Malicious PDF — malware analysis report

Static analysis result for SHA-256 73794d6cd06010b6…

MALICIOUS

PDF

64.1 KB Created: 2020-12-19 08:27:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb42afb528a0899ae8889a0813c6c9ba SHA-1: 1231a0419ea3c2f0dc941ec532c422b8217154c0 SHA-256: 73794d6cd06010b62c09cf480ade1046850833487ef6cd35ebd7169fd25907e8
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains an embedded URI pointing to 'trafffi.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear textual lure was extracted.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=pan+vs+original+papa+johns
    • https://cdn-cms.f-static.net/uploads/4451035/normal_5fbcb8e8637a4.pdf
    • https://cdn-cms.f-static.net/uploads/4385617/normal_5fd15b2f99252.pdf
    • https://finiluxexolije.weebly.com/uploads/1/3/1/8/131856594/zedavuk.pdf
    • https://static.s123-cdn-static.com/uploads/4367650/normal_5fc80dbbbca91.pdf
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/majimemo_sazuzeronob_malotupofe_somije.pdf
    • https://static.s123-cdn-static.com/uploads/4413976/normal_5fd08d765f2fe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ea69c83a-8746-487d-a63d-6bbaf53ec020/34838505314.pdf
    • https://uploads.strikinglycdn.com/files/8bc0b32a-a7e1-46f3-9c1a-4d1ed9ea17a2/luregatoguma.pdf
    • https://static1.squarespace.com/static/5fc56006abaecd3318401c97/t/5fd0065475371c172f2218c9/1607468628717/59982060651.pdf
    • https://s3.amazonaws.com/pazifetanegapu/46654258848.pdf
    • https://static1.squarespace.com/static/5fc0e9e3bda9c57a97be47bf/t/5fc25585173fb5383bee7f7c/1606571399576/put_reading_first_quiz.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_off0000bf2a.bin
e41638fb0c8978fc5b85419f163e755e361bad81bd7c66a653363bb2cbf4f0fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2A 5216 bytes
font_01_sfnt_off0000d0f1.bin
090475ea6d479a3f0cebe092a1c10bc8042b8c30740e6c4685f940f87c70da0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F1 10308 bytes

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