Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd39aca56f6f20e…

MALICIOUS

PDF

76.0 KB Created: 2020-12-16 18:42:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e623c8daed1abfaea32624e4fa798e93 SHA-1: d781b8f63e61f9f17664fe4ea807474c84773a4a SHA-256: 6fd39aca56f6f20ee320db60ad0e56fdee88a47f6df50dc1811a61baab3329e5
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URLs and the nature of the heuristics point towards a phishing or malicious content delivery mechanism, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffnew.ru/strik?utm_term=personajes+de+piratas+del+caribe+2
    • https://cdn-cms.f-static.net/uploads/4446155/normal_5fa842fa74baa.pdf
    • https://cdn-cms.f-static.net/uploads/4367004/normal_5f8fde5698735.pdf
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/nijefakipo_fijesafelajesow_gumujaz.pdf
    • https://cdn-cms.f-static.net/uploads/4388608/normal_5f9473f4ab6df.pdf
    • https://cdn-cms.f-static.net/uploads/4385848/normal_5fad575281e75.pdf
    • https://cdn-cms.f-static.net/uploads/4377102/normal_5fb4becb2d28b.pdf
    • https://cdn-cms.f-static.net/uploads/4366668/normal_5fb580f7323c2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c12b5f06-db53-414a-bcd2-ef5da2050292/29165055919.pdf
    • https://uploads.strikinglycdn.com/files/be902501-3ba9-447e-b933-1abf4672b640/knowledge_questions_about_ethics.pdf
    • https://uploads.strikinglycdn.com/files/6326f792-7df5-477a-ac37-ecdf9dab47c0/michelangelo_impact_on_the_world_today.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_off0000eb63.bin
08031f2ddf7dc11f8ec6d5264fcdb5d5731716ae8596b35ce958b20162c01225
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB63 5416 bytes
font_01_sfnt_off0000fdd6.bin
af72386b4d0890ac149d9c56cafb1e3ee326f2512f04cd35ed90a5251dc975f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD6 11140 bytes