Malicious PDF — malware analysis report

Static analysis result for SHA-256 07b8781a61c2700b…

MALICIOUS

PDF

76.9 KB Created: 2021-07-13 20:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b9a5018d4d032416aa9228321dacc10 SHA-1: eedb6de6de088ea32f8a5ae7d34565748918c60f SHA-256: 07b8781a61c2700b2c339100f3864f488b33959b617b13f7d83b42feba6e7fad
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded URI pointing to a suspicious domain, identified by ClamAV as a phishing trojan. The document body is heavily obfuscated, but the presence of the external URI strongly suggests a phishing attempt to redirect the user to a malicious site. No scripts were extracted, but the PDF structure itself facilitated the embedding of the malicious link.

Machine Learning

  • Nyx PDF Classifier clean score 0.2210

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://coretry.ru/square?utm_term=tom+wright+playwright
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e7a732afd06e4982e7ad17/1625794354272/56921090616.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e95f7ef492d21a0f6ca885/1625907070433/18591374968.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_off0000ce4a.bin
32c7fcaf4f3445ae1cdbcb81261a81e665f78f7697f1a959d5bf334d1dcd9709		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4A 16272 bytes
font_01_sfnt_off0000f854.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF854 16792 bytes
font_02_sfnt_off0001106b.bin
83f502c5df44ec858cb163b3fcc9f5d99592d10b02939efc7d3389e76213ab3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1106B 10456 bytes

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