Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec0ca8005c1eb67c…

MALICIOUS

PDF

81.6 KB Created: 2021-07-12 21:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd2a5e4dcc3824a90e36d100382ec4a2 SHA-1: 8f48478df080fe11816c8fdfd512b1d899e3d2ef SHA-256: ec0ca8005c1eb67cbfdb3957e151f2de69739c38a23960b9b2b770542a81909a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. An external URI pointing to 'synerhu.ru' was extracted, suggesting a phishing attempt. While no scripts were directly extracted, the PDF structure and embedded URI are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5817

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://synerhu.ru/square?utm_term=electronic+devices+floyd+pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec7aa3d0153e73bf8aef83/1626110627148/91123657114.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8c7e8d7702a4b9a6f9b5c/1625868264910/56777447681.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8d240c158db2a32daa638/1625870912171/balofi.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8f29258c6623f037fe478/1625879187129/81220557726.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_off0000dd1b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1B 16792 bytes
font_01_sfnt_off0000f532.bin
62423026d084d0f231acedf0a5b230ec143a277630ac169fe5f0c795addd7823		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF532 10612 bytes
font_02_sfnt_off00010d97.bin
808e937785183f91063bc4154db467777ff0798866809635ce0c30c03b19292a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D97 17464 bytes

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