Malicious PDF — malware analysis report

Static analysis result for SHA-256 95b8d3e1a9b315ee…

MALICIOUS

PDF

76.6 KB Created: 2021-07-14 03:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d32974aa6392c526e83c3af795e2dc9 SHA-1: dc3c1183b7dbaaa118b3ebd832e631ee5a538aa0 SHA-256: 95b8d3e1a9b315ee7b7d240e708531eb29ca48cf9f2f00bcad6b803f5e9f76b3
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, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://medvor.ru/square?utm_term=different+categories+of+art', which is likely used for phishing or to download a secondary payload. No scripts were extracted, but the presence of the malicious URL and the overall detection suggest a phishing attack delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8715

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://medvor.ru/square?utm_term=different+categories+of+art
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee18702485902f3e708d02/1626216560609/hybridization_of_central_atom_in_xef4.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e94b1fc0906550d90c867b/1625901855151/88110286868.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e7e08c38ed220952ade4ff/1625809036946/spinach_cheese_souffle.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ede5feba7c7f743c1df5d3/1626203647091/38437850234.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e7770400780223f09d31c9/1625782020341/dynamic_host_configuration_protocol.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_off0000cea0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA0 16792 bytes
font_01_sfnt_off0000e6b7.bin
559d1f462a3670fb60b445faf6396c8be9c3f916fec95e8f059a81f6b7e0f35b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B7 10468 bytes
font_02_sfnt_off0000fea5.bin
e5e101038b2f5ea280c56862bbca4824daa24e6c65a92abf75d813793b506f8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA5 15336 bytes

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