Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b91b2eff649ceae…

MALICIOUS

PDF

75.5 KB Created: 2020-11-22 17:09:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfc579d93ae26841365b4547e41fef68 SHA-1: 1e8b1b39ba1f020f6c798b168a70f262f573d31e SHA-256: 5b91b2eff649ceaebdfd2337eba8a1f176130a1c7e83a2e663931e6ea18afa32
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to 'traffset.ru', which is flagged as malicious by heuristics and ClamAV. The ML classifier also strongly indicates maliciousness. While no explicit script was found, the presence of an external URI in a malicious PDF strongly suggests it's intended to redirect the user to a harmful site, likely for phishing or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/123?utm_term=group+6+elements+reactivity
    • https://cdn-cms.f-static.net/uploads/4416493/normal_5f9e9f4f12fb0.pdf
    • https://cdn-cms.f-static.net/uploads/4369657/normal_5f87ec1bdee2c.pdf
    • https://cdn-cms.f-static.net/uploads/4390681/normal_5fa3acc81a724.pdf
    • https://cdn-cms.f-static.net/uploads/4492259/normal_5fa99d071841b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zuxadol/bugejujebi.pdf
    • https://s3.amazonaws.com/jaloto/78271644469.pdf
    • https://uploads.strikinglycdn.com/files/0ca21059-c0b9-49ab-83d3-85a69b268bb1/zakugapesavel.pdf
    • https://uploads.strikinglycdn.com/files/db364a43-d9ef-423f-ad6b-8c74d466e195/a_bblia_do_tarot_completo.pdf
    • https://uploads.strikinglycdn.com/files/5b914cb8-9453-47c8-8549-1c7e79caca41/kukepumezuxexokux.pdf
    • https://s3.amazonaws.com/xefejevife/kivakuwuzezaw.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_off0000e5d9.bin
47207e27530e69b09c646cbfd9e4351e9bf3bf315e67ad2c454cc135ee1dc32f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D9 5428 bytes
font_01_sfnt_off0000f847.bin
08e03ea152302cebe09f0c32645054e33013a170ecc0e80f1064680d1b98ea83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF847 12596 bytes

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