Malicious PDF — malware analysis report

Static analysis result for SHA-256 b257477ac50d19c4…

MALICIOUS

PDF

147.5 KB Created: 2021-07-13 21:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f934a66d743f84d4b623e06341ea6a7c SHA-1: f82b8e448e132753a62fc1e03f036f0cca77d674 SHA-256: b257477ac50d19c49e3fdfb53221b2b4eb388470ad51c34a93900849dc9323cb
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. It contains an embedded URI pointing to a suspicious domain, 'drafthe.ru', which is likely used to host a phishing page or a second-stage payload. The PDF structure itself does not contain readable content, but the presence of the malicious URI strongly suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3803

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://drafthe.ru/square?utm_term=up+polytechnic+result+2020+group+a
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60edcb7ac450ee47307cbe46/1626196858642/days_of_the_week_lesson_plan.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed9135b1b13d3c3c134ad2/1626181941783/wolf_school_gear_the_witcher_3.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e7c0b9ce8457037ee15695/1625800889149/october_rust_type_o_negative.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_off0001e2ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E2BA 16792 bytes
font_01_sfnt_off0001facc.bin
5a09e0c549ba323130a7914d9cfaea018be0e683b6cac9e6a0c7a083a58013af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FACC 17256 bytes
font_02_sfnt_off000227f2.bin
d8d6f187a1b4959fe1d708371e0e3548d72f552b6d055b181cf98ad243f36314		 pdf-font-stream PDF embedded font (sfnt) at offset 0x227F2 11116 bytes

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