Malicious PDF — malware analysis report

Static analysis result for SHA-256 b92a317f247e3e14…

MALICIOUS

PDF

36.9 KB Created: 2020-03-27 07:43:37 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9932a3c652ec9932b7249181ebb8e5ff SHA-1: eacd983e66d3a0038e2d9052a9491a455562a8b2 SHA-256: b92a317f247e3e14c502cb294d94d518d8bbb3db169330f45c3a93a0600d50b3
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique commonly used to create link farms for SEO manipulation or to distribute malicious content. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies this pattern, indicating the document's primary purpose is to redirect users to other sites. The ML classifier also strongly suggests maliciousness. No scripts were extracted, and the document body is heavily obfuscated, making it difficult to determine a more specific attack pattern beyond link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://harellbusinesssolutions.com/uploads/1/3/0/5/130539035/130539035.html#43+mm+x+cm
    • http://weatherisgood.com/uploads/1/3/0/6/130604022/kupoki.pdf
    • http://withgoodness.com/uploads/1/3/0/5/130590140/boluveso.pdf
    • http://hostmaster.avucciria.co.uk/uploads/1/3/0/8/130814360/tufuwetovutur-jujazujaj.pdf
    • http://churchatjoes.com/uploads/1/3/0/3/130323229/midifejoda.pdf
    • http://dallasemergencyplumbers.net/uploads/1/3/0/4/130476970/7979411.pdf
    • http://www.mariavinogradova.com/uploads/1/3/0/7/130776791/duxefi.pdf
    • http://mindsetengineering.com/uploads/1/3/0/6/130620279/nejofarod-midipetinosalaw-zipotixan.pdf
    • http://thesaltcave.net/uploads/1/3/0/7/130776418/5bb9d805fe3426.pdf
    • http://soterianow.com/uploads/1/3/0/4/130478609/tapatovo.pdf
    • http://mshipco.com/uploads/1/3/0/2/130270994/9998212.pdf
    • http://famousmoose.com/uploads/1/3/0/5/130550881/1429da.pdf
    • http://sml4future.com.au/uploads/1/3/0/7/130738499/9557629.pdf
    • http://301barbershop.com/uploads/1/3/0/4/130488273/xofanux.pdf
    • http://outofthewoodsheather.com/uploads/1/3/0/7/130776056/5758355.pdf
    • http://releifricktal.ch/uploads/1/3/0/7/130738591/bujelunev.pdf
    • http://lightcodesmusic.com/uploads/1/3/1/3/131383269/2be569e4a87ebd7.pdf
    • http://vhouse2020.com/uploads/1/3/0/5/130544240/givuxabixuxe_sutovim_rubazawuvifofid_popalawedu.pdf
    • http://northernpacificbuilder.com/uploads/1/3/0/8/130814193/03fc65c7.pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007179.bin
c9356b025a6945d1af96bfe4378256440e18d5d3477705a98aa4217d8bf7c71c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7179 7860 bytes

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