Malicious PDF — malware analysis report

Static analysis result for SHA-256 942f2b0e9ce9bf2f…

MALICIOUS

PDF

78.0 KB Created: 2020-11-19 12:49:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 0e9fec9e7867515341e26cbf494cabb7 SHA-1: c2eb21200d8e0dae638c707656f52f6c9566d003 SHA-256: 942f2b0e9ce9bf2f7eae088c10394078f97832bc51879d8e5d7eb8e55d31334e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://traffking.ru/strik?utm_term=fsuipc+crack+p3d+v4 PDF link annotation
    • https://kirewigofe.weebly.com/uploads/1/3/4/3/134382955/ff423938999.pdfIn PDF document text
    • https://pedomolakikivo.weebly.com/uploads/1/3/4/4/134440841/nuwemiwed_rosokirusotipid_tapulusudagoj.pdfIn PDF document text
    • https://bafobuxog.weebly.com/uploads/1/3/4/3/134316473/4041004.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/sodokazid.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/vatuwof.pdfIn PDF document text
    • https://wuwusafofe.weebly.com/uploads/1/3/4/6/134619260/tasegojadem-vilef.pdfIn PDF document text
    • https://wemibevufiwoseb.weebly.com/uploads/1/3/0/8/130813314/kinerubefitem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389353/normal_5fa7310df0c9b.pdfIn PDF document text
    • https://mizunawakore.weebly.com/uploads/1/3/1/4/131406356/lotira.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/susonanezaj/justin_herbert_college_football.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/51332113876.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_off0000f15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15C 5368 bytes
SHA-256: b77065313a163bdceb87511b89a9fc85dc662df46ed47a37c1b493d1c056fa19
font_01_sfnt_off000103bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BD 12028 bytes
SHA-256: 88e39eefc5ec5bffc0be16b0225d5a6b4c045411714db762ebec3d14077bfd1d

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