Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b52e9457ec729e0…

MALICIOUS

PDF

33.3 KB Created: 2020-05-07 16:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b5c6676930e84c5958ddcc02af57947a SHA-1: 413b519bb200c4e709b89b7a39b5fdb8e1ce398c SHA-256: 8b52e9457ec729e025bfebb59c51135f9009dcc1aa84db328965e97f4b77096c
92 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many of which are to SEO-optimized URLs on various domains. This pattern is indicative of a link farm designed to funnel traffic to malicious sites or to obscure the true destination. The ML classifier strongly flagged this PDF as malicious, supporting the interpretation of a malicious redirection or content delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://marilusdesigns.com/uploads/1/3/1/6/131607010/131607010.html#teacher+guidelines+geography
    • http://bakerhealthconsulting.com/uploads/1/3/1/0/131070501/0d9b1.pdf
    • http://elmimpressions.com/uploads/1/3/0/2/130289676/juruxelin_vawegaxolomigom.pdf
    • http://northernallureaesthetics.com/uploads/1/3/0/9/130968961/44cdd4b1.pdf
    • http://horizonchemtech.com/uploads/1/3/0/5/130590117/0b861f.pdf
    • http://myleeinc.com/uploads/1/3/0/6/130605517/muzakusilo-widimifi-foguvaxunimo-dovigex.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off00005849.bin
be49bbc466cf4c9ec4524982e461a15d42850948a0d60717adf85bf1f4d93502		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5849 10444 bytes

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