Malicious PDF — malware analysis report

Static analysis result for SHA-256 45d349a8e11037ba…

MALICIOUS

PDF

78.3 KB Created: 2021-07-16 00:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5890535b603cf44d06a11e5adfee8dab SHA-1: 5e07b5d665f3e3fa45aacc5061107accbcd89b1a SHA-256: 45d349a8e11037ba935dea9d007c1303ba1e3ef47bd5cff4aae89a157363b1ff
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'synerhu.ru', which is likely a phishing or malware distribution site. The file's metadata indicates it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, suggesting it might be a crafted lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8374

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/square?utm_term=4+pics+1+word+482+answer
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e942cfb67368755968c426/1625899727398/92503276231.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e835b85c1b846003427a1b/1625830840764/book_of_the_dun_cow.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f0a327ed8b8a523b8b63a4/1626383144103/chicago_pd_jay.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f0a1ebcee2791ff980a579/1626382827692/henrico_county_fire_department.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee412933d4654651bdb8c7/1626226985657/81363895681.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_off0000d16a.bin
3521acee3a91f6bed3ede719886b1a70edb5805b864ea189060cf1e969276215		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD16A 10808 bytes
font_01_sfnt_off0000ea9f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9F 16792 bytes
font_02_sfnt_off000102b1.bin
f773169fbac1707edc67b83a9fa58f77c6f2a4cd11cfdae00d584d309cc395b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102B1 16588 bytes

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