Malicious PDF — malware analysis report

Static analysis result for SHA-256 420f75f3ab613ecf…

MALICIOUS

PDF

32.9 KB Created: 2020-04-07 08:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a8a009d888ada73f7678f9d73be79a0d SHA-1: c49fbccb75df37903cd28bf6f8e46e5e92199c0f SHA-256: 420f75f3ab613ecf2f7f02b86783e2e99827c6f7e8d8d24e0c58d6c3b713e3e6
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm for SEO manipulation or to host malicious content. The document body, though partially corrupted, contains text related to 'adjectives worksheets for grade 1 pdf with answers', which is likely a lure to encourage clicks on the embedded URLs. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious nature of the embedded links.

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://savonappliances.ca/uploads/1/3/1/4/131453681/131453681.html#adjectives+worksheets+for+grade+1+pdf+with+answers
    • http://vakantiehuis-in-de-ardennen.nl/uploads/1/3/0/4/130435851/5417968.pdf
    • http://microbearding.com/uploads/1/3/0/5/130588221/zisifopib.pdf
    • http://domeniccaruso.com/uploads/1/3/0/6/130604782/bapiramomopif-migewoveragi-gejotukagi-boxujeravizom.pdf
    • http://lauraslockett.com/uploads/1/3/0/5/130588220/rawuzed-muradudor-bepatugisogaj-tiferugi.pdf
    • http://katiemccollough.com/uploads/1/3/0/5/130590117/wifupoxedefude.pdf
    • http://mariborskiok.org/uploads/1/3/0/4/130435872/mesobikimibip.pdf
    • http://metersnelectronics.com/uploads/1/3/0/2/130291475/rukuxufegomijakosado.pdf
    • http://systemsuitabilityanalytics.com/uploads/1/3/1/4/131406344/2358326.pdf
    • http://www.drconsultinginc.com/uploads/1/3/0/6/130604448/1683699.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_off000059aa.bin
998a00dd0e7c7027d3b041c4f534d50b736bbf9d331582ec5d3b5f100608f258		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59AA 7444 bytes

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