Malicious PDF — malware analysis report

Static analysis result for SHA-256 410c49b57b861486…

MALICIOUS

PDF

67.6 KB Created: 2020-06-11 23:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06e8f11d38882df4b6f17dfbbc8060ee SHA-1: 1b6a6e89ab2091eb5836d8151a465ccb38653020 SHA-256: 410c49b57b8614868b743c51db01836fac9c1e20c2f5593f507948faee929cb9
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to domains that appear to be part of a link farm designed to host malicious content. The ML classifier strongly indicates maliciousness. The presence of numerous PDF_URI and PDF_SEO_LINK_FARM heuristics confirms the suspicious linking behavior. No scripts were extracted from this sample.

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://2m6.undesirable.us/uploads/1/3/1/4/131452923/131452923.html#secondary+hyperparathyroidism+guidelines
    • http://technobox.com.au/uploads/1/3/0/2/130291624/9779698.pdf
    • http://dreammakersdesignco.com/uploads/1/3/1/3/131380390/kizese.pdf
    • http://thekitchensinkmusic.ca/uploads/1/3/0/6/130604456/6901967.pdf
    • http://mta-sts.mx.jafsc.org/uploads/1/3/0/8/130815080/4153010.pdf
    • http://cronindefensestrategies.com/uploads/1/3/0/5/130538862/jukuj.pdf
    • http://forestfueles.com/uploads/1/3/0/5/130589036/c78c0d3744c.pdf
    • http://mail.anchorfloral.com/uploads/1/3/1/4/131452982/pukowadigaxa_narotososabiza_zidokezul_vepadolojejiroj.pdf
    • http://mta-sts.swiftswcd.org/uploads/1/3/1/8/131858403/mabegire.pdf
    • http://emilydelbridge.com/uploads/1/3/0/2/130291908/rawox.pdf
    • https://gunamitiluj.files.wordpress.com/2020/06/kujiwexamoxepapen.pdf
    • https://zujuluwepig.files.wordpress.com/2020/06/92685168812.pdf
    • https://nodezebibun.files.wordpress.com/2020/06/15573153166.pdf
    • https://rilusepo.files.wordpress.com/2020/06/lomorawam.pdf
    • https://levamine.files.wordpress.com/2020/06/69018329084.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_off0000c285.bin
b19c96f819edd920ba4f109c7d2ebc0e1841a51ef6c48b7657fb905e6319cb4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC285 13232 bytes
font_01_sfnt_off0000ebd1.bin
4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD1 16060 bytes

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