Malicious PDF — malware analysis report

Static analysis result for SHA-256 e631f8e7cf39009b…

MALICIOUS

PDF

66.4 KB Created: 2020-11-21 06:12:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbd73c9714cb253593817c8306c09993 SHA-1: 98e64a85bbc919e67c0798c0d47a4375d6af2cb3 SHA-256: e631f8e7cf39009b5f76a98d982967308a22703135be6ede71f7df9b0c0871ae
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it uses a social engineering lure to trick the user into installing a browser extension or update. The embedded URL 'https://trafffi.ru/123?utm_term=algebra+textbook+pdf' is likely part of this lure, aiming to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://trafffi.ru/123?utm_term=algebra+textbook+pdf
    • https://cdn-cms.f-static.net/uploads/4370764/normal_5f8f200e9ecad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/goneduzum/induction_of_labour_guidelines_uk.pdf
    • https://uploads.strikinglycdn.com/files/d144e343-d109-40f8-84bd-2c6589e369fb/budget_wireless_headphones.pdf
    • https://s3.amazonaws.com/vikukinumet/basic_concepts_of_computer_architecture.pdf
    • https://uploads.strikinglycdn.com/files/61be8f4d-361c-4648-aec6-5710aa8575db/95140075426.pdf
    • https://s3.amazonaws.com/bulalowisu/melim.pdf
    • https://s3.amazonaws.com/gozilum/sky_rover_helicopter.pdf
    • https://s3.amazonaws.com/varoximu/4337711490.pdf
    • https://s3.amazonaws.com/gofilafixu/tagalog_worship_songs_lyrics_and_chords.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_off0000ca2e.bin
1c288fea1ddb4bc9519175de1eabf26dd2a71c808a2ac21f23d62acbde43eb8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2E 5292 bytes
font_01_sfnt_off0000dc3f.bin
d3918bbad7df5ea6293a814566261342e49d2a4dc95e8cf1b1cec1370926c338		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3F 9572 bytes

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