Malicious PDF — malware analysis report

Static analysis result for SHA-256 d639f33cfc58c576…

MALICIOUS

PDF

80.2 KB Created: 2021-07-13 19:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f0525656d47ef4b670363e436e804f6 SHA-1: a73b36c063f641df12fd24eaa920108e45ed9d59 SHA-256: d639f33cfc58c57691868d41fcec06921e9b0d79268d5b55be81a9a90174ef65
66 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan, indicating malicious intent. The PDF structure shows evidence of duplicate object bodies, which can sometimes be used in exploit techniques. While no scripts were extracted, the presence of embedded URIs and the ClamAV signature suggest the file is designed to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier clean score 0.1630

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/v-xubMviL4Y/square?utm_term=how+much+is+128+oz+of+water+in+gallons
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ed9009bde79631d3412c15/1626181641472/bill_dance_outtakes.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_off0000d614.bin
54352142173c8021097a83cb7b3729b0f613376bdd0d759e55483f6b71905a40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD614 11400 bytes
font_01_sfnt_off0000f0fa.bin
f1b24887b6d7e2852842311dee1e932ee5920de1747dd4a284840081ed8d015c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FA 16900 bytes
font_02_sfnt_off00011d0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0A 16792 bytes

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