Malicious PDF — malware analysis report

Static analysis result for SHA-256 086e091c7f5d3fdc…

MALICIOUS

PDF

65.2 KB Created: 2020-11-23 15:26:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5585421090451a1ab8e3993c4c86507 SHA-1: 7546516a30bca2c0b702e999690c86a89b647301 SHA-256: 086e091c7f5d3fdc9a6e3f48c3d2050c859478e069787c0c65bf3566c6ff3918
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to host a malicious payload or redirect to a phishing site. The document body, though heavily obfuscated, appears to be a lure related to 'I surrender chords pdf'.

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/strik?utm_term=i+surrender+chords+pdf
    • https://cdn-cms.f-static.net/uploads/4454684/normal_5faabf402353d.pdf
    • https://cdn-cms.f-static.net/uploads/4370791/normal_5f9290f033771.pdf
    • https://cdn-cms.f-static.net/uploads/4369919/normal_5fae38ddc36fe.pdf
    • https://cdn-cms.f-static.net/uploads/4406785/normal_5f9ceaff4b217.pdf
    • https://cdn-cms.f-static.net/uploads/4384144/normal_5fafc0390fc57.pdf
    • https://cdn-cms.f-static.net/uploads/4445731/normal_5f9fcf1faccbd.pdf
    • https://cdn-cms.f-static.net/uploads/4401545/normal_5faa16fa334cc.pdf
    • https://cdn-cms.f-static.net/uploads/4365542/normal_5f87e93c4286e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vatosolikijike/adobe_photoshop_cs2_shortcut_keys.pdf
    • https://s3.amazonaws.com/sojaxub/ripuka.pdf
    • https://uploads.strikinglycdn.com/files/7a9803dd-a7fe-4a06-b810-ab5466bc581a/gademaregizavofobonuwifa.pdf
    • https://uploads.strikinglycdn.com/files/bf08fba0-3f6b-47f4-b2a5-464a279973cc/41290452374.pdf
    • https://s3.amazonaws.com/didowugorokirug/15838963357.pdf
    • https://uploads.strikinglycdn.com/files/53431086-faff-4461-82e4-ef7a3fd2c3fa/billard_ball_model.pdf
    • https://uploads.strikinglycdn.com/files/31f2fd12-beb8-48e7-962b-46e22961fe03/32915680888.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_off0000c009.bin
2ef898e9e46f6738603983bf2743953996b33199678c3d5098164df45330e59f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC009 4936 bytes
font_01_sfnt_off0000d0d3.bin
b64d0574f641f09456acefe178ca98f3895cff38760b54a1d37e3af7d3869430		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D3 11724 bytes

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