Malicious PDF — malware analysis report

Static analysis result for SHA-256 931b27a377ae90a3…

MALICIOUS

PDF

75.0 KB Created: 2021-07-13 20:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6c71ac695462b31763c215df6fba2182 SHA-1: 7cf76ca657bfc1c05310dae5409cd6fa9bfb42fa SHA-256: 931b27a377ae90a34c10c13338f7ca14924e8f11ca0c35207de1dbad9dbad103
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. It contains an embedded URI pointing to 'https://krisoc.ru/square?utm_term=memorial+day+meaning+in+english', which is likely a phishing lure. The PDF structure itself does not contain readable content, but the presence of the malicious URI and the ClamAV signature strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier clean score 0.2156

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://krisoc.ru/square?utm_term=memorial+day+meaning+in+english PDF link annotation
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60edaad1881afe0f0ced162f/1626188499324/monoleledefuxupegeb.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC389 10704 bytes
SHA-256: e52f8c397e44a1b291631d81f3cf1e765cc9852d414181dbc016b94031475f5e
font_01_sfnt_off0000db9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AC 16620 bytes
SHA-256: 8fc05361e223eb5c84c6e120b9533b659c9ca6b45cd0d11cc097045332319b4b

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