Malicious PDF — malware analysis report

Static analysis result for SHA-256 387c43feb8a723a2…

MALICIOUS

PDF

71.3 KB Created: 2021-01-08 17:04:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60db12cd9d76637518720fb07fbc8e20 SHA-1: d5270092c2c1d5d6c1ed96fa823b1dd9e6a6df18 SHA-256: 387c43feb8a723a221763d86e77c7e9eb0edc2514837c6366955dc3b4724a106
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that leads to 'traffine.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, and the presence of embedded URLs points towards a social engineering tactic to redirect users to malicious content.

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://traffine.ru/aws?utm_term=mathematics+94+answer
    • https://cdn-cms.f-static.net/uploads/4415061/normal_5fb25f09e31ae.pdf
    • https://static.s123-cdn-static.com/uploads/4447464/normal_5fceeee29f751.pdf
    • https://cdn-cms.f-static.net/uploads/4451368/normal_5fa5e93ae7d59.pdf
    • https://static.s123-cdn-static.com/uploads/4490949/normal_5fde593c0398f.pdf
    • https://zopoxetofosifa.weebly.com/uploads/1/3/4/8/134863155/9c08622679b0d.pdf
    • https://cdn-cms.f-static.net/uploads/4386337/normal_5f9b670865fce.pdf
    • https://static.s123-cdn-static.com/uploads/4474979/normal_5fca8d9fdf3a1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d006e57e-e9b9-47a0-bb90-4a80c960d61c/redshift_cinema_4d_manual.pdf
    • https://uploads.strikinglycdn.com/files/b8d30c1a-985d-454a-84a7-5c8579297313/dugukufop.pdf
    • https://uploads.strikinglycdn.com/files/579ad978-7373-41b5-9b24-03255d0a6a81/cold_war_release_date_beta_xbox.pdf
    • https://uploads.strikinglycdn.com/files/9fcd7340-5462-448f-a79e-47977e7e0f7b/vocabulary_workshop_level_e_unit_5_answers_synonyms.pdf
    • https://uploads.strikinglycdn.com/files/ead1c81c-cd53-4ff6-9f63-28a3b79d95a0/87523707935.pdf
    • https://uploads.strikinglycdn.com/files/5ab98eb7-29f5-4aff-8c84-ec38d152c98d/kobaneletesus.pdf
    • https://uploads.strikinglycdn.com/files/b539b7b8-f8db-4531-bbe7-598cf83e545f/22819525980.pdf
    • https://s3.amazonaws.com/litunux/9543710516.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_off0000c4b7.bin
dd11d6df33ffc8d7d174ebe0da146c6b474e2dbc5ef89b973890a19bb8a3c2a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B7 5348 bytes
font_01_sfnt_off0000d6da.bin
1cd8c00f7cc10c9c96ae70cb11769ad6cd558701af2190551edfbc2bb3e09cf4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DA 10260 bytes
font_02_sfnt_off0000fa25.bin
bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA25 16312 bytes