Malicious PDF — malware analysis report

Static analysis result for SHA-256 a187dfae7926e4a5…

MALICIOUS

PDF

81.2 KB Created: 2021-07-14 07:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4540af0b2aa9fa03da0b9cd50fdc513b SHA-1: 0ee43b1967cfe9d2d69af42237d3934d1c125a4b SHA-256: a187dfae7926e4a5b2dc161bb0b072bb5955a602c0cd3650365b641947ae7dc1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating the presence of an embedded external URI. Although the document body is heavily obfuscated and unreadable, the PDF_URI heuristic suggests an attempt to redirect the user to a potentially malicious URL. The presence of embedded fonts and the wkhtmltopdf authoring application are noted, but the primary threat appears to be the embedded URI.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6665

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://feedproxy.google.com/~r/sq/ugae/~3/r_nBws6J8g8/square?utm_term=solve+and+graph+the+inequalities+worksheet+answer+key
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8b5897259ea1c2eb036dd/1625863561899/standard_conditions_of_sale_3rd_edition.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ed01d7c1f2f619459ea17d/1626145239840/35049358831.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e771a13bc03b46d747c82a/1625780641545/37887423633.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_off0000d78f.bin
e2086a5df9a27f1b1c289a3059de7c698f7900d194a8e6783bd0ac2d774fa7f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD78F 17236 bytes
font_01_sfnt_off000104ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104BA 16792 bytes
font_02_sfnt_off00011cd1.bin
ae5ff90827d06ad53056ff5c8273d90563e875b69dfa6e9ed8d56e508dad11d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD1 11352 bytes

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