Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90f1687091b41da…

MALICIOUS

PDF

42.3 KB Created: 2020-06-17 11:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99274a01b76a380acc4209d997ada49a SHA-1: e99725d24c87f536c48f39e2c517d65df25ef6bb SHA-256: f90f1687091b41da76a030f5d9764f791533e91dbe6b7841a4ee20b88876dc40
100 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains embedded JavaScript and a significant number of external links, many of which point to other PDF files hosted on similar domains. This pattern is indicative of a link farm or redirection scheme designed to obscure the ultimate malicious destination. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is intended to deliver a secondary payload or lead the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://costassolutions.com/uploads/1/3/1/0/131070971/131070971.html#code+composer+tutorial
    • http://girvetcreations.net/uploads/1/3/0/8/130814935/d100c5cff5.pdf
    • http://windyacrespickles.com/uploads/1/3/1/3/131378771/3843295.pdf
    • http://jameswolcottproperties.com/uploads/1/3/0/2/130289735/vijaserenaxof.pdf
    • http://sjcconsulting.org/uploads/1/3/0/5/130588702/9492335.pdf
    • http://ourbeautifulfeet.org/uploads/1/3/1/6/131636845/6166154.pdf
    • http://sencilloelegante.com/uploads/1/3/1/0/131070230/pitilisivaf-duzirarolanaril-bedikapuvewe.pdf
    • http://spreadlovelivepeace.com/uploads/1/3/0/4/130435875/tanalinupodo.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000684a.bin
358ca4385956c26db5349df6ad3ab3ed8cd4e07b5e685d06efd31668bf22f1f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x684A 5020 bytes
font_01_sfnt_off0000795b.bin
6ded12dae39a3b6fff084713b2eba559abec4375264d82abfb4ff88804c1ddee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x795B 10016 bytes

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