Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f0a4a3f530e562…

MALICIOUS

PDF

80.1 KB Created: 2021-07-21 13:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 260f4ce109a627ad65544ca4bd663dce SHA-1: 68a743342d4a05875cdd1055fa51e4c44880b74b SHA-256: f6f0a4a3f530e562df0cd2206086dba2d03dddafe891848ba474b6dac71294f1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF with a high ML classifier score and ClamAV detection indicating maliciousness. It contains an embedded URI pointing to 'https://archism.ru/square?utm_term=interest+rate+yield+curve', which is likely a phishing or malware distribution URL. The PDF structure and embedded content suggest it is designed to exploit vulnerabilities or trick users into visiting the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8298

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://archism.ru/square?utm_term=interest+rate+yield+curve
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f7496d5f4087440773a1db/1626818925901/discord_countdown_timer.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f1752f8bcf896c91624fcc/1626436911800/befiwofilexami.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7d67ff9c8b53cea1cfed/1626111335238/mp3_music_player_online.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8cfe9644c9b4de7f2b655/1625870313274/epic_7_best_way_to_farm_gold.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e91a12f229ba2ea836c548/1625889298888/christmas_themed_quiz_questions_and_answers.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db44.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB44 16792 bytes
font_01_sfnt_off0000f356.bin
d192bc1beef5409538219e0d2f514b2f550be6b9a88aafbad40f12c26309764c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF356 16128 bytes
font_02_sfnt_off00011d0f.bin
6c1e7023fbe4ac379b792ea0f2a751464d2dfd3dad53efd233fb8c291ba51836		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0F 10476 bytes

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