Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6a65991078faad…

MALICIOUS

PDF

78.1 KB Created: 2021-05-21 00:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: f1faaf6e12effa439d09fc846e62a531 SHA-1: ae5a0ca4d017a7f22ef71744425e851dec83d561 SHA-256: cf6a65991078faada6ae2e7770bb9c4e22c8e5acd881daf96af334f0bd4c9e44
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, a common tactic for link farms used to distribute phishing pages or malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious content, likely as part of a phishing campaign.

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://jacksth.ru/strik?utm_term=el+caballo+de+troya+mito+corto PDF link annotation
    • https://viwekaxirudadax.weebly.com/uploads/1/3/4/7/134700275/wamejaxikewegofipa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406806/normal_60221725a0caf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420030/normal_6030446c5bc03.pdfIn PDF document text
    • https://supavutoni.weebly.com/uploads/1/3/4/7/134713891/ba38b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503035/normal_6066df30c003a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394082/normal_601b9797efbb8.pdfIn PDF document text
    • https://gobufitiribe.weebly.com/uploads/1/3/5/3/135321776/zabupazidokug-jidawapu-bunebilolurakef-guxubapovu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468554/normal_5fe97fcc2b9ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393363/normal_5fec11d0ec3bf.pdfIn PDF document text
    • https://betirowi.weebly.com/uploads/1/3/4/6/134661799/67a6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449177/normal_6019973e21082.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415944/normal_6036b29500923.pdfIn PDF document text
    • https://simefaburiso.weebly.com/uploads/1/3/0/8/130814859/63e050c.pdfIn PDF document text
    • https://dabusoze.weebly.com/uploads/1/3/4/5/134585091/4503.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386839/normal_606686fb91934.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/fibesezati/troy_bilt_string_trimmer_electric_starter.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/best_free_android_mobile_games_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/digital_manufacturing_for_dummies.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/how_to_replace_pump_belt_on_bissell_proheat_2x.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/97061075285.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_off0000f17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17F 5108 bytes
SHA-256: 98557458027280c13cbcd26512e1cb158f2a7e6bca815381746ab562056198a1
font_01_sfnt_off000102d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D0 11792 bytes
SHA-256: 86631d150415c0892738ec96488f175f3add74d519963458896b45a55490610a

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