Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b93e7e9e63d1303…

MALICIOUS

PDF

64.9 KB Created: 2020-11-18 09:05:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c46075d3edf1d742573d865923710106 SHA-1: 977863cdc9a46963ab5c52519deeb7264f9f7c32 SHA-256: 4b93e7e9e63d1303d64e2d2445a334bba39d566a147aca8b01c76d636a06b102
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URL pointing to a suspicious domain, likely intended to trick the user into downloading further malicious content or visiting a phishing site. The document body, though heavily obfuscated, suggests a lure related to study guides.

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://trafffe.ru/123?utm_term=powerpoint+study+guide+template
    • https://cdn-cms.f-static.net/uploads/4422628/normal_5f9acccc3ffce.pdf
    • https://cdn-cms.f-static.net/uploads/4481278/normal_5faf98ffddb70.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nitidadufetenu/red_car_2015_pinot_noir.pdf
    • https://s3.amazonaws.com/xidulumexi/dayz_guide_crafting.pdf
    • https://s3.amazonaws.com/bevarolimesale/posugusoten.pdf
    • https://s3.amazonaws.com/kulinisokakewi/uneven_distribution_definition.pdf
    • https://s3.amazonaws.com/mafavuzenoliki/2119706020.pdf
    • https://uploads.strikinglycdn.com/files/650fceb1-42b1-4060-b0ce-4ce3dec86932/shoot_hoops_meaning.pdf
    • https://uploads.strikinglycdn.com/files/304a72e8-38b3-457b-997f-f694eb6ab781/rimixuzijara.pdf
    • https://s3.amazonaws.com/fosagoba/western_shootout_usafa.pdf
    • https://uploads.strikinglycdn.com/files/a0f5cca6-8bf6-440a-b354-8ce0ff9cd874/vedizexoranuguxovumosa.pdf
    • https://s3.amazonaws.com/zetare/feruzuviletezisupula.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_off0000c2f4.bin
82dbcb69820fecdfee908920fcf506517cfcaf2447df1cbeac44295a3dfc70fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F4 5476 bytes
font_01_sfnt_off0000d593.bin
4ec84f6e159eaa044bd0551100838e6f81af8e221789f8878752c0690ef76775		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD593 9772 bytes

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