Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb991b0a388b5ea…

MALICIOUS

PDF

31.5 KB Created: 2020-04-05 05:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a13341db561d1224dccd1c740f0449be SHA-1: f0858fee2f8fae63e25efad6f2023d3b62ca2bc8 SHA-256: 8fb991b0a388b5ea47ef7e3a7dd6faf176be04d691da844952b6fd8966b47956
92 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, characteristic of a link farm or SEO poisoning attack. The document body, though partially corrupted, suggests an educational context, likely a lure. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior. The primary intent appears to be directing users to a network of potentially malicious websites.

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://lareynadelajmagicnails.net/uploads/1/3/0/6/130621882/130621882.html#libro+de+espa%C3%B1ol+telesecundaria+segundo+grado+volumen+2+del+maestro
    • http://peacewithfood.net/uploads/1/3/1/4/131437477/kajuza_joxoneduxolo.pdf
    • http://bluegreenaqua.net/uploads/1/3/0/8/130813860/gowidulesiti-zodigagevobo.pdf
    • http://mta-sts.mail.saigoncafezep.com/uploads/1/3/0/4/130476074/2c982401d01.pdf
    • http://seven7fourteenboutique.com/uploads/1/3/0/5/130588693/6843034.pdf
    • http://celinemramsingh.com/uploads/1/3/0/3/130324451/pafexa-wonujapa-winizujerubulo.pdf
    • http://sommerfestendingen.ch/uploads/1/3/0/5/130550703/8393256.pdf
    • http://woofloo.com/uploads/1/3/1/3/131398547/7906008.pdf
    • http://paulmichaelmba.com/uploads/1/3/0/7/130776715/nages-dubelumiw.pdf
    • http://couvreursderennes.com/uploads/1/3/1/4/131438392/fogutor_javukejapikot_zebad.pdf
    • http://el-equipo.com/uploads/1/3/0/5/130551726/jakoluxojexijuw.pdf
    • http://helpfornothing.org/uploads/1/3/0/8/130813991/xipevowedi.pdf
    • http://orionhomeinspect.com/uploads/1/3/0/3/130323375/4c9149a6241a.pdf
    • http://emily-dirks.com/uploads/1/3/0/5/130590456/2dae4e4ad55.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_off0000523c.bin
afdc649e5c09636c05147c933e41cf5aeb29420afe863100f44a296b85d6debb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x523C 7340 bytes

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