Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa9d2d1df4f5a48f…

MALICIOUS

PDF

35.1 KB Created: 2020-05-30 14:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b199b83e6d013a36c73dfee05824830e SHA-1: 6a01d68b863eace34a8cc021eb751523d4f3f8f8 SHA-256: fa9d2d1df4f5a48f2d81f34a037a008ba2cbb78c5cf8a9758cd59200b4a5c30e
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body contains text related to chemistry, but the primary malicious activity appears to be the distribution of numerous links to external domains, likely to distribute malware or engage in SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://billhannahmedium.com/uploads/1/3/0/4/130483866/130483866.html#hidrocarburos+saturados+e+insaturados+propiedades+fisicas+y+quimicas
    • http://mta-sts.synchealthfit.net/uploads/1/3/1/3/131380320/bozosovujob_sosubujem_fepum.pdf
    • http://ou-sooners.us/uploads/1/3/0/6/130639456/908952.pdf
    • http://libomusic.com/uploads/1/3/0/6/130620362/cc7ec7b.pdf
    • http://lescongolaisinsoumis.com/uploads/1/3/0/6/130604031/582049.pdf
    • http://britishdefencemilitia.com/uploads/1/3/0/3/130323422/xivomure_bokovo_vobafix_jadewozevudal.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_off00005963.bin
83c243a06b355c4548a8e3b281bc7dd9cf0ec1b3d34a70a71a7e4230f237eefa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5963 11700 bytes

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