Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1cc3e8ee3cba37…

MALICIOUS

PDF

92.3 KB Created: 2021-06-08 12:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7e069b3b79f5adadab23d3e4a8ff976d SHA-1: e58efd879bfbe5586a96fb96e35e8625d42365db SHA-256: ac1cc3e8ee3cba371d48772414e4bd532c11ea58907fd23f27f6ec44ac666b5b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The primary malicious URL identified is https://kuzutuzo.ru/123, which is likely used to deliver a payload or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://kuzutuzo.ru/123?utm_term=bridge+to+terabithia+2+movie+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465127/normal_60172b50b1a4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466368/normal_5fdc552c7f3cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420915/normal_5fd6440d4e026.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445119/normal_5fe4eff459478.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404529/normal_601f95cf10f3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450421/normal_5fe3977b994fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470218/normal_60be6127d168f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381551/normal_6028920696db9.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4490920/normal_60b25267c12b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365598/normal_6064f938deecc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zekodunu.pbworks.com/f/wings_of_fire_book_4_free_download.pdfIn PDF document text
    • http://naxenuve.pbworks.com/f/31918516689.pdfIn PDF document text
    • http://lodedeti.pbworks.com/w/file/fetch/144718032/is_photo_taken_at_passport_office.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/w/file/fetch/144851316/60451944834.pdfIn PDF document text
    • http://ganosidil.pbworks.com/f/koxezisunowatog.pdfIn PDF document text
    • http://tojasakamu.pbworks.com/w/file/fetch/144598713/xagumif.pdfIn PDF document text
    • http://tebejeloxid.pbworks.com/f/20505264447.pdfIn PDF document text
    • http://zopilep.pbworks.com/w/file/fetch/144851355/nutrient_value_of_pickled_beets.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/w/file/fetch/144700542/elektro_baglamali_damar_arabesk_arklar_mp3_indir.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_off00012871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12871 5492 bytes
SHA-256: fac2989214e6ffc62665f72ce2e16dc7ebd37ca8f9b848a3a08d837d43c90f88
font_01_sfnt_off00013b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B07 12004 bytes
SHA-256: e1615f2cc56b57ab7a0dd8a017c5c18f5ca0b18632bd0ea1e5c7dfa706b5a36e

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