Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53efc0d74b67b79…

MALICIOUS

PDF

29.2 KB Created: 2020-05-13 04:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ac2742e761175e2b142e37712caa1e37 SHA-1: d59ac75930b354c0bea22b8b6e06e7b8b5687003 SHA-256: e53efc0d74b67b7909c181d8af0acd2cd5fb73f70450f94be326c1d39da0da2d
92 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 other PDF files hosted on similar domains. This pattern is indicative of a link farm or SEO spam campaign, potentially designed to distribute malicious content or improve search engine rankings for malicious sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, limiting the analysis of direct payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://allianceconcept.net/uploads/1/3/0/5/130545742/130545742.html#2014+chrysler+town+and+country+radio+manual
    • http://circlecranchnd.com/uploads/1/3/0/7/130775556/3821892.pdf
    • http://oblivianstudios.com/uploads/1/3/0/7/130739956/gujibakimoxetijetare.pdf
    • http://brushhill-rvstorage.com/uploads/1/3/0/6/130621287/kajuduxufanunenogi.pdf
    • http://kababsara.com/uploads/1/3/0/6/130604193/bigirapoxu.pdf
    • http://cbdermproducts.net/uploads/1/3/0/8/130874389/ff4856533c807.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_off00004ac6.bin
6765d76b117039c5bb2fd636a5ad0a19c8ce4019b92add599ca53e698d54b8a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AC6 9204 bytes

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