Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f6073068d480d4…

MALICIOUS

PDF

74.3 KB Created: 2021-07-13 03:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05206ed21a9f851590d1b85f6c756775 SHA-1: f4274301da3d63a9cb6dc3305ad0387bd92806ed SHA-256: 83f6073068d480d4fc638dafc9f4e291049aae470ec9a30cef78111acb7dae1c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded URL pointing to 'infrive.ru', which is flagged as suspicious and associated with phishing and malware distribution by ClamAV and ML classifiers. While no scripts were directly extracted, the presence of an external URI and the overall detection by security tools indicate a malicious intent to redirect the user to a potentially harmful site. The PDF structure itself shows signs of manipulation with duplicate object bodies.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7260

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=i+been+waiting+so+long+for+a+love+like+this+lyrics
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e7b07f8592fe3a588f81bb/1625796735717/3.95_kg_in_pounds_and_ounces.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e80eaa4aaab0286a8c9249/1625820842163/commonly_used_ace_inhibitors.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e822c525441e1b3788cbe1/1625825989993/dipomobotam.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_off0000c119.bin
c6479e4f9fc87418071200b87633a51b9d212b76a125645ebac740d67737885b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC119 11064 bytes
font_01_sfnt_off0000daee.bin
1c67192be8ce0b19b05a606feb5d0efb0ec501bb752316272754e033f5404c99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEE 15696 bytes
font_02_sfnt_off00010319.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10319 16792 bytes

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