Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c9f2aecf21aa82…

MALICIOUS

PDF

35.7 KB Created: 2020-06-23 19:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd2669670387594f79f77d774ad82fc5 SHA-1: e5589686246e82e03cca680d52a6426e58daf796 SHA-256: 35c9f2aecf21aa82ad2a1e0529906957a3b8bb0c1ed90d5dda724a454926b49f
92 Risk Score

Malware Insights

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

The PDF document contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body also explicitly mentions converting documents to PDF for free and includes several of these URLs. This suggests a link farm or redirection scheme designed to lead users to malicious content. No scripts were extracted from this sample, limiting the ability to determine specific payload delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cosjexs.com/uploads/1/3/0/5/130540176/130540176.html#convertir+de+doc+a+pdf+gratis
    • http://mail.re-formingfitness.com/uploads/1/3/1/3/131381881/todidowove.pdf
    • http://reppyconstruction.com/uploads/1/3/1/6/131608037/099caf08522.pdf
    • http://hostmaster.midlandfootballleague.co.uk/uploads/1/3/1/3/131383719/b78439c.pdf
    • http://stephsblingandthings.com/uploads/1/3/0/4/130490774/3cc19e749c0.pdf
    • http://msjackiesparkles.com/uploads/1/3/0/2/130288412/nadokojilafiwuk.pdf
    • http://ictarscolumbus.org/uploads/1/3/1/4/131483265/c59aec9f121a.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_off00004ae2.bin
218f78c33ccf650ac3be9bd2b216d32c4047d5a9163fda0ca8f56b6d9764ffa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AE2 5160 bytes
font_01_sfnt_off00005c84.bin
6dd2098558ccd2e86bc76f4639936d57e04c019d973856acf3391a671ee25c78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C84 11156 bytes

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