Malicious PDF — malware analysis report

Static analysis result for SHA-256 3163978e6516c7b1…

MALICIOUS

PDF

86.2 KB Created: 2021-07-14 03:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 74b1f197b88134958153936af3d715c3 SHA-1: 5a83ba0f36f622e6399610cd567534e2ae122041 SHA-256: 3163978e6516c7b1c6f46b5bb82c8299cb7faaa58584877629fdf69fbe05f6d4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'https://nomylo.ru/square?utm_term=kyphotic+curvature+of+the+cervical+spine', which is likely used for phishing or to download a secondary payload. The PDF structure and embedded content suggest it is designed to appear as a legitimate document to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8790

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://nomylo.ru/square?utm_term=kyphotic+curvature+of+the+cervical+spine
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec7a80fd54eb070824e37f/1626110592966/50968047847.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e923432dabf27235547288/1625891651911/rujutigel.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee24be588fb56695129d14/1626219710522/49657824385.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7b6a7a431ed42d2fa005e/1625798311385/95847831560.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60edd352670c344ea75bdf47/1626198866390/one_day_at_a_time_watch_online_season_4.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60edb94d5d4dee687f4b8b46/1626192205663/tipipudezoxexixa.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e94de4563c1506a8b7861d/1625902565058/warhammer_scythes_of_the_emperor.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_off0000ef4e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4E 16792 bytes
font_01_sfnt_off00010765.bin
0c07d81f8066410dc7ec9472ce6ce9163078938281d9ca0c80eacfeccbf0b31c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10765 10848 bytes
font_02_sfnt_off00012075.bin
83f9f8aeae867793d6e3b262aba571687a03f99781a5c7e3b336c66de2250376		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12075 17044 bytes

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