Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3fd125dbbd2b6d…

MALICIOUS

PDF

40.3 KB Created: 2020-06-03 02:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9948aa72e08614d6d2d89740054a922d SHA-1: 3d50d7f662587f3d047bb64925bca397655c40d3 SHA-256: 2a3fd125dbbd2b6d99666b13df459d7df1425d349f952fab0dd5a5dfd004e34f
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains. This pattern is indicative of a link farm or a phishing campaign designed to distribute malicious content or harvest credentials. The ML classifier strongly suggests maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior. No scripts were extracted, limiting the ability to determine a specific payload or execution method.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://stellacrawford.com/uploads/1/3/0/3/130324351/130324351.html#nuforce+dda-120+test
    • http://whitespacemarketing.org/uploads/1/3/0/7/130775868/e3e3d97a0058.pdf
    • http://412nwells.com/uploads/1/3/0/7/130740163/lakojuriziz.pdf
    • http://webmail.springwoodswimclub.com/uploads/1/3/0/7/130739956/3013750.pdf
    • http://myaccount.byrdpest.com/uploads/1/3/1/8/131857476/135a90.pdf
    • http://jrwoodley.com/uploads/1/3/0/5/130551581/7773247.pdf
    • http://stellacrawford.com/uploads/1/3/0/3/130324351/terms.html
    • http://stellacrawford.com/uploads/1/3/0/3/130324351/dmca.html
    • http://stellacrawford.com/uploads/1/3/0/3/130324351/policy.html
    • https://visazuk.files.wordpress.com/2020/05/senigife.pdf
    • https://momuniwidap.files.wordpress.com/2020/05/83451398908.pdf
    • https://nadobibiruz.files.wordpress.com/2020/05/kelijosofulunavegu.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_off00006cd3.bin
01ee7efbecab78715f56e457ae85061a7e7059b69d084420d797cc13f5d24e46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD3 11920 bytes

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