Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b1fce6e4c055cb…

MALICIOUS

PDF

72.9 KB Created: 2020-12-11 12:54:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f7d887f08b4e2795de0c7fd33222a8f5 SHA-1: dac5d59d41b8c41098a817792cb3603b3782f586 SHA-256: c8b1fce6e4c055cb91ee1f082a43eaea8ba9468da0730a57cd4d8242e4ae0992
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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://traffset.ru/123?utm_term=food+handlers+card+san+diego+mission+valley PDF link annotation
    • https://pixijitawe.weebly.com/uploads/1/3/4/5/134593468/2b2d1d962347.pdfIn PDF document text
    • https://zujolifuwumew.weebly.com/uploads/1/3/4/7/134773321/b80de0fb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368481/normal_5f939cb0293b4.pdfIn PDF document text
    • https://robubafo.weebly.com/uploads/1/3/4/5/134588337/pomatigovidene.pdfIn PDF document text
    • https://noperutepa.weebly.com/uploads/1/3/4/7/134721309/d75261806.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/vasagesorajirem/infinitely_many_solutions_equations_worksheet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc52ba98ef7301f8b2cc778/t/5fcd644883d2ac65cc264210/1607296073546/zitoxotabew.pdfIn PDF document text
    • https://s3.amazonaws.com/juxatop/logo_quiz_level_13_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64db67d2-b574-4a2b-b80f-feae105c3782/identifying_minerals_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/20348572749.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/68801165475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d9a3213-e5b2-4870-a68a-fb8d531d2eec/lerim.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_off0000dd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5C 5468 bytes
SHA-256: 69ad3e9fce80901bbe5f7c98a0ae6e44f6b682f4af9b56d8f28634cf88667880
font_01_sfnt_off0000efd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD9 11576 bytes
SHA-256: 38837d794337e3b76e7bcbb263563b0d81e7feeee7f6af1875cc53361dff27b3

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