Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4200cd78cbeb12…

MALICIOUS

PDF

86.5 KB Created: 2021-07-13 22:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f223cdebb425b5aa21ec5a7f3a20debb SHA-1: 1e7d8cceef6edef774efae7f4f0c60f1c631ec86 SHA-256: 8d4200cd78cbeb12d9a855a88840fd488460c1aad4b96b2777814fb7495f7fd3
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan. A PDF heuristic identified an external URI pointing to 'infrive.ru', which is likely a phishing domain. The document body was heavily obfuscated, preventing a detailed analysis of its specific content, but the presence of an external URI and the ClamAV detection strongly suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.1769

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://infrive.ru/square?utm_term=list+of+isomers
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ede24cad58ca03d2275aec/1626202700293/tropical_seasonal_forest_climate.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_off0000f19d.bin
4e2ba03861eda948ab7133ef8ef5511a9c1f86f8054474205c573e45fc6d85d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF19D 17800 bytes
font_01_sfnt_off00012061.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12061 16792 bytes
font_02_sfnt_off00013878.bin
3e02c46f9a5c1c81cd73320b1659df1b90d83b33a68eea9ef8f942eff30eb2cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13878 10020 bytes

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