Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd568b27a199218…

MALICIOUS

PDF

80.9 KB Created: 2020-11-20 11:31:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: acfaa7d3451b3afb8c4e2655a3dd9bd8 SHA-1: 626a035a289ca9a84629dff7beddc343a5762044 SHA-256: cbd568b27a1992187f3784737a891925b9cebfdc8cfd0531b2c791f9f1d980ef
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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.
  • 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=skyrim+best+weapon+enchantment PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366653/normal_5f943a21e58b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369908/normal_5f9a68317c4b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450338/normal_5fa35eadd74c0.pdfIn PDF document text
    • https://wegogutez.weebly.com/uploads/1/3/4/3/134310606/730c67515d499f.pdfIn PDF document text
    • https://boxatikavizag.weebly.com/uploads/1/3/4/6/134680825/64742712582d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457881/normal_5fa4ab2bc2376.pdfIn PDF document text
    • https://jevemiparo.weebly.com/uploads/1/3/4/5/134501543/ead53b4d1683.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388824/normal_5f8e753c4e2c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413862/normal_5fa3b928be936.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nemafu/nezes.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/4546306804.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_off0000fe9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9A 5640 bytes
SHA-256: 21068ff8c3035e6c7caa2b349078fe58ff2e4ad79d445ba30e06f669d10abe78
font_01_sfnt_off000111b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B3 10976 bytes
SHA-256: 1372e42ba1f2946c6f568f7bcb34d5bae6f1a193fa365eff3de073c86971165d