Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6231413bbbe5b28…

MALICIOUS

PDF

71.0 KB Created: 2021-06-07 07:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 030644ba08813fe74ea9fd84e70dca51 SHA-1: 40c321eb3f3a71dd183b000d335faae571604a59 SHA-256: f6231413bbbe5b28a463964c433739ac594f858a886cbb99e3cae51b39b4e819
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with one prominent URL pointing to a site that appears to be part of a phishing or scam operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

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://synerhu.ru/pbw?utm_term=how+to+study+for+spanish+proficiency+test PDF link annotation
    • https://sugodaxekot.weebly.com/uploads/1/3/1/8/131872070/705029.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412159/normal_60106c979c108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464083/normal_601b3df06debf.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4389095/normal_60b4065907be2.pdfIn PDF document text
    • https://xosetumigex.weebly.com/uploads/1/3/4/3/134371377/b56a1abd38aaa.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4370533/normal_60b3bee3508ac.pdfIn PDF document text
    • https://tisitijalazog.weebly.com/uploads/1/3/6/0/136017937/32cc5d2ac837b61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450336/normal_5ff4122e5e321.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367656/normal_600c8a9ba73a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490132/normal_5fe885181f407.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xosufixemuf.pbworks.com/f/convertir_un_archivo_de_word_a_online_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ad491a4-4b4a-462a-aeb9-3758b620dfea/simulacra_and_simulation_book_by_jean_baudrillard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c54a94c-0606-4956-a22b-05d28d196111/38617231599.pdfIn PDF document text
    • http://pexovobef.pbworks.com/w/file/fetch/144683139/giximumiwanuvatoxuwumexow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4eb8b9b-9a23-4cd8-bb82-47d748ed3571/fezimivilerarifadete.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97F 5368 bytes
SHA-256: b1c38b595e693d3f94b867839629d93c12ff0a39a3bdea28b7fa69bd297972d9
font_01_sfnt_off0000ebd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD4 10384 bytes
SHA-256: 064a4f867ff6898f85d16e3b676ce7d6c1a29facca3d31d0da9a6ea88846bc0d

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