Malicious PDF — malware analysis report

Static analysis result for SHA-256 968dad4b5ef1cd27…

MALICIOUS

PDF

74.9 KB Created: 2020-11-20 12:14:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98c29b5789829cda8284c1783e75e514 SHA-1: 1bb28f2f8c12d13f10fe1c82e350c8e475a358cb SHA-256: 968dad4b5ef1cd27143a7ba75dc45a8450b586e8838266a8f25240dff0667fe7
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'trafffe.ru', which is a strong indicator of a phishing or malware distribution attempt. The document body is heavily obfuscated, but the presence of the external URI is the primary driver for the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://trafffe.ru/strik?utm_term=rehabilitated+military+or+nkvd+prima
    • https://cdn-cms.f-static.net/uploads/4366045/normal_5f8aa6bae6a09.pdf
    • https://cdn-cms.f-static.net/uploads/4375206/normal_5f8b304e30c97.pdf
    • https://cdn-cms.f-static.net/uploads/4501794/normal_5faefd0d727b1.pdf
    • https://cdn-cms.f-static.net/uploads/4456122/normal_5fa29712f2078.pdf
    • https://cdn-cms.f-static.net/uploads/4369332/normal_5f920c168c581.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/leguvefu/dosiguboji.pdf
    • https://uploads.strikinglycdn.com/files/d0201127-d272-41f9-b402-f0834f01962b/vewivumixaluxojade.pdf
    • https://uploads.strikinglycdn.com/files/4b76a7ed-93af-4664-98f0-96c8190189e9/letter_of_complaint_useful_phrases.pdf
    • https://s3.amazonaws.com/bejideba/lasermax_guide_rod_glock_17.pdf
    • https://s3.amazonaws.com/juxatop/alex_rider_never_say_die_free_online.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db13.bin
acb3a89e895cabd2497cc144c1cb5759bfcac8247cc42f6c02baa83456144b7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB13 5180 bytes
font_01_sfnt_off0000ec8a.bin
9ec5d68eb385cdc8746231e1986bb7ca9bdb235d9530b29ad19b56832ea033c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8A 10576 bytes
font_02_sfnt_off000110aa.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110AA 4324 bytes

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