Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4243dfa744ada42…

MALICIOUS

PDF

40.1 KB Created: 2020-03-29 11:23:51 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a10c586c4c364483f35f7506073d3d12 SHA-1: 15c645a356c1143ad6c0ba78aa23646ce096b9f2 SHA-256: e4243dfa744ada4261d0e9e9fc0b224041a805cd48bc6d533c6130a887e8aab0
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 pointing to PDF files hosted on various domains. This pattern is indicative of a link farm, often used for SEO manipulation or to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the embedded links. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the immediate intent beyond the link distribution.

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://deventermanueletherapie.nl/uploads/1/3/1/4/131408062/131408062.html#club+fase+0+primaria
    • http://erinmckenzieinteriors.com/uploads/1/3/0/6/130621487/5103713.pdf
    • http://lukeleefitness.com/uploads/1/3/0/6/130620898/d33b0b4.pdf
    • http://tamaracklaw.ca/uploads/1/3/0/9/130969709/2580803.pdf
    • http://seancastaneda.com/uploads/1/3/0/6/130605493/f6eb11bc8a.pdf
    • http://camsexboys.com/uploads/1/3/0/8/130874492/a418844d3b3.pdf
    • http://viandas.org/uploads/1/3/0/8/130874102/5808876.pdf
    • http://swissinnovationchallenge.com/uploads/1/3/0/3/130323253/dopoxipub_gexotu.pdf
    • http://cemento-stampato.org/uploads/1/3/0/2/130287238/sofinurekotasav.pdf
    • http://mylittlewaxspot.com/uploads/1/3/0/2/130291555/nuzebabe.pdf
    • http://martialartsinleaside.com/uploads/1/3/0/2/130288768/4892624.pdf
    • http://milesworthjourneys.com/uploads/1/3/0/5/130588872/rudidiniz.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c0e.bin
164ff153ece90822ade6ca3b616dc179b96fd76be1ad00b10e55771ae132dd49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C0E 8952 bytes
font_01_sfnt_off00007c60.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C60 16204 bytes

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