Malicious PDF — malware analysis report

Static analysis result for SHA-256 992684bd17f3f127…

MALICIOUS

PDF

72.6 KB Created: 2020-11-19 09:30:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d654044ff08dd8fa65ae648f29c1a72 SHA-1: 58619010276a2e693b8f5cdbed23619b1e716a6a SHA-256: 992684bd17f3f127c757938141acc8ed7c3f8d85643724fe697197a4b758724a
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The primary URL, https://trafffi.ru/strik?utm_term=exerc%25C3%25ADcios+sobre+%25C3%25A1cidos+e+bases+com, is likely part of a phishing or malicious redirection chain. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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
  • 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://trafffi.ru/strik?utm_term=exerc%25C3%25ADcios+sobre+%25C3%25A1cidos+e+bases+com
    • https://bilewazivabo.weebly.com/uploads/1/3/2/8/132816117/gevoworurivexavu.pdf
    • https://zixamagexiwu.weebly.com/uploads/1/3/4/0/134012381/4015273.pdf
    • https://rosuxemu.weebly.com/uploads/1/3/0/7/130776582/tonesu.pdf
    • https://pesegoniz.weebly.com/uploads/1/3/4/4/134497823/190895.pdf
    • https://xavixikani.weebly.com/uploads/1/3/4/5/134502132/4c6211d1324.pdf
    • https://kepupumi.weebly.com/uploads/1/3/4/6/134616340/787526a487959.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/733de55c-f8ac-499c-9204-4a2969acb3a6/rolls_royce_silver_shadow_for_sale_cheap.pdf
    • https://s3.amazonaws.com/felasorarabipis/lofugoruxafi.pdf
    • https://uploads.strikinglycdn.com/files/7d807f51-5c17-42e9-9d9e-3faef27af561/83830414170.pdf
    • https://s3.amazonaws.com/webipejonavuv/38384435530.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_off0000d899.bin
60947ca418dc8e8efecd78d1cfb40ed40c468fa3106f132d373a0551a0604cb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD899 5508 bytes
font_01_sfnt_off0000eab0.bin
87d44d67d5154a742f788df02ffe26fb5605ad96d1f714c8f2dab5675e4fa1ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB0 13592 bytes

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