Malicious PDF — malware analysis report

Static analysis result for SHA-256 5915133a24171bbb…

MALICIOUS

PDF

76.6 KB Created: 2021-07-20 18:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a423fdee6c71b2d06298cb6735c6a09 SHA-1: c7981733691f06e7028875eaf8274f3a46c5d93d SHA-256: 5915133a24171bbb59b5d114f7dceef907da80da20ae6e996a19d1dac16a8ca9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains embedded URLs that point to external resources, suggesting it's designed to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9163

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://feedproxy.google.com/~r/sq/ugae/~3/5VO7y1TeAqQ/square?utm_term=be+your+own+kind+of+beautiful+meaning
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f094d5b80f1f2a7e64b439/1626379477858/72970158394.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60efcb0949582827e2fb8991/1626327817935/control_systems_engineering_by_norman_s_nise_solution_manual.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ecbc94929f7b3a9fe08e32/1626127508597/rofutidolasufigato.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f06f4049bf6a548c8662f8/1626369856235/iron_man_android_game_apk.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec9116f83a7f26ecd1a44e/1626116374261/how_to_save_imovie_on_mac_as_mp4.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f5a08001d75d08bd611a19/1626710144983/quadratic_equation_notes_for_iit_jee.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e7a22c5c1b8460033bb592/1625793069108/coastal_meaning_in_english.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_off0000c9c4.bin
b6a3bf2cee65679ec05a34c77a653f7e4c1cfe145d547fd45400e46eee6d3825		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C4 16516 bytes
font_01_sfnt_off0000f472.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF472 16792 bytes
font_02_sfnt_off00010c89.bin
6232f664b67bb3765addf71fe1b557bdb338bb42511362aaaa6c687587313afe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C89 11116 bytes

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