Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9c4b2f0afbb798…

MALICIOUS

PDF

82.2 KB Created: 2020-12-20 14:40:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e620cad043f459b02bd737cf7cc258e5 SHA-1: d3ee1dd38365f1297e2f4ba714e383f0a2f9dfa6 SHA-256: ef9c4b2f0afbb79890b076bdd7ad8a522dbeccdf6ccfcce6a8dabc1351b1d2f4
96 Risk Score

Malware Insights

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

The PDF contains an embedded URL that points to a suspicious domain, identified by both heuristic analysis and ClamAV detection as malicious. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and unreadable, but the presence of the external URI is a strong indicator of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://traffnew.ru/strik?utm_term=brandeis+roberts+to+porter+square
    • https://cdn-cms.f-static.net/uploads/4484635/normal_5fbc061195fe9.pdf
    • https://static.s123-cdn-static.com/uploads/4446759/normal_5fdccb04ea79c.pdf
    • https://cdn-cms.f-static.net/uploads/4416500/normal_5fabdcbe44e3b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc53602abaecd33183e748b/t/5fd66bf47fc52c206925d0f0/1607887860977/yenthavaadu_gaani_movie_songs.pdf
    • https://s3.amazonaws.com/kudefem/gimaduside.pdf
    • https://uploads.strikinglycdn.com/files/60238d11-7704-4053-841f-88c638f5191d/somiritorapokegoji.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfd8672f8b574a0f39532/1606221191144/87607120430.pdf
    • https://static1.squarespace.com/static/5fc5895aec917750a3f71e5e/t/5fcd74735d2e6f3bda52265e/1607300211313/sapegiv.pdf
    • https://static1.squarespace.com/static/5fdd37888094fd3ccf307d49/t/5fdd4f0a7514fb3b762ce8b3/1608339210963/itv_2_plus_1_tv_guide.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_off00010287.bin
f7dede99ebe02c7b29b09f4dc59388cf246bb591c1eed86dc898bee3521687c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10287 5236 bytes
font_01_sfnt_off00011459.bin
e19f0cc6282a399f18dc594be3b7d1908d167e74f6ae1fc15f27979909e57317		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11459 11808 bytes

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