Malicious PDF — malware analysis report

Static analysis result for SHA-256 4109f59b9a745898…

MALICIOUS

PDF

34.3 KB Created: 2020-04-25 11:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9f2cffe6fe6f439e7d3c56a23d2033cb SHA-1: 5ade909faf2023f579d78c14eab1d71801cf23d3 SHA-256: 4109f59b9a74589861f32df2e0c5acda3ee4f64831bec44175707b277f432bff
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or a method to distribute malicious content across multiple sites. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine a specific user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://myamazonuk.com/uploads/1/3/1/4/131453615/131453615.html#hvac+conceptual+design+report
    • http://mycookbookobsession.com/uploads/1/3/0/6/130604656/nuvadegimesaj.pdf
    • http://feardonald.com/uploads/1/3/1/3/131380623/vofipolusa.pdf
    • http://anushatumkur.com/uploads/1/3/1/3/131379706/leratisowixezuxoboge.pdf
    • http://arcab2.com/uploads/1/3/1/3/131383750/6ed94b365.pdf
    • http://myfitlife2go.com/uploads/1/3/0/5/130543020/443266.pdf
    • http://1663turk.com/uploads/1/3/0/7/130775520/3e7e78bbc5bbf0f.pdf
    • http://reconcilemn.org/uploads/1/3/1/0/131070441/jibefodovodafetisope.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_off00005f4d.bin
3dcc2742f5213c2ae3727631a40e87eec1cda45d74230db723779ee210440375		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4D 7756 bytes

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