Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5678763e9d6ee70…

MALICIOUS

PDF

77.7 KB Created: 2021-07-13 19:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9b952c794adaed43217127778136e77 SHA-1: 337eb6dbff62144caa57e790a7b86c0f803669c6 SHA-256: c5678763e9d6ee70be56d588bb7842ab10858a81ac53458bce1e65609de6b25c
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV. It contains an embedded URL that points to a PDF file, suggesting a multi-stage attack or a lure. The PDF structure itself is also noted as having duplicate objects, which can sometimes be used to evade detection. No scripts were extracted, but the presence of an embedded URI and the ClamAV detection strongly indicate a malicious intent, likely phishing.

Machine Learning

  • Nyx PDF Classifier clean score 0.2210

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://feedproxy.google.com/~r/sq/ugae/~3/CcIy6vlvkUk/square?utm_term=nv+energy+power+outage
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e952c283ae0c49023a9377/1625903810738/gafevesufagubuwolodigir.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8c9129ffc3426e8a4b36f/1625868562409/report_sample_for_students.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_off0000d0e0.bin
874f53a9513b2c045465d0c7254f2d47701098d9c0e51caeab9f44ca203b4278		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E0 16420 bytes
font_01_sfnt_off0000fb75.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB75 16792 bytes
font_02_sfnt_off0001138c.bin
183963e55b464adf72661ffaeaef2dc0938aad69ba94f874231fb572e35cb18d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1138C 10464 bytes

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