Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5cb6dd9b59d4ae…

MALICIOUS

PDF

77.4 KB Created: 2021-07-12 22:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1cba2d88c89a5f3b88f5615153138469 SHA-1: f85b518eccf169397179babef7fe4b201b3b0401 SHA-256: 9d5cb6dd9b59d4aedb1563877d6e606f07f8475b4344a8e55016406d599d0206
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a phishing and trojan detection. The embedded URL, disguised as a Minecraft skins search result, likely leads to a phishing site. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristic suggest an attempt to redirect the user, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier clean score 0.2489

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://feedproxy.google.com/~r/sq/ugae/~3/J-SxIuB37Ms/square?utm_term=minecraft+skins+pictures+girl
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e94076085b1c120f992e13/1625899126866/essentials_of_mis_12th_edition.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8cad63e172817b39cc1f8/1625869014927/43837532738.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_off0000cb7a.bin
1297484e1c6ab0fce9fdc26a2e0ad9f908b86527ac12b2bd7aa62764cbde256c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7A 17380 bytes
font_01_sfnt_off0000f922.bin
aedb7db69444a66dac71db6d4410a12eafafea7d6ca0a736cd1978b76751363a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF922 10720 bytes
font_02_sfnt_off000111e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111E9 16792 bytes

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