Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a2730d636e55cff…

MALICIOUS

PDF

47.1 KB Created: 2020-04-07 13:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 976d776ee0c3d42bc7db67fb30742d31 SHA-1: c92012054ade703785df85621ac8facb1739f0ad SHA-256: 9a2730d636e55cff47bb96f9fbfeb40d78f82914fe6d7e4cc8ac66907ef017e0
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDFs on different domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs are the primary indicators of compromise, suggesting a redirection or content delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://flightacademysdw.org/uploads/1/3/0/5/130540458/130540458.html#herramientas+manuales+para+carpinteria+en+bogota
    • http://wooddems.org/uploads/1/3/0/5/130545185/gejazuwedewu.pdf
    • http://adan.pt/uploads/1/3/0/4/130476102/f3b3d155659d0d2.pdf
    • http://vccrc.com/uploads/1/3/1/4/131483445/bunipa-nojipedeverulo-pafur.pdf
    • http://gobelove.org/uploads/1/3/1/4/131452782/9599338.pdf
    • http://totalhomesutra.com/uploads/1/3/0/5/130542813/wikugotipatinamutav.pdf
    • http://pimcphp.com/uploads/1/3/1/4/131453374/1666240.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_off00008944.bin
385d1ce2ec7ba6bc0ad14cbcc4feee38047fcdfc420db72cb9efa58338dac785		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8944 10200 bytes

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