Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5388b10b9f86ad…

MALICIOUS

PDF

66.5 KB Created: 2021-01-31 05:46:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 3a386a68e328de3ab789fcaa867f20ee SHA-1: 893aa66ec7c1130aa499cc558c41c0fb79b94c21 SHA-256: 8c5388b10b9f86adfd0fc8aec18a6aa587d9b005d9c19b30e10625651e25f8d2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains numerous embedded URLs, with a primary one pointing to 'seumenha.ru', likely serving as a lure for users seeking educational answers. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or further malware deployment.

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/123?utm_term=personal+math+trainer+lesson+13.1+answer+key PDF link annotation
    • http://tiktokcopyrighthelpteam.com/libros_sobre_minimalismo_en_espaol7bdn3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458404/normal_5fd1d154d6f41.pdfIn PDF document text
    • https://lififotepul.weebly.com/uploads/1/3/4/3/134339298/divixezerux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374024/normal_5ff22c2db568b.pdfIn PDF document text
    • http://blu-ital.space/powered_by_android_loopzl6y0.pdfIn PDF document text
    • https://luxakanodaz.weebly.com/uploads/1/3/4/5/134589800/dikadupozofa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459163/normal_5fff7291e937f.pdfIn PDF document text
    • https://fuxakenaz.weebly.com/uploads/1/3/4/5/134589300/firulotuwemedawi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463286/normal_5fd91802157a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465905/normal_601589423ab41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485568/normal_5fc74ac01f1e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405459/normal_5fcbc7bbda341.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379498/normal_5fea1d8322222.pdfIn PDF document text
    • http://steblin.pro/c_programming_book_in_hindi4bnn7.pdfIn PDF document text
    • http://m-ryanaf.site/940075281720e2oa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/venerated_warrior_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/43570006856.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/double_bed_sheet_sets_on_sale.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_off0000c6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EF 5432 bytes
SHA-256: 607d56f117446fbb65f6b2ca97c3177df2f3107cccd309137406f26145067169
font_01_sfnt_off0000d959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD959 10416 bytes
SHA-256: fd3f409b7bacc0a51265199eed04fa49d0b69c3345a530c891f7393b2364b6e0

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