Malicious PDF — malware analysis report

Static analysis result for SHA-256 47f05f7aa5b41f73…

MALICIOUS

PDF

83.9 KB Created: 2020-12-30 06:06:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ef2e36493bf4301c86e5b812c94a8e7 SHA-1: e7cdfac57595c197e836fdb77cb4b229e127f5b1 SHA-256: 47f05f7aa5b41f731021535d144828229bec892b09862bae455cf10709b75305
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files, which is indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=fun+race+3d+io
    • https://judenebubiz.weebly.com/uploads/1/3/4/6/134656374/2683430.pdf
    • https://cdn-cms.f-static.net/uploads/4475739/normal_5faa4c0690455.pdf
    • https://cdn.sqhk.co/gigemuji/je3jjhj/41148827178.pdf
    • https://cdn-cms.f-static.net/uploads/4470962/normal_5fda54c535486.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/03e4b49f-5ce3-42cd-879f-e3b31db53793/international_economics_theory_and_policy.pdf
    • https://uploads.strikinglycdn.com/files/6f353cef-ae66-4624-950e-660b34e509cd/laporukurubexepixabo.pdf
    • https://uploads.strikinglycdn.com/files/48cea919-647a-4d1b-8ff5-75513cd6c08e/85692882391.pdf
    • https://uploads.strikinglycdn.com/files/fe15eb8c-f9f9-4785-a542-c083c43d9b9f/old_town_dirigo_106_accessories.pdf
    • https://uploads.strikinglycdn.com/files/75a63690-6e65-45e1-8696-4136ff7cf38a/5528172561.pdf
    • https://uploads.strikinglycdn.com/files/832579d7-ca8a-4d42-9906-951cea739f5e/614061566.pdf
    • https://uploads.strikinglycdn.com/files/fc98c843-fa26-4560-a8b8-3e53b3c56d3d/19514831624.pdf
    • https://uploads.strikinglycdn.com/files/088e00b6-3e70-4e22-bf8e-efbb32555aab/dikuzimisimivimilo.pdf
    • https://uploads.strikinglycdn.com/files/db84b57d-9a91-4bc7-8db7-28f7a3aacdc1/mezefi.pdf
    • https://uploads.strikinglycdn.com/files/e50d96f5-d396-4c70-905b-f0f4a437215b/jiduzotokozumigimu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d44c.bin
508697de62438284631192ec98e710329a33e3d84c78dbc5e854aa7cf423d852		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD44C 4644 bytes
font_01_sfnt_off0000e404.bin
2d51bc0262ea4c550119ed33502befaa8fbed7a2185e57733ff5ea3c597fd614		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE404 5556 bytes
font_02_sfnt_off0000f30c.bin
efaa33b6d12e4426c7e0c50e811f91ab04a9dd434ecaf593ccc50dbe8d284d22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF30C 10864 bytes
font_03_sfnt_off000117e8.bin
e53ff70dbbc89860abb961fb57e16670640974e16b68abbb484336991170b055		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117E8 19024 bytes
font_04_sfnt_off0001342f.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1342F 4324 bytes

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