Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fc4b684212c600…

MALICIOUS

PDF

63.3 KB Created: 2020-11-26 00:19:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f4a7605d124e0cda0f9e239191987fa SHA-1: 1256fe73602a07d4e5ee70b2390973580a5cc28a SHA-256: 91fc4b684212c6009d598ed00e30a2c41ca1dbdecf0f1b97656fc1c80eba3336
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external websites, suggesting a link farm or phishing attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one of these links directs to known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack pattern involves directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/strik?utm_term=250%252F40r18+rear+tire
    • https://cdn-cms.f-static.net/uploads/4370304/normal_5f97394a00e6c.pdf
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/3c840056.pdf
    • https://cdn-cms.f-static.net/uploads/4418991/normal_5fb47b93d73bd.pdf
    • https://cdn-cms.f-static.net/uploads/4374002/normal_5f8c93cd0b7c6.pdf
    • https://cdn-cms.f-static.net/uploads/4466411/normal_5fa7fa5d08c1c.pdf
    • https://zogeliwev.weebly.com/uploads/1/3/4/3/134353139/dab0f76a4f877c9.pdf
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5f8fd2ccd03a5.pdf
    • https://cdn-cms.f-static.net/uploads/4379220/normal_5fbed7efd2fc3.pdf
    • https://cdn-cms.f-static.net/uploads/4369771/normal_5f9e7e613a05a.pdf
    • https://cdn-cms.f-static.net/uploads/4370294/normal_5f8a9e9c134ff.pdf
    • https://cdn-cms.f-static.net/uploads/4367624/normal_5f8d118f68e38.pdf
    • https://cdn-cms.f-static.net/uploads/4367923/normal_5f9a1068b65b0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/87035c53-1fd0-4593-b747-9e358e65bb51/yahoo_news_john_lewis.pdf
    • https://uploads.strikinglycdn.com/files/7b67b955-0b49-4ad9-a1cd-d6f50fbdf4f4/sony_vegas_64_bits_crackeado_downloa.pdf
    • https://uploads.strikinglycdn.com/files/2f9f276a-215b-443d-aeb3-8ef954dc26f8/dorabesusinulilosu.pdf
    • https://uploads.strikinglycdn.com/files/58d828b4-9f78-4878-8e89-e4b20e0e3da2/shortcut_to_strength.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9a4.bin
5ad6a2ceade20cf0c094a40979b6743a1f9513ef59fbf6bcb4641e4e488702c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A4 5144 bytes
font_01_sfnt_off0000cb46.bin
389bdf50932de13a6f7e3ca1f984bc827d65479afe44b532b77534a8b7d23a2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB46 11272 bytes

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