Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e585b1c23c947b…

MALICIOUS

PDF

72.1 KB Created: 2021-04-04 15:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e1ed14678b04ec4af3ae6a1da7b1ee2f SHA-1: d9cf0523d92251d4a1737507f97403b27a660ac4 SHA-256: 18e585b1c23c947ba3659f3fde86b81d2742311fc9c01ca363d04d146a740aa5
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 pointing to various domains, many of which are associated with link farms and disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent related to SEO manipulation or content distribution. While no scripts were directly extracted, the presence of external URIs and the ML classifier's high confidence indicate a malicious document, likely intended as a lure or part of a larger distribution scheme.

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://seumenha.ru/award?keyword=word+problems+on+addition+and+subtraction+for+class+5+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459464/normal_604b79cf19412.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465388/normal_5fd07f781e3c6.pdfIn PDF document text
    • http://vinnipoh.space/english_101_lecture_notesln4vx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454556/normal_600a52b941b50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393755/normal_604175b79a485.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486535/normal_60268f5b0b818.pdfIn PDF document text
    • http://strita.space/binomial_theorem_expansion_formulalk7ga.pdfIn PDF document text
    • http://freshmind.net/nekizuzafutop43q0o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e01ea030-0111-4aca-ac9a-d1dd7526a4df/medical_terminology_book_10th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77d6303b-a843-41ba-bf00-e728486f1536/how_to_clean_the_igloo_ice_maker.pdfIn PDF document text
    • https://76df98a8-3e94-4eee-a6f5-23e1de06049b.filesusr.com/ugd/54c74c_fa9eca1c69e6486da69696e687bba1c1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dafumuxitupav/power_xl_air_fryer_cooking_manual.pdfIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_b99680ff93f548e3ac009427eee1eb00.pdf?index=trueIn PDF document text
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_74b30b76b5bf4c45b2f4228b1dc46b0c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c31c2e0-5a0f-4213-bda1-0c4a49223a54/26774173128.pdfIn PDF document text
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_34500ac2f56d4c87857bef63d4e0392f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/ray_dalio_review.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 5

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_off0000dd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD38 5576 bytes
SHA-256: 83618fbb640aba5bee9c0b498e8357a1c2872382321bb21d4dc12b289485582e
font_01_sfnt_off0000f021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF021 10152 bytes
SHA-256: fea49c73f669bb264e0b5ae7558214eaa8b3142c2a491b4866da3727bfb52636

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