ed4ebe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485435/normal_5ffe9e53e435d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380228/normal_6049e0fb0b09e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466364/normal_603be824dda05.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/30d5e219-e5d4-4aa6-ace7-23bc9eb5e67d/singer_futura_xl_400_software_windows_10.pdfIn PDF document text
    • http://wusagem.pbworks.com/f/wanokuxojekofixokifinujov.pdfIn PDF document text
    • http://lekuzax.pbworks.com/w/file/fetch/144417774/vibusarozemuxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/592a8427-90d0-4923-a3d9-6860cea3ebdb/70670800454.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/424ca471-2978-4eaa-9078-a4c83bc00489/wovajofobizaritinomipiles.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/f/quadratic_equation_project_in_java.pdfIn PDF document text
    • http://marutipug.pbworks.com/f/thuppakki_full_movie_download_tamilgun.pdfIn PDF document text
    • http://vowujepojez.pbworks.com/f/josuwaja.pdfIn PDF document text
    • http://neruwuk.pbworks.com/f/printable_calendar_2021_may_through_august.pdfIn PDF document text
    • http://banusiv.pbworks.com/f/vexoxu.pdfIn PDF document text
    • http://zepadatoju.pbworks.com/f/who_won_mega_cash_days_2020_spoilers.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_off0000ec38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC38 5532 bytes
SHA-256: 5ba1787868ed5fffd775e09778b427f5fd49dcd8cb91e5b8bc0933edec06c480
font_01_sfnt_off0000ff17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF17 10440 bytes
SHA-256: 4d1e653d669ff7e843178dfb9e4b51062275a4159e4aafe13ed9003334ef72c8

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