Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c9037f8070a7336…

MALICIOUS

PDF

69.8 KB Created: 2021-01-10 19:10:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: c0c11010bfd7acda8552d530107134a4 SHA-1: 7a87a7efc3666ede39060e5962203ddd5373899f SHA-256: 0c9037f8070a733632589c4288ad64ded152e7437bf272f47fbeeaee97b49835
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, indicating a likely attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'video er link from facebook' and is associated with wkhtmltopdf, suggesting a lure for potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/aws?utm_term=video+er+link+from+facebook PDF link annotation
    • https://site-1175777.mozfiles.com/files/1175777/kabesitarowusa.pdfIn PDF document text
    • https://site-1177257.mozfiles.com/files/1177257/26558876501.pdfIn PDF document text
    • https://site-1171956.mozfiles.com/files/1171956/romutugub.pdfIn PDF document text
    • https://cdn.sqhk.co/gogamosujimi/igrckii/52887177881.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449421/normal_5fd9d8b2e94de.pdfIn PDF document text
    • https://cdn.sqhk.co/mujexoxa/tfIjc1B/18471585760.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/busixakowun_zefisuni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422893/normal_5fa6dc9d1212f.pdfIn PDF document text
    • https://ribifafugulif.weebly.com/uploads/1/3/4/6/134650062/dekexinin.pdfIn PDF document text
    • https://site-1171656.mozfiles.com/files/1171656/71581930330.pdfIn PDF document text
    • https://site-1173584.mozfiles.com/files/1173584/20548084482.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/iejhKih/93779326450.pdfIn PDF document text
    • https://site-1168129.mozfiles.com/files/1168129/sandeep_maheshwari_wife_name_ruchi.pdfIn PDF document text
    • https://cdn.sqhk.co/dudazume/LvidJS7/34125671592.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_off0000d56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56E 5156 bytes
SHA-256: 82a1caf225be203c11baad460253e17f1ffe96a2e6656929e7e3ef3a247a3c98
font_01_sfnt_off0000e6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E3 10724 bytes
SHA-256: e0bb56388ea379c88b35abb2f28951d385dace9734e090660a8abdceb56bc8e9

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