Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9d8045e5c27c0c…

MALICIOUS

PDF

74.7 KB Created: 2021-07-13 21:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90895b2ee3e3a98e85397b8413830e2f SHA-1: 6487ed443d120c5a5a5fe88af80c67c8afddefe9 SHA-256: bc9d8045e5c27c0c7ad90b3a0895ae2e1f5df53c850b6604859c425ecb6fc663
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. An external URI was found embedded within the document, pointing to a suspicious domain. This suggests the document is designed to trick the user into visiting a malicious website, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8907

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://krisoc.ru/square?utm_term=shapes+with+reflection+symmetry
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e922742c5c2f6215c90c06/1625891444784/hollywood_park_by_mikel_jollett.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e9440a18245d33f182cde6/1625900042108/dave_hells_kitchen_now.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ed9a38cd5f69124b40ca99/1626184248600/the_lord_will_beautify_the_meek_with_salvation.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e91e6d3ba7d954d5461678/1625890413808/wuninej.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e9403a0cbdad4d3506cad8/1625899066918/black_beauty_story_questions_and_answers.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e95c593ba7d954d547d9af/1625906265441/67954252513.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_off0000c1aa.bin
ada6a8afea93ab49c2c87d2b694e31c22692ad13afa0d08e644eda7ebcf913a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AA 16696 bytes
font_01_sfnt_off0000ed21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED21 16792 bytes
font_02_sfnt_off00010538.bin
b08727975d79b66e466cff9baad1c8177c7ea8f6e0119d7bfb8081e7d813e667		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10538 11020 bytes

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