Malicious PDF — malware analysis report

Static analysis result for SHA-256 24bb3bf5083ddfd0…

MALICIOUS

PDF

79.2 KB Created: 2021-07-15 21:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 099d474932aec9c2c23fa71d1b8185d8 SHA-1: a11a322aedcc9a39bfa0c7ae5d1273841d1869cc SHA-256: 24bb3bf5083ddfd08683c21f6d4328150844a3a980f2aa62d3355092cbd39ddb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with a critical heuristic firing for ClamAV detection. An external URI heuristic points to a suspicious URL, 'https://drafthe.ru/square?utm_term=largest+continent+by+area', which is likely used for phishing or to host a secondary payload. The PDF structure and embedded content suggest it's designed to trick users into visiting this external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9031

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://drafthe.ru/square?utm_term=largest+continent+by+area
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60eca2e458d864752e040b07/1626120932577/66842627787.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60edf4ee24c32e4364b6d0aa/1626207470784/black_choral_composers.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60edfe213e011143712b9de6/1626209825464/current_power_outages_near_me.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee03854ff81d3e28182d9b/1626211205581/are_we_supposed_to_meaning.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e81dd038ed220952b0536f/1625824720635/wulesebo.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec810a72e2584f24631728/1626112266655/peboneluxofip.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e93da18fb24157da710792/1625898401313/21655028643.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_off0000d695.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD695 16792 bytes
font_01_sfnt_off0000eea7.bin
c1703f7b2b67d0a91e7ebde3e0cbcddad004ecf4a06f1583478efce39eeee139		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA7 16288 bytes
font_02_sfnt_off000118cb.bin
1ed2814f7404daef777e0479834b5fa93d0efb586e9057a35a15d3b6a8b00e2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118CB 10568 bytes

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