Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff481758aeea6d6d…

MALICIOUS

PDF

84.4 KB Created: 2021-07-20 22:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c514716bb948bb2ba958a8a3080bc44a SHA-1: 71ad303fa40ef954c398752605f6b14abdf6f640 SHA-256: ff481758aeea6d6d02d7c02ca10051316f226664af522786230ad0bcbfdbd005
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 specific detection name indicating it's a phishing trojan. The PDF contains an embedded URI pointing to a suspicious URL, which is a common tactic for phishing or directing users to malicious content. While no scripts were directly extracted, the presence of embedded URLs and the ML classification strongly suggest a malicious intent, likely related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8083

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://feedproxy.google.com/~r/razvivatel/yapz/~3/nCRFBnYrBHY/square?utm_term=what+is+the+formula+for+the+speed+of+a+wave
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60edd5511c6c1a61d5241d5c/1626199377726/86765223972.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edae8d8b6fd7287616eb81/1626189453443/47118605331.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec86b40d838b6c850d4228/1626113716413/wusapusojajat.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec7d9940121f5668995664/1626111386266/kieso_chapter_21_solutions.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f70967ee3bf21e6ae315bf/1626802535998/11646784745.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_off0000e550.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE550 16792 bytes
font_01_sfnt_off0000fd67.bin
7a491e860e310af81214d2151d614436e83c6547799eaa776742b7603f8f03c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD67 10904 bytes
font_02_sfnt_off000116b5.bin
9836119d9c84c585d82509b973da3daad195901e819020e038a435bc17922887		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116B5 17720 bytes

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