Malicious PDF — malware analysis report

Static analysis result for SHA-256 740d1fbd724d2a71…

MALICIOUS

PDF

76.9 KB Created: 2021-01-03 13:24:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39a3101affe81b8deddbd29ff07830d8 SHA-1: d8a4ca2a87f7e6c28fe3288bae71c48814613c78 SHA-256: 740d1fbd724d2a71ec5d9cdfd6dd2df995755c00bff6c1c9f69f1fbd14db8696
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. It contains an embedded URL pointing to 'trafffe.ru', which is likely used for phishing or to download a secondary payload. The document body, though heavily obfuscated, contains text related to 'introduce yourself sample pdf' and 'wkhtmltopdf', suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=introduce+yourself+sample+pdf
    • https://cdn-cms.f-static.net/uploads/4467955/normal_5fb3055d41f56.pdf
    • https://cdn-cms.f-static.net/uploads/4384318/normal_5f8edfaa8a7db.pdf
    • https://cdn-cms.f-static.net/uploads/4383923/normal_5fd730639e4f4.pdf
    • https://cdn.sqhk.co/pozuwifofub/beKRiey/1655962664.pdf
    • https://cdn.sqhk.co/pixisuja/aogdy28/rally_s_menu_deals_2020.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d6929a3e-b01c-4b4f-93f3-3d126e046dcf/how_to_calculate_earned_media_value.pdf
    • https://uploads.strikinglycdn.com/files/b9d49c39-4d9a-41e3-8184-4371e160fd38/como_descargar_fl_studio_12_gratis_c.pdf
    • https://uploads.strikinglycdn.com/files/0d639374-23f5-427d-8bcc-f282496d2f02/74742170579.pdf
    • https://uploads.strikinglycdn.com/files/f0953be8-dedd-4009-9367-c83fa4eda391/werewibunetebil.pdf
    • https://s3.amazonaws.com/fujadabez/pevopos.pdf
    • https://uploads.strikinglycdn.com/files/5abe8d9b-9e82-4df2-9496-d9dc45efa268/mirapidatewozazezojuwe.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_off0000f0eb.bin
1a189f7d9488e27ff081dca34a651ab4953260d773ef412566eee6b931a1efd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EB 5340 bytes
font_01_sfnt_off0001030a.bin
d357bd3e01b8768fecd2267342c3a2700f03c515a20565baea2efa94eecc7a2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1030A 10472 bytes

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