Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f5546571e35a1f…

MALICIOUS

PDF

32.1 KB Created: 2020-06-03 13:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e71f8eae0e5f46b94f430d0d8241e3e SHA-1: e33ed14c60d5278d722db713e3639511c66f14fc SHA-256: c0f5546571e35a1f0f496086bf71f5363c2c9fe40a1cc87a99cb34954b70a6d6
92 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO poisoning to drive traffic to malicious sites. The document body, though heavily obfuscated, contains references to URLs that appear to be part of a link farm. The ML classifier strongly indicates maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. The primary intent appears to be redirecting users to potentially malicious content hosted on external domains.

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://bocaijiqiaoleiwenzhang.br3h.com/uploads/1/3/0/3/130323523/130323523.html#herman+miller+chair+adjust+arms
    • http://mocfly.com/uploads/1/3/0/3/130323585/kuxixaw.pdf
    • http://urbanartstherapy.com/uploads/1/3/0/6/130604289/510b6ede8e30c.pdf
    • http://musiconmagnolia.com/uploads/1/3/1/4/131407767/5654167.pdf
    • http://hostmaster.councilwomenworldleaders.org/uploads/1/3/0/6/130622024/telifupol.pdf
    • http://ingascony.com/uploads/1/3/0/5/130540176/tedexasewopi_nowoxezigukum_navoxowo.pdf
    • http://bocaijiqiaoleiwenzhang.br3h.com/uploads/1/3/0/3/130323523/terms.html
    • http://bocaijiqiaoleiwenzhang.br3h.com/uploads/1/3/0/3/130323523/dmca.html
    • http://bocaijiqiaoleiwenzhang.br3h.com/uploads/1/3/0/3/130323523/policy.html
    • https://rimasaxe.files.wordpress.com/2020/06/gepovile.pdf
    • https://riburawonak.files.wordpress.com/2020/06/muxipuwikuvubokuxewolo.pdf
    • https://xifoburufo.files.wordpress.com/2020/05/9584070469.pdf
    • https://tafobuzom.files.wordpress.com/2020/06/welawefuj.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_off0000571c.bin
f3c0198bca10811be2cab1159160fc43253e789f8a7ff0330c599e08af57b72d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x571C 8708 bytes

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