Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c6990d4eea238b2…

MALICIOUS

PDF

84.6 KB Created: 2021-01-27 09:46:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d5d1b74fa6baf7f588dca6f769488bf1 SHA-1: bf94bf0582a771fda196c327c3c1ff016b28a2cd SHA-256: 2c6990d4eea238b2d0bf70a5f177d4db32fb78aa8ddbed2c39b9bf59a92f7423
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a document designed to redirect users to malicious content or downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=root+king+apk+download+latest+version PDF link annotation
    • https://fagadixiridare.weebly.com/uploads/1/3/5/3/135304990/wajanum-jorurog-pebosozos-zaren.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374360/normal_5fd3573534c19.pdfIn PDF document text
    • https://bemozepe.weebly.com/uploads/1/3/0/7/130739793/45ed42cad2d03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369920/normal_5ff1204088945.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468563/normal_600ac9388b490.pdfIn PDF document text
    • https://vavaxomutiposev.weebly.com/uploads/1/3/0/7/130738712/4bec8e7026.pdfIn PDF document text
    • https://pazivumamitobe.weebly.com/uploads/1/3/0/7/130739218/548d8d91db5.pdfIn PDF document text
    • https://womomoko.weebly.com/uploads/1/3/4/8/134848640/0ebcf9560a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448995/normal_600729b2aa675.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419410/normal_6002b5de6cf3d.pdfIn PDF document text
    • https://gudeworidive.weebly.com/uploads/1/3/4/7/134767917/xuworixe_rebugab_lukiwe_povilafonoxod.pdfIn PDF document text
    • http://gratoraama.space/541100558916lj79.pdfIn PDF document text
    • https://nuxowodevuj.weebly.com/uploads/1/3/4/6/134609076/6130664.pdfIn PDF document text
    • https://leneguvajetuse.weebly.com/uploads/1/3/1/3/131380977/130c71c.pdfIn PDF document text
    • https://vajepagipe.weebly.com/uploads/1/3/4/0/134000011/a8112f.pdfIn PDF document text
    • http://front-glass.website/joplin_globe_obits_archivespfoc9.pdfIn PDF document text
    • https://xaperosojemi.weebly.com/uploads/1/3/0/9/130969510/vudetufasakuwon.pdfIn PDF document text
    • https://govuvafokixer.weebly.com/uploads/1/3/1/6/131607022/1791961.pdfIn PDF document text
    • http://sokfresh.fun/minecraft_diamond_pickaxe_best_enchantmentsuhjib.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_off00010cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEA 5352 bytes
SHA-256: bfee5157f5ebae6013fe7d79599a173615c76a86f8dc4676ea4b5b713f86ea76
font_01_sfnt_off00011f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4E 11196 bytes
SHA-256: b3e97ef76434b7754e3548ac78e4e41ffcb290479975ebe5a33855722027e9a7