Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c5260fac52eb32…

MALICIOUS

PDF

69.5 KB Created: 2020-11-29 15:24:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a72577f122a12e50ece3307376ce04df SHA-1: 1a903e12006055d73c3316067143dcea637c984f SHA-256: 12c5260fac52eb32b94357edd5bb42ae18e3e7338db6df3fe31c4eeb0cc29b3e
104 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, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism for malware distribution. The ML classifier strongly indicated maliciousness, and the presence of a "link farm" heuristic further supports this. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://trafffi.ru/aws?utm_term=official+bocce+rules+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407818/normal_5fb4b9ceb79bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486521/normal_5fb2d6b8c278e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469136/normal_5fa5bbf95b662.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372100/normal_5f941cb333e50.pdfIn PDF document text
    • https://zavamemedu.weebly.com/uploads/1/3/4/3/134305249/temabot.pdfIn PDF document text
    • https://sotufipepu.weebly.com/uploads/1/3/4/5/134595957/makupis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421957/normal_5fc1b3c61460b.pdfIn PDF document text
    • https://kakawugob.weebly.com/uploads/1/3/0/9/130969990/225f86e.pdfIn PDF document text
    • https://delazodudiz.weebly.com/uploads/1/3/4/5/134591817/lufopojipiwuredenoni.pdfIn PDF document text
    • https://bafixexewav.weebly.com/uploads/1/3/4/3/134352321/gutemujetesabosebanu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369775/normal_5f8f850a1715c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78D 5012 bytes
SHA-256: e7e0be0da25f9c4a82da46d75e69a3a93cd494034f84098f67fa31187cc507c8
font_01_sfnt_off0000d898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD898 10252 bytes
SHA-256: f8ef36335e95224ea199f95397d0d5a62ed41726b954fd85b402753e7a3e5249
font_02_sfnt_off0000fbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBA 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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