Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9f4b596c5db834…

MALICIOUS

PDF

51.0 KB Created: 2021-02-23 20:05:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 348da4532e11d76ab7a55d84dcb78c24 SHA-1: 02270ce08af3a93b4568d9dff8dd01eaf7020f73 SHA-256: 3b9f4b596c5db834a2415ae84aae03ac1a0859582a7be9e108a67f419554686a
182 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, suggests a lure related to downloading free content. The ML classifier and ClamAV detection further support its malicious nature, pointing towards a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6410

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=american+english+idioms+pdf+free+download In PDF document text
    • https://cdn-cms.f-static.net/uploads/4467298/normal_602c012e8f976.pdfIn PDF document text
    • https://bamutemo.weebly.com/uploads/1/3/2/6/132681362/6385031.pdfIn PDF document text
    • http://jikovuruwigifan.iblogger.org/86734599112.pdfIn PDF document text
    • https://nujetamewude.weebly.com/uploads/1/3/4/8/134881912/4135421.pdfIn PDF document text
    • http://rubivof.22web.org/ar-15_manual.pdfIn PDF document text
    • http://najefitisefema.epizy.com/wubakox.pdfIn PDF document text
    • http://midugome.rf.gd/mes_english_classroom_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/damelabijiponefutikidil.pdfIn PDF document text
    • http://wetizizokixo.epizy.com/sonebovawurupasuwel.pdfIn PDF document text
    • http://guvenaverelud.epizy.com/gewelirexevudovilubo.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/following_directions_worksheet_ks2.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/lpc_licensure_exam_study_guides.pdfIn PDF document text

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