Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5940f0e43ac524e…

MALICIOUS

PDF

69.9 KB Created: 2020-11-20 08:46:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01456b4cddfb00c2bca9f0c1734a3898 SHA-1: d54960afa216ef853a802c80e4996630e5ecc534 SHA-256: b5940f0e43ac524ee8b01f5ffc996a8b5dbdcc016d46c843066d89b3c8c59495
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the sheer volume of external links is highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/strik?utm_term=viper+wiring+diagram
    • https://cdn-cms.f-static.net/uploads/4417526/normal_5f9a14b42e95c.pdf
    • https://cdn-cms.f-static.net/uploads/4411937/normal_5f971675e53f1.pdf
    • https://cdn-cms.f-static.net/uploads/4368979/normal_5f8d10dd70f07.pdf
    • https://cdn-cms.f-static.net/uploads/4412584/normal_5f9bf38c59f41.pdf
    • https://cdn-cms.f-static.net/uploads/4464297/normal_5fa569d11798c.pdf
    • https://nunamazo.weebly.com/uploads/1/3/4/3/134311680/rufutamilalozegifek.pdf
    • https://cdn-cms.f-static.net/uploads/4405904/normal_5fa1ff3da20c0.pdf
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/zakeme.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gogoxowiniza/go_princess_precure_episode_1_english_dubbed.pdf
    • https://uploads.strikinglycdn.com/files/040455f6-4861-457a-b8a3-3ee471937a06/download_headshot_2016_sub_indo.pdf
    • https://s3.amazonaws.com/lonozote/genadisunek.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_off0000d5f7.bin
9d10c012be938489ea410728bf6630ac436058976d260123ddc163a923a0fe2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F7 5124 bytes
font_01_sfnt_off0000e76c.bin
c7488e1373fbcbc1e77d8816c5af4cc21c5931e4bbe57d6f03756f09728c5e05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE76C 10648 bytes

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