Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37c748bc28de665…

MALICIOUS

PDF

82.6 KB Created: 2021-07-16 14:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f0975cea63ef34d19fd6a0a664a25fc SHA-1: ec0831359284047c8324ef15686d0ac864d7beb2 SHA-256: d37c748bc28de665cbe36a2a2d00dc0ff00591b9870c24dcacd32a87827755b9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with a high risk score. It contains an embedded URI pointing to 'https://medvor.ru/square?utm_term=week+10+waiver+wire', which is a strong indicator of a phishing or malware distribution attempt. The PDF structure and embedded artifacts do not suggest a specific malware family, hence 'unknown family' is used.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8083

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://medvor.ru/square?utm_term=week+10+waiver+wire
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec8541f89f8e700bf7960b/1626113345798/vaderipetizili.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f100a074384d54fdfc11c2/1626407072351/how_to_add_bot_rythm_in_discord.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e77dc7d0c92d435c331e66/1625783751721/software_cycle_life.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8c34cf311dc752b0a38f7/1625867084700/kovadapezipojepejalibat.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f152e38cd1ac765d50c85b/1626428132374/34624371207.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_off0000e531.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE531 16792 bytes
font_01_sfnt_off0000fd43.bin
870f7a4569e11c654f17d8bbd75b41ea086099ad1aaaad6fca44e4591dcb0e9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD43 16620 bytes
font_02_sfnt_off0001289a.bin
e2ace86c05f93d31513faadf762e385b7e79419cce22944042a4e6848b7a1872		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1289A 9976 bytes

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