Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e5a86cc067f9448…

MALICIOUS

PDF

69.3 KB Created: 2020-11-22 22:39:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 450a5ed4516e81b6a856f9352358173a SHA-1: 13c76a714ba98736070723a85e84c776236a4ca3 SHA-256: 9e5a86cc067f94482368b18c2a7d1b8c5d18bec2b9d02574da57dc9cac41851b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with a high ML classifier score and ClamAV detection indicating malicious intent. The primary URL, trafffe.ru, is associated with SEO manipulation or phishing. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/123?utm_term=open+system+definition+business PDF link annotation
    • https://wavigijaburejuw.weebly.com/uploads/1/3/4/5/134588531/132295.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366633/normal_5f95c66e6d5f5.pdfIn PDF document text
    • https://pinonomobeberex.weebly.com/uploads/1/3/4/3/134318871/1268437.pdfIn PDF document text
    • https://vafuxukosa.weebly.com/uploads/1/3/4/4/134440110/xafawined.pdfIn PDF document text
    • https://pemopexo.weebly.com/uploads/1/3/4/3/134305592/nuwopux.pdfIn PDF document text
    • https://fofafobef.weebly.com/uploads/1/3/4/3/134349457/rasof.pdfIn PDF document text
    • https://xosotemup.weebly.com/uploads/1/3/4/3/134367608/f27d366e5a1a894.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f7bddb4-a0bb-4871-9ccf-2a182143fa52/bounty_hunter_1100_metal_detector_ma.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/jonajefidelamup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e4dd4aa-a9c8-4316-ac22-0950050ee481/47213120211.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/learning_guitar_scales.pdfIn 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_off0000d238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD238 5116 bytes
SHA-256: 31ad8c6f567ed7358a0daf7e758111471472a130b8cd24e44da639b900c28686
font_01_sfnt_off0000e396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE396 10824 bytes
SHA-256: 0385716d4caf096380ece87b61a337398581ac0ed70701d51605ac0edfbb382a

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