Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebcda5b769939bb1…

MALICIOUS

PDF

67.0 KB Created: 2020-12-29 23:52:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf29f5a1bf9e4c97850c4de779f8fc11 SHA-1: d86333fe3c9cacc0e7c4d2443977d3d4de9b3b06 SHA-256: ebcda5b769939bb1bdbb7cd9fe3e8ba415968ad295fbcab10009a53aa976a361
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, with a high risk score. 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 references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to appear as a document.

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/strik?utm_term=bombshells+menu+huntington+wv
    • https://cdn-cms.f-static.net/uploads/4373768/normal_5f8bb1d6c6aff.pdf
    • https://cdn-cms.f-static.net/uploads/4404990/normal_5fa5991a3b057.pdf
    • https://cdn.sqhk.co/wunokebewoz/bUhcSRl/tebifipiguxenim.pdf
    • https://cdn-cms.f-static.net/uploads/4373755/normal_5f9113eaa8fb5.pdf
    • https://static.s123-cdn-static.com/uploads/4426424/normal_5fc4f855263a1.pdf
    • https://static.s123-cdn-static.com/uploads/4486061/normal_5fcf303176c43.pdf
    • https://static.s123-cdn-static.com/uploads/4377407/normal_5fca7e61191f5.pdf
    • https://cdn-cms.f-static.net/uploads/4417834/normal_5fd1d57ca3467.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/751b230e-72c1-4dc2-a18b-8719a82ffeb3/bubble_bobble_gameplay.pdf
    • https://uploads.strikinglycdn.com/files/bec51bcf-2f19-4c4b-aa9f-c9a6d1a3bf7b/rowemonesosiri.pdf
    • https://uploads.strikinglycdn.com/files/02b61506-cb0e-4776-916f-52c8cc7e42ae/openttd_cheats_deutsch.pdf
    • https://uploads.strikinglycdn.com/files/94546193-71c6-4486-9ff3-277da0f49d1a/zeepin_tpms_c100_manual.pdf
    • https://s3.amazonaws.com/rolefosiju/37256821428.pdf
    • https://uploads.strikinglycdn.com/files/72ad8e8f-804d-40f9-8943-b7dbde0158ca/15083210830.pdf
    • https://s3.amazonaws.com/zuponefi/clumsy_ninja_game_for_pc.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_off0000c99f.bin
b64bf6979a1a034ba7bbde079f771a76487c0b96a64154f6e91922d2bd05d549
pdf-font-stream PDF embedded font (sfnt) at offset 0xC99F 5136 bytes
font_01_sfnt_off0000db13.bin
fbc4ea4cd1db4ccc1d06d0099863218d443cfe34bb0945796d8f00043e59c45f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB13 10604 bytes