Malicious PDF — malware analysis report

Static analysis result for SHA-256 3acc09845592cf08…

MALICIOUS

PDF

31.6 KB Created: 2020-05-15 08:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01323121fc40a2bec2f67f62686c6510 SHA-1: 2924d98011ec0ae0fec949b80d9628f76778e5ef SHA-256: 3acc09845592cf085a2e834eb346ef5ddb8b15361a2c1806b66835d8ef63b26b
92 Risk Score

Malware Insights

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

The PDF contains a significant number of external links to various domains, many of which appear to be generated with numeric or book-like slugs, indicating a link farm or SEO abuse tactic. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to an 'Ethos logos pathos worksheet with answers' and includes the same URLs found in the heuristics, suggesting a lure to educational content to mask malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://kindspa.com/uploads/1/3/1/4/131406925/131406925.html#ethos+logos+pathos+worksheet+with+answers
    • http://evanstonrealtor.net/uploads/1/3/1/4/131437683/jutojofikulovevobas.pdf
    • http://stemhighschoolchattanooga.com/uploads/1/3/0/7/130775817/gosuxupis-jibixuluzil.pdf
    • http://mrzwiring.services/uploads/1/3/0/7/130776423/kagododu.pdf
    • http://hypoxiqenterprises.com/uploads/1/3/0/6/130640004/vonaruwijopu-gazobedufi-dezozuwurafu.pdf
    • http://sccl.fr/uploads/1/3/0/5/130550722/8c24e4f.pdf
    • http://simply-mro.com/uploads/1/3/1/8/131856285/sesevovexet-riwaxanixe.pdf
    • http://designinhd.com/uploads/1/3/0/5/130589269/bewalasoxatila-fololubonibu-xixowinofifasit.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_off00005261.bin
32119b6a26535291f05958b1c7319fae316ea452598b4e78b9a47eef583c61d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5261 9668 bytes

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