Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde13cf1b149ab8c…

MALICIOUS

PDF

143.2 KB Created: 2020-11-20 03:15:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c81b3c18263ab46a60b5e25dae39ec68 SHA-1: e83b107213144941eb9ee72199ac683956306e20 SHA-256: fde13cf1b149ab8ccb67b423415ba9c9966d2f79c9310bf5dde6a883be9b3c48
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains text related to a 'car driving game for android' and the authoring application 'wkhtmltopdf', suggesting a lure. The primary IOC is a suspicious URL embedded within the document, likely leading to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • 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://trafffe.ru/aws?utm_term=car+driving+game++for+android
    • https://cdn-cms.f-static.net/uploads/4417145/normal_5fb291846c14f.pdf
    • https://cdn-cms.f-static.net/uploads/4367313/normal_5fa616e5e7e72.pdf
    • https://cdn-cms.f-static.net/uploads/4366400/normal_5f87ab29b3d2c.pdf
    • https://cdn-cms.f-static.net/uploads/4420036/normal_5fa09d96d8aea.pdf
    • https://cdn-cms.f-static.net/uploads/4454559/normal_5fa0c108f3e1e.pdf
    • https://cdn-cms.f-static.net/uploads/4409411/normal_5fb4308511092.pdf
    • https://cdn-cms.f-static.net/uploads/4387716/normal_5f9c77bc1752c.pdf
    • https://cdn-cms.f-static.net/uploads/4452835/normal_5fa7db427446c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a290c34a-a4fb-4055-a453-aa91f9e319dd/katojimawekumolasuk.pdf
    • https://s3.amazonaws.com/salosibejodod/56329476986.pdf
    • https://s3.amazonaws.com/webipejonavuv/34200870122.pdf
    • https://s3.amazonaws.com/lomogas/types_of_boundaries.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_off0001f827.bin
dc408bd40022daf21feb99f9fc0e2f1064d055dc3ab15632c93fb01d9f4b8012		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F827 4984 bytes
font_01_sfnt_off00020911.bin
355e9125f566513a6a7fcbbc5d89f556c30ce7ae31731cbbe6219c734b40c569		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20911 11304 bytes

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