Malicious PDF — malware analysis report

Static analysis result for SHA-256 97df1c9eef393a13…

MALICIOUS

PDF

71.2 KB Created: 2020-11-14 10:24:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b9b11e16f0647095ec28203ab9fe395 SHA-1: 132ad658343648ae84f9c0e27f29801ee181940f SHA-256: 97df1c9eef393a13299b4db7f9b339c5851f6ff551a073ba70f63f69b34d0a48
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'trafftec.ru', which is likely a malicious domain used to host a phishing page or download a second-stage payload. The document body, though heavily obfuscated, appears to relate to unit conversion, a common lure for phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/123?utm_term=conversion+250+mm+to+inches
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5f871d6459ff8.pdf
    • https://cdn-cms.f-static.net/uploads/4409798/normal_5fab726224a19.pdf
    • https://cdn-cms.f-static.net/uploads/4412378/normal_5fa9022ebc2f4.pdf
    • https://cdn-cms.f-static.net/uploads/4366676/normal_5f97847da1c87.pdf
    • https://cdn-cms.f-static.net/uploads/4380083/normal_5f8bc0ad1a6bf.pdf
    • https://cdn-cms.f-static.net/uploads/4367643/normal_5f8a8b93498ec.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tulosa/rabawigenupunoximebozo.pdf
    • https://s3.amazonaws.com/xapidajovaji/magnetic_reflex_insoles_pears_and_peaches_reviews.pdf
    • https://s3.amazonaws.com/fakuguvil/building_construction_illustrated_5th_edition_free_download.pdf
    • https://s3.amazonaws.com/xazarujokemus/17173343321.pdf
    • https://s3.amazonaws.com/zakunafu/red_sea_crossing_game.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c396.bin
1bdcdfc6058026ec9c3bff5a7a768c0e077421be501c94b47e8630bc804a4055		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC396 5160 bytes
font_01_sfnt_off0000d508.bin
4d7ac64f904cec0f970fdebcc0f2a5aeefb164db78ee1f29476944e2fa97f06b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD508 10908 bytes
font_02_sfnt_off0000fa89.bin
ef9323e26955db39f18b69b53a8e1995be71b28ec6f7babd50e338e514b87afd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA89 16272 bytes

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