Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb9d8c56450c8a4…

MALICIOUS

PDF

63.4 KB Created: 2020-11-12 15:49:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 064f9ea1dcc44ce9d51728b127e28dff SHA-1: 9f42343ab20ecc7ee681a917a085e3fabaf6bfd8 SHA-256: 4cb9d8c56450c8a4aacee087357d1a6f01ddcc647155bf4573362e995717343b
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'traffset.ru', which is a strong indicator of a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text fragments that may be part of a lure.

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://traffset.ru/123?utm_term=words+start+with+yu
    • https://cdn-cms.f-static.net/uploads/4467950/normal_5fad2e15076f3.pdf
    • https://cdn-cms.f-static.net/uploads/4459805/normal_5fa86e45f19a8.pdf
    • https://cdn-cms.f-static.net/uploads/4366048/normal_5f91e3d9abaf8.pdf
    • https://cdn-cms.f-static.net/uploads/4372384/normal_5f9506bf23af8.pdf
    • https://cdn-cms.f-static.net/uploads/4375694/normal_5f948c2e2395a.pdf
    • https://cdn-cms.f-static.net/uploads/4392457/normal_5fa6114c786c2.pdf
    • https://cdn-cms.f-static.net/uploads/4369331/normal_5f8c552d67f03.pdf
    • https://cdn-cms.f-static.net/uploads/4374953/normal_5f91ac30e85f5.pdf
    • https://cdn-cms.f-static.net/uploads/4413016/normal_5f9b041a8b8ba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e032375b-d553-47bb-b793-889a82a43070/34064638619.pdf
    • https://uploads.strikinglycdn.com/files/56c69a1d-aff2-4069-9163-4dc6524d09d0/makeup_class_worksheets.pdf
    • https://uploads.strikinglycdn.com/files/f6761e54-c782-405a-a755-96f497d12e16/70687742674.pdf
    • https://uploads.strikinglycdn.com/files/df925132-c1db-4b60-ba4a-335b45c86c8e/ponimavovinekifuminarug.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_off0000ba4b.bin
c50ef95271dba6aef35dc4480731e64ebfd0e39917c43f26e49ab4f598494141		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA4B 5088 bytes
font_01_sfnt_off0000cbab.bin
bf9c874b9f74767e39fcbcc017ba9456f762503380fd7cb548419e8224b382ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAB 11244 bytes

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