Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a2611fa77e2bd5…

MALICIOUS

PDF

44.0 KB Created: 2020-04-06 07:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 5dff676e4c1327758c0de24635e7c552 SHA-1: c02470c4d701b71ffa8796956a1b08139f06773b SHA-256: 90a2611fa77e2bd55cab251389e793f5ba37d260ae1aed6dca15cb398e8e7610
62 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used for SEO link farming or to direct users to malicious content. The document body, though partially corrupted, contains a mathematical phrase and references the wkhtmltopdf tool, suggesting it might be a lure. The primary heuristic identified a "PDF_SEO_LINK_FARM" with 14 external links, indicating a coordinated effort to distribute links across multiple domains. No scripts were extracted from this sample.

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://beauty-botox-and-brows.com/uploads/1/3/0/7/130775176/130775176.html#limite+infinito+menos+infinito+con+raiz+cuadrada
    • http://andrewlearforcitycouncil.org/uploads/1/3/0/5/130550775/jumenexazeba.pdf
    • http://heatingandcoolingwaterford.net/uploads/1/3/0/4/130435551/f582cc7bfc4b6.pdf
    • http://kjdconsulting.ca/uploads/1/3/1/1/131164016/4696910.pdf
    • http://bridlewiseridingacademy.com/uploads/1/3/0/5/130589219/vabalonamo_vajaj_fasobelerugafuw_gufaguju.pdf
    • http://curerecords.net/uploads/1/3/0/3/130323755/4404119.pdf
    • http://paper-mountains.com/uploads/1/3/0/5/130543543/kalibeb.pdf
    • http://oakalleydesigns.com/uploads/1/3/0/6/130603683/ce00c78fdd.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_off000073c9.bin
6e79a57af525fd32d009dace6585dc5460e9baef63b27534017b79be7c0b5bb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73C9 8944 bytes
font_01_sfnt_off00009421.bin
885781ec91db75dc8c4a6a3d3dac0324bdfdb8f2239dab70466c62035ae072da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9421 4144 bytes

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