Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a264f697846b343…

MALICIOUS

PDF

65.2 KB Created: 2020-11-24 18:58:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3e8995b77dd66344b3021110b1f0a732 SHA-1: 7a1736a48ae237276d3aafb4a6c5e048612a7bc5 SHA-256: 8a264f697846b3436a211be0fdb7241b5ffb7f2ef4991224c3744e70b5be498e
156 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 by the PDF_SEO_LINK_FARM heuristic, with one prominent link pointing to 'traffking.ru'. ClamAV and an ML classifier also flagged this file as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffking.ru/123?utm_term=fish+cheeks+amy+tan+tone
    • https://cdn-cms.f-static.net/uploads/4447098/normal_5f9d97b88dcad.pdf
    • https://cdn-cms.f-static.net/uploads/4376870/normal_5f97714132f9e.pdf
    • https://dokodajibebabek.weebly.com/uploads/1/3/2/3/132302773/vagelonipumurij-xedutowixut.pdf
    • https://cdn-cms.f-static.net/uploads/4425759/normal_5fa6d14413a54.pdf
    • https://satobolusiv.weebly.com/uploads/1/3/1/3/131398412/678b7498c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6a473297-8f7e-4792-864f-8aff1625fa56/wamebo.pdf
    • https://uploads.strikinglycdn.com/files/013ca4a5-ac6c-46ba-9163-570d1f1b37fc/2077239983.pdf
    • https://s3.amazonaws.com/nademopor/west_de_pere_middle_school_lunch_menu.pdf
    • https://uploads.strikinglycdn.com/files/97fa69f4-3ce5-4965-8c02-7de002091ce1/9693693684.pdf
    • https://s3.amazonaws.com/zupenafud/genegirosavuwudonudiwop.pdf
    • https://uploads.strikinglycdn.com/files/c36b71c3-7387-4215-b1d9-1efb0e900b47/letoposifilatojevomo.pdf
    • https://uploads.strikinglycdn.com/files/b7aad550-a726-4e22-90e3-25e9e71ea464/jomuranimomom.pdf
    • https://s3.amazonaws.com/libosokune/properties_of_gases_worksheet.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_off0000c3c7.bin
b3380a00c502fad835d44b17be9daebc49e5e933f11fb6b5fe0313507e6fe5c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C7 5032 bytes
font_01_sfnt_off0000d4d1.bin
f09c56645bfa5a85359d1d3d5b768370efd550bedd0ed90be8999a089b7b7992
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D1 10448 bytes