Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e81672f74861ac…

MALICIOUS

PDF

70.9 KB Created: 2021-06-01 08:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c7ece61e3a11c6a953834f0cc6057cc4 SHA-1: b35eb878880e9f19ad6c17e1b9d921d6b95eaddb SHA-256: 25e81672f74861ac75fd6489e69130f04fbfa1fcfc01d7bef40534de4bbb9128
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body and embedded URLs suggest a phishing lure, directing users to a website that appears to be a link farm. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://inwebjor.ru/pbw?utm_term=what+is+voltage+capacitive+sensor PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387807/normal_604fe63ce9604.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490001/normal_60019c2e4de04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421218/normal_6062421d365d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481166/normal_5fdb890c2721b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446924/normal_5fe3ae2f3bd43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425759/normal_602ff2973c6f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503390/normal_5ffabf1c68bf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394060/normal_6036db171c2e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501045/normal_6026052d4302b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392656/normal_602107e02dd9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374978/normal_60446a4f4e55d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuruzinijub.pbworks.com/f/gevefawugijedivusasub.pdfIn PDF document text
    • http://dibesusajob.pbworks.com/w/file/fetch/144440763/vewixik.pdfIn PDF document text
    • http://gediripu.pbworks.com/f/42025696909.pdfIn PDF document text
    • http://dawijunegolo.pbworks.com/f/superior_tactics_rts_mod_apk.pdfIn PDF document text
    • http://wuvebag.pbworks.com/f/vukusotimoralowu.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144419112/rilaz.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/w/file/fetch/144412488/que_es_el_lider_autocrtico.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_off0000d75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75A 5268 bytes
SHA-256: 9cbe723165ed47e174c38678740b96907d8f03c913a011a3e4d9ec59f08b5bcc
font_01_sfnt_off0000e953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE953 11072 bytes
SHA-256: 123fcf4a6f020ac8cc53b46e6c653b1f15f8d32d88ca23ed78348cf65f7a2352

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