Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a9c9f935c22adf…

MALICIOUS

PDF

91.3 KB Created: 2021-07-13 21:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a61609c760ff4e228ec3fbc5bd8a16cc SHA-1: f5485b8f32a180130dd5a958ffbfdf17fb914287 SHA-256: 84a9c9f935c22adf8daf4a79f66d84aa418a75bf7e1d23d448878075f8b5e602
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. It contains an embedded URL pointing to 'https://catamma.ru/square?utm_term=flaws+meaning+tagalog', which is likely a phishing lure. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not a typical user-created document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5959

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://catamma.ru/square?utm_term=flaws+meaning+tagalog
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ed8873c76d6b0ba00f0c29/1626179699726/climate_of_assam_today.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8b953c0e666153b739ce8/1625864531628/kate_and_queen_elizabeth.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7b27146a8e17713e2b411/1625797233983/situbom.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ed9448d2d00a35b8cf89ff/1626182728760/meaning_of_gurgling_in_english.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_off00010509.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10509 16792 bytes
font_01_sfnt_off00011d1b.bin
ab236b495c1f21278409bb7d70e9fe655e7bf97c9a25dbece4ed4f0dc544d980		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1B 17268 bytes
font_02_sfnt_off00014a02.bin
7a718fadc3ac66052f6f569ad71192f1eef5bfd448528e830e58650b0af9658b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A02 10416 bytes

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