Malicious PDF — malware analysis report

Static analysis result for SHA-256 d243acb876ec651f…

MALICIOUS

PDF

60.4 KB Created: 2020-11-30 20:50:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc8449a38fd226d8d1da28a3b11133e4 SHA-1: dec1df70108e7f3d9db4e925f76ebf5184b62dcb SHA-256: d243acb876ec651f4c10aad53775208d214457fcad1475488cdd6aae9f376936
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'trafftec.ru', which is likely used to deliver a secondary payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to educational worksheets.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=solving+rational+equations+and+inequalities+worksheet+kuta
    • https://cdn-cms.f-static.net/uploads/4379969/normal_5f8cbc64896c3.pdf
    • https://cdn-cms.f-static.net/uploads/4407318/normal_5f936d0b28a8c.pdf
    • https://pidofuvu.weebly.com/uploads/1/3/0/7/130739764/9913158.pdf
    • https://cdn-cms.f-static.net/uploads/4368506/normal_5f92859c2de34.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wexoteluwag/98992201535.pdf
    • https://s3.amazonaws.com/leguvefu/70144407350.pdf
    • https://s3.amazonaws.com/mavixu/4469787023.pdf
    • https://s3.amazonaws.com/ziwuvijevo/2011_acura_mdx_reviews_consumer_reports.pdf
    • https://s3.amazonaws.com/wajufifenoxuj/funebovakibosuninevug.pdf
    • https://s3.amazonaws.com/tupofelasujewas/virulemutigad.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4cad3570fb44d1f90f9b/1606372526057/shark_navigator_lift_away_manual_nv351.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_off0000adb9.bin
3a290cbd51c884aec2c3b4edec0489d7eb607bd1b5d80b4fab27dd40d681a78b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADB9 5532 bytes
font_01_sfnt_off0000c08e.bin
467f27caf1a453ceddf8888eae127e883835fe50d7322f1bf04d65057003263a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC08E 10616 bytes

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