Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebaf7b100af052bb…

MALICIOUS

PDF

76.0 KB Created: 2021-01-24 15:08:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 2ba6c781ccde7b5107189d836f0e1750 SHA-1: 4c6e6fe080fe92e39b4c81a4fab0a97c6c21ff81 SHA-256: ebaf7b100af052bb51b06e382e844d1f746cc64e72b768f1827c98095d12e620
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it's part of a link farm designed to drive traffic or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, possibly leveraging embedded JavaScript for exploitation.

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://seumenha.ru/123?utm_term=architectural+design+pdf+books PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501645/normal_5ff90a4a5fcaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463533/normal_5fe9c48402213.pdfIn PDF document text
    • http://tuworiki.22web.org/cdc_group_annual_report.pdfIn PDF document text
    • https://babipuwoze.weebly.com/uploads/1/3/4/8/134865032/1961548.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472491/normal_5fcd6d341ba3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450244/normal_60097feff12ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403685/normal_5fda20da54c54.pdfIn PDF document text
    • http://nesobaka3.xyz/likovuo0h8v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424951/normal_5fef980945336.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371240/normal_5ff95f0f5b219.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410956/normal_5fe3126b30923.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479932/normal_5fe3983f11483.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xeravujowa.epizy.com/navirunofexesozosazepiriz.pdfIn PDF document text
    • http://jexititojule.rf.gd/5637670818.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_off0000ea60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA60 5612 bytes
SHA-256: df664cdf4f484b14b488c098848a0e66016e784bc4fdfae5e58a502f73e08216
font_01_sfnt_off0000fd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6B 11320 bytes
SHA-256: 7536a6c8a7f6d8caa956fafd6fc343c1d16eb2f979d8a1ed1795ece912e46918

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