Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9a9ee207ad98a3…

MALICIOUS

PDF

65.7 KB Created: 2021-02-20 17:55:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 3a4785494e6975b951bbf59fd8dd424b SHA-1: 3742da285b3d7ee35bbbdbba9fedd2064c6240af SHA-256: af9a9ee207ad98a360b9aeadefb0c0d22b5764ed22d3cde12bc553042166dd91
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one pointing to a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate effort to create a deceptive web presence.

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://jacksth.ru/strik?utm_term=how+much+to+add+transmission+fluid PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368227/normal_5ff37db36af1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485436/normal_5ff78ec3af398.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466161/normal_5fcd3966d6f3f.pdfIn PDF document text
    • http://drive4mclanemilwaukee.com/school_of_dragons_free_dragon_egg_quest7dp4z.pdfIn PDF document text
    • http://lg-copyright.com/zozogokeweturaruzebasa7anex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460266/normal_601e4b292d8f7.pdfIn PDF document text
    • http://complerbnp.com/anti_terrorist_rush_3aro8k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403824/normal_600bb5eecc982.pdfIn PDF document text
    • http://tonerinkstore.com/144605024489o97d.pdfIn PDF document text
    • https://jomigotub.weebly.com/uploads/1/3/4/7/134748998/98b4b710b91b.pdfIn PDF document text
    • http://tevalevas.22web.org/russian_script_font_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kesufelitam.rf.gd/event_calendar_psd_template.pdfIn PDF document text
    • http://xumasadepa.epizy.com/bodmas_worksheets_year_9.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/51891923862.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_off0000c52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52D 5316 bytes
SHA-256: 2f4ba4c567bc01497302eeeeebdc0b27cab1f2349865b60a3e5f072fb0d6599b
font_01_sfnt_off0000d723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD723 10316 bytes
SHA-256: 9aff558774eb438ef636985ee415babd5e13a09e923f8b5c8aaeb0c6ec7547d3

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