Malicious PDF — malware analysis report

Static analysis result for SHA-256 99628e1582adf656…

MALICIOUS

PDF

77.5 KB Created: 2021-07-13 16:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f966249d64456244abb7d4645863542b SHA-1: 610f9daafaa506d9a3419649e8d08a78feea69c5 SHA-256: 99628e1582adf6564ea044a0182717c7a3300fcd1b7240eae88cd4b0e971ccb6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely intended to host malicious content or redirect the user to a phishing site. The document body is heavily obfuscated, preventing a detailed analysis of its specific content, but the presence of the malicious URL strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7604

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://allytemp.ru/square?utm_term=god+of+war+4+all+collectibles
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e90eab27127e68041538d8/1625886379846/not_returning_to_work_after_fmla_letter.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7e8040121f5668996be9/1626111617099/20154643323.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8465eedd67e1f12d4abbe/1625835103016/conceal_and_carry_classes.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_off0000ce97.bin
5702f83acbdf0a69c84990e0037a62c43ca6f5e401eb134669f79c2543c786ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE97 16568 bytes
font_01_sfnt_off0000f99c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF99C 16792 bytes
font_02_sfnt_off000111b3.bin
47ca6a6f73e5c34c15191fdb3d66fa59b38c28cd56be19c60f73dc291cce654b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111B3 10708 bytes

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