Malicious PDF — malware analysis report

Static analysis result for SHA-256 f301dc18ba0c26d1…

MALICIOUS

PDF

74.2 KB Created: 2021-07-12 20:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5add924496a8623ceba23aace51a9b0 SHA-1: d7784c5af1f09c48c4b86473e0186ffd62049f87 SHA-256: f301dc18ba0c26d1ad5f25aced8ad53ba883ee3928d4ec99c57392018d6122a0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests a potential phishing or exploit delivery mechanism. The `wkhtmltopdf` authoring application and the PDF structure itself may be indicative of a known exploit or a custom-crafted malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8028

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/razvivatel/yapz/~3/NsX9ihectO0/square?utm_term=age+structure+diagram+declining+population
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e953a32210ba6bce13a1b3/1625904035526/16226760008.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec7155dd2ac847ff7ca852/1626108245401/creation_regained_albert_wolters.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e7b4e946a8e17713e2dd2d/1625797865371/10453077727.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_off0000bf64.bin
963e917807edfa22ac93a002ad4e1f81a74331254852cf6ed1d3a9255cbc40a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF64 10940 bytes
font_01_sfnt_off0000d88b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD88B 16792 bytes
font_02_sfnt_off0000f09d.bin
0f5698b579b580fb298784d4b888608ec3e122b032a0b98f202921b160039550		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF09D 17016 bytes

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