Malicious PDF — malware analysis report

Static analysis result for SHA-256 6367c467c35bbb8a…

MALICIOUS

PDF

31.0 KB Created: 2020-03-16 17:25:56 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: eb8324c6ee2c5dca4bf7bcabd4b0e412 SHA-1: d39880ce95069c5b2f0e2086657f808842a3f9a4 SHA-256: 6367c467c35bbb8affcab0454cecce10369e3e3a742d0123d7bcf23a161802b8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ML classifier also strongly indicated maliciousness. The embedded URLs point to various domains, likely serving as a distribution point for further malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://jessicalgervaisbooks.com/uploads/1/3/0/8/130873942/130873942.html#linear+regression+in+r+tutorial
    • http://myv12fitness.com/uploads/1/3/0/5/130539427/2165153.pdf
    • http://novacabinetanddecor.com/uploads/1/3/0/8/130813897/4915060.pdf
    • http://joyboxes.com/uploads/1/3/0/6/130621047/jimaf.pdf
    • http://www.life987.com/uploads/1/3/0/7/130775118/wumaw.pdf
    • http://sadfoxhack.com/uploads/1/3/0/6/130639573/fosot.pdf
    • http://douglasdonegani.com/uploads/1/3/0/7/130775123/a4635b5893b1.pdf
    • http://drivesuperiorcarriers.com/uploads/1/3/0/3/130313176/a09ce8dfb5.pdf
    • http://celticcolours.info/uploads/1/3/0/5/130539354/f69b117feef8729.pdf
    • http://spacharter.org/uploads/1/3/0/2/130291416/565009d.pdf
    • http://site.bvmp.com.au/uploads/1/3/0/6/130621015/634321f.pdf
    • http://thecountryeggarizona.com/uploads/1/3/0/4/130483194/viwowomuwixazek.pdf
    • http://hostmaster.chinahollandtravel.com/uploads/1/3/0/5/130538941/xavolomapasafu.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_off0000531a.bin
9ba0d8259fd5764932db68ea2c8d9674a8d1868ab26c697e2762e5e5bf436730		 pdf-font-stream PDF embedded font (sfnt) at offset 0x531A 7140 bytes

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