Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6807d4fb987e441…

MALICIOUS

PDF

71.1 KB Created: 2021-02-02 06:38:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 07e765a166da8b9aa6dcfe562d48407c SHA-1: 9662584cef62d2b4c3307a3487012602e6bfc710 SHA-256: b6807d4fb987e441b3bc83e2b4f2b01cb2aa0b4899f4f5c89f112346f9d94639
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic in phishing and scam operations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/123?utm_term=influencer%253A+the+power+to+change+anything PDF link annotation
    • http://mivetys.xyz/being_a_man_by_paul_therouxbiji2.pdfIn PDF document text
    • https://mabaxezo.weebly.com/uploads/1/3/4/7/134766945/798067613.pdfIn PDF document text
    • http://prazdnikprosto.ru/ascites_in_catsypekm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370066/normal_5ff2735771194.pdfIn PDF document text
    • http://copyright-securityx.com/les_formes_de_phrases_cm254zh2.pdfIn PDF document text
    • http://jewlgems.com/zalisovubividexogslbi4.pdfIn PDF document text
    • http://argo-tourism.com/531237545837lqvx.pdfIn PDF document text
    • https://nolujamikudaze.weebly.com/uploads/1/3/4/8/134868466/vazawutukiko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450154/normal_601887056191c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410965/normal_5fd7c287cc607.pdfIn PDF document text
    • http://pixxel.life/lokorirejejuxarinesoro8xq6h.pdfIn PDF document text
    • http://gradstroy.su/ziwewuzop9sztf.pdfIn PDF document text
    • http://return-0.com/535687091fizhx.pdfIn PDF document text
    • http://geosen.net/buviwujip862d0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muwojes.epizy.com/ginepeberigugasapod.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/gotti_imdb_parents_guide.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_off0000d8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FA 5280 bytes
SHA-256: b31ea611e38cc66d4c271b541cb72b06adafb66c89b899ba8a2cc94a0763cdcb
font_01_sfnt_off0000eb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0A 10524 bytes
SHA-256: 37555020a934e31ddc6d077a0d5f1696ea0ec3e277ffd551416dfc03c9577f09

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