Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d30040543071b97…

MALICIOUS

PDF

70.7 KB Created: 2020-11-14 13:00:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ddaa8bb14cff7ecd748652ddaf13ed5 SHA-1: 74d6cf1fb749d57f5412354059e4fd433a40406c SHA-256: 9d30040543071b97ea7cd94933d947ca146521582d3386701937bb16dded6367
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a suspicious domain, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/123?utm_term=tim+ferriss+morning
    • https://cdn-cms.f-static.net/uploads/4402932/normal_5f96873633530.pdf
    • https://cdn-cms.f-static.net/uploads/4465269/normal_5fab0878d804b.pdf
    • https://cdn-cms.f-static.net/uploads/4369182/normal_5f9f716d601ea.pdf
    • https://cdn-cms.f-static.net/uploads/4369508/normal_5f9bd307deb79.pdf
    • https://cdn-cms.f-static.net/uploads/4464525/normal_5fa73a12d111a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sugaguxagu/xokam.pdf
    • https://s3.amazonaws.com/sodoxi/xokapoboxawugufixixagit.pdf
    • https://s3.amazonaws.com/xokebore/human_anatomy_and_physiology_free_worksheets.pdf
    • https://s3.amazonaws.com/dorobukasawituw/zuduguw.pdf
    • https://s3.amazonaws.com/lulelepese/goat_simulator_unblocked_download.pdf
    • https://uploads.strikinglycdn.com/files/ebbb80e9-79c1-43a0-a757-572ba7aef27b/66341075509.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_off0000dc68.bin
25c9f50d9350b68753f3aa09825de6f4fa3446cf4e432c0d9d878272bd307081		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC68 4792 bytes
font_01_sfnt_off0000eca3.bin
2ffbd7eb391d419007f6cf1d976e265657430212ac9ac4c921a7dfaca02d3ce7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECA3 9952 bytes

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