Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5de53b733a1b80…

MALICIOUS

PDF

65.8 KB Created: 2020-11-14 11:02:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0237ba59aa478004b075df68f90c165 SHA-1: cc3d4fbb116a49a4dc0c0ce1ccb5d26f061e08bf SHA-256: cb5de53b733a1b8031f0fddea95fed2f74d8498de50e9437c1a9c7720dcdbd37
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL 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, appears to reference 'Visual studio code format java', suggesting a lure related to software development.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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/aws?utm_term=visual+studio+code+format+java
    • https://zavomafig.weebly.com/uploads/1/3/4/3/134356936/30697e61f5.pdf
    • https://wujavafosa.weebly.com/uploads/1/3/4/7/134714043/4017407.pdf
    • https://cdn-cms.f-static.net/uploads/4379029/normal_5f9097d8245fa.pdf
    • https://cdn-cms.f-static.net/uploads/4369160/normal_5f9aba2f912c5.pdf
    • https://cdn-cms.f-static.net/uploads/4381105/normal_5f8dfa14ab851.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/87cb9d61-abc6-4060-a6fe-3fd9dd2bb7d6/buvenewolujatubij.pdf
    • https://s3.amazonaws.com/xarojapi/bridge_to_terabithia_script.pdf
    • https://uploads.strikinglycdn.com/files/f9209660-46bf-463c-8be6-3e2b8d3d0448/crane_pedal_exerciser_5576.pdf
    • https://uploads.strikinglycdn.com/files/c63c8d9a-ebde-410a-bf4a-fa74f4ca117e/64491514016.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_off0000c40d.bin
161dd8d599bc9df45f146278edc25f261064b34d94ee59598add570ec56e5c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC40D 5268 bytes
font_01_sfnt_off0000d5f0.bin
ee9dcf8d1893628a20773c2cb5c17af347d66484c004462eaf4c17e93e99a954		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F0 10688 bytes

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