Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d50b48e7560f077…

MALICIOUS

PDF

30.9 KB Created: 2020-04-10 20:39:45 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 04987884069e9dc3dbd1b36284d2cafe SHA-1: 524244b557c746bfd4dc3d70633ae909adadaecc SHA-256: 3d50b48e7560f077fde20803b3c8ae3026768cd30aaf56b08e061551d5d81cf8
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 to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this sample as malicious, supporting the assessment of a malicious intent. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://mcatgent.org/uploads/1/3/1/1/131164351/131164351.html#mil+hdbk+454+guideline+9+workmanship
    • http://southcarolinamarijuanalaw.com/uploads/1/3/0/7/130740113/ea259379.pdf
    • http://pogorings.com/uploads/1/3/0/6/130621426/2596412.pdf
    • http://copenhagen-shopping.com/uploads/1/3/0/5/130551467/mabetidamatuv.pdf
    • http://sandiegofurnishedrentals.com/uploads/1/3/0/3/130324170/watubipujix.pdf
    • http://thebeautymeclub.com/uploads/1/3/1/1/131164257/2797696.pdf
    • http://ovationacupuncture.net/uploads/1/3/0/8/130813851/vegev.pdf
    • http://shyrahja-art.com/uploads/1/3/0/8/130874109/9963384.pdf
    • http://insuranceandretirementsolutions.net/uploads/1/3/0/4/130436315/damuwipesir.pdf
    • http://criticalpathpartners.com/uploads/1/3/0/4/130483739/3372416.pdf
    • http://2001ndivisionharvard.com/uploads/1/3/0/2/130289418/866691.pdf
    • http://alexabuffini.com/uploads/1/3/1/4/131455275/1669677.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_off0000528d.bin
f83a93143317c5a08e5752c2ec51db9ba0a6d58da9fd39df331151dfdcb83af5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x528D 7204 bytes

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