Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d31925f8422e2c…

MALICIOUS

PDF

45.6 KB Created: 2020-05-31 04:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04aec2d8674d60bfaf046f257d070851 SHA-1: a88b91e6e12c56c651c3eb1fa79e7502cdb7991c SHA-256: 93d31925f8422e2c6308cb24cd9666801453798fb09eb9f2b871f610fa3426de
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to various domains, a technique commonly used for SEO poisoning or to redirect users to malicious content. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies this pattern, indicating a likely attempt to manipulate search engine results or distribute malware through a link farm. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://hyparel.com.au/uploads/1/3/0/4/130489650/130489650.html#ark+repair+item+command
    • http://omnirmc.com/uploads/1/3/0/9/130969887/fonoj_pebuno_jedufowasasi_mufukadir.pdf
    • http://rustbeltbikes.com/uploads/1/3/1/4/131408371/firomemigumuj.pdf
    • http://malikarosetennis.com/uploads/1/3/1/4/131453633/xuxapefi-nofunepitu-petatuvijatik.pdf
    • http://yvettewjones.com/uploads/1/3/0/7/130739878/2881092.pdf
    • http://selfshopsevaluation.com/uploads/1/3/0/6/130620791/fewobos.pdf
    • http://karenov.fr/uploads/1/3/0/4/130483836/jirapu-kogoxibavusidup-rasubalusebi-vijesuk.pdf
    • http://hospitalityofthesouth.com/uploads/1/3/0/8/130873986/d0718a5ae4e43c7.pdf
    • http://decreaseoxidativestress.com/uploads/1/3/1/4/131438514/dikasiletakel.pdf
    • http://bluerosehealingcenter.com/uploads/1/3/1/6/131606345/4853846.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_off0000868f.bin
e4fb91df4e24f8629dbb0a89074b0ae9f2a95d776724cedc395a9b95d1e33c0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x868F 10792 bytes

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