Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5a85d3b31fe915…

MALICIOUS

PDF

34.0 KB Created: 2020-05-16 22:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b187fb0a79c822963e6fd793e4b2b981 SHA-1: efedc87d64a4180a0862c7e3eed69779a0d2f95b SHA-256: db5a85d3b31fe91550a05aa953d9db3df02b45ba96c381531c3ba41edab8e267
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to other PDF files on different domains. This behavior is indicative of SEO poisoning or a link farm designed to distribute malicious content or drive traffic. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, limiting the ability to determine specific payload delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://richardbrooksinvestigations.com/uploads/1/3/1/1/131164472/131164472.html#collision+theory+answer+key
    • http://ultimategamingleagues.com/uploads/1/3/0/4/130435925/edf2f.pdf
    • http://elizaprint.com/uploads/1/3/1/6/131636957/melisonorimesaz.pdf
    • http://lcosmetics.net/uploads/1/3/0/7/130739214/8ebeeb6.pdf
    • http://leoemercer.com/uploads/1/3/1/4/131453046/gofipuwa_winuvoduwop.pdf
    • http://bienetreaunaturelbyso.com/uploads/1/3/0/6/130604632/baaeb9b1d.pdf
    • http://juanlozaphotography.com/uploads/1/3/1/4/131437064/c22381157bcb.pdf
    • http://gocbdlifetoday.com/uploads/1/3/0/5/130590770/45f92b8d99bfc75.pdf
    • http://zombieland.studio/uploads/1/3/0/4/130476183/602837.pdf
    • http://dripzz.com/uploads/1/3/0/2/130272994/soxolozenozol.pdf
    • http://2pgroup.net/uploads/1/3/1/1/131164437/8210245.pdf
    • http://lesbeauxjours.net/uploads/1/3/1/6/131606434/piwefetodaz.pdf
    • http://imediate.de/uploads/1/3/0/6/130604243/dfa630aa8cf4.pdf
    • http://mhschangefoundation.org/uploads/1/3/0/3/130313117/tudofitewobi_divubaxuta_bodiligiv.pdf
    • http://newenglandroofing.com/uploads/1/3/1/8/131856277/sanolupimepa-womizowotuvujug.pdf
    • http://alfacucine.com/uploads/1/3/0/2/130291769/a6e2a45c3.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_off000059ae.bin
eeaecfb77285c3cc41878f7cf51e9c1116134afa2f12e137a3e9f303bdb960c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59AE 10324 bytes

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