Malicious PDF — malware analysis report

Static analysis result for SHA-256 688c06fff885bbc1…

MALICIOUS

PDF

80.4 KB Created: 2021-02-20 23:54:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: e8c478cfc404c06fcc2b202728435f7f SHA-1: 3da9a49c42b3424a2602cc9f9c2318ece43ad19d SHA-256: 688c06fff885bbc16ddc96eb98ab984e1c8cfbb53659094efd2f572cf5c1e1fb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable hosting. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF versions of web pages, reinforcing the link farm hypothesis.

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://leonvi.ru/wix?keyword=warband+beginner+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4530868/normal_5ffefa8be49e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448558/normal_5fe639408f44b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385880/normal_60209ea8b5613.pdfIn PDF document text
    • http://reduslimitalia-oficial.site/1089402364573pgu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389570/normal_60023da8ae2d3.pdfIn PDF document text
    • http://subfamjtii.site/linear_algebra_and_its_applications_5th_editionrouso.pdfIn PDF document text
    • https://laxabuzataz.weebly.com/uploads/1/3/4/3/134385801/guxokiponob.pdfIn PDF document text
    • https://peminikagi.weebly.com/uploads/1/3/1/8/131856713/xefunixidupum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381752/normal_5fdf4560e28f9.pdfIn PDF document text
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/nivurugijowonobo.pdfIn PDF document text
    • http://abanca-electronica.com/coles_gluten_free_fruit_cake_slices4a96n.pdfIn PDF document text
    • https://cdn.sqhk.co/pasojixaju/U6iKjaj/80061612451.pdfIn PDF document text
    • https://temeromaxuzi.weebly.com/uploads/1/3/4/7/134745627/6234616.pdfIn PDF document text
    • http://return-0.com/904716902061wv3o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420448/normal_60174fbe78679.pdfIn PDF document text
    • https://jabibodusap.weebly.com/uploads/1/3/2/6/132681053/2087cd3bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529780/normal_6018358157370.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465249/normal_5feed8c5039e9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001004f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004F 4936 bytes
SHA-256: 13c0f5f93e79b66d52ac62c41fc8858ebdc9772356f3af12ffb53e717938e6fe
font_01_sfnt_off00011133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11133 10368 bytes
SHA-256: b3f66de373c46e4e66eb23875abc5168a7669f3f1132773b6bca83dd01228130

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