Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2e451e5f5b7c7b7…

MALICIOUS

PDF

33.0 KB Created: 2020-04-19 21:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bba55eb930f5cf73470740d372de80d8 SHA-1: dfc7d87e7e435c93e9326edb0f08919570abc404 SHA-256: b2e451e5f5b7c7b72d2fc6b138c5c8fc8a58d0c45e36edc84441cc1b3ccc6284
92 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded external URLs pointing to various domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a high volume of such links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were extracted, the sheer number of external links is suspicious and likely intended to lead users to harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 3

  • 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.
  • 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://freedommedicalassociation.com/uploads/1/3/1/4/131452937/131452937.html#indian+army+training+song
    • http://rochestercorporatecatering.com/uploads/1/3/1/4/131408838/c82ae2a9.pdf
    • http://girasolsunshinewellness.com/uploads/1/3/0/7/130775261/00baf9118f5a29.pdf
    • http://desperatehousewaresatlanta.com/uploads/1/3/0/8/130814459/42b76c.pdf
    • http://dkgebaeudeservice.de/uploads/1/3/0/4/130483043/lexixeso.pdf
    • http://programadeintegridad.com/uploads/1/3/0/4/130483494/3b557a00d38e088.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b69.bin
c2a363acd2f5c894a7b4289a1d1fb0a9dcb44e8af91747d5cd68bea1df01db13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B69 7572 bytes

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