Malicious PDF — malware analysis report

Static analysis result for SHA-256 d01544637e7d5fe7…

MALICIOUS

PDF

35.9 KB Created: 2020-04-11 09:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 223987a7f48863c54329806e153c201a SHA-1: c1a35eda5882d66fd73237b32d3c60776926caee SHA-256: d01544637e7d5fe7ad0ec2fb00233a2226797806996618220fe78f61b4c6b0d5
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDFs with numeric slugs, suggesting a link farm for SEO manipulation. One of the embedded URLs, 'http://74-123-73-226.mgwnet.com/uploads/1/3/0/8/130813855/130813855.html#nissan+elgrand+owners+club', is presented as content related to a car club, likely a lure to direct users to a malicious site. The ML classifier strongly flagged this PDF as malicious.

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://74-123-73-226.mgwnet.com/uploads/1/3/0/8/130813855/130813855.html#nissan+elgrand+owners+club
    • http://nudibranchartglass.net/uploads/1/3/0/6/130639544/3369737fb01a970.pdf
    • http://nscnashville.com/uploads/1/3/1/3/131380612/c34ccce798.pdf
    • http://presenthk.com/uploads/1/3/0/6/130620691/rudutivodiwasal.pdf
    • http://74-123-79-71.mgwnet.com/uploads/1/3/1/1/131164063/1e04823d02657.pdf
    • http://dustinbear.com/uploads/1/3/0/5/130540077/xesomixoru.pdf
    • http://sealexpress.net/uploads/1/3/0/4/130488773/rudevirov.pdf
    • http://mhidesigngroup.com/uploads/1/3/1/3/131398154/66fe9bf3.pdf
    • http://immigrantuk.com/uploads/1/3/1/4/131454440/javaxunopiwupikaj.pdf
    • http://asiapacificjapan.com/uploads/1/3/1/0/131070152/besesep_pelam.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_off000062d5.bin
bf5653a59e7539ebd2f0c53c5bef7ede63290bc2ae3aa591d396153cb2301edf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62D5 8928 bytes

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