Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7e9b44d86679308…

MALICIOUS

PDF

46.1 KB Created: 2020-04-05 09:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 144a569d82a2b4313a59a76aa767c801 SHA-1: c00cf9cd913223571defd76452495b7264de4273 SHA-256: d7e9b44d8667930894361509187614fd240f615d4e63fafaeac5ee5c1a6f7358
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though malformed, contains a URL that is also present in the list of embedded links. This suggests the primary purpose is to direct users to a network of potentially malicious websites.

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://mkequipements.ca/uploads/1/3/0/9/130969981/130969981.html#what+station+is+qvc+on+fios
    • http://rcctheatre.org/uploads/1/3/0/5/130588452/2022356.pdf
    • http://rchandymanservice.com/uploads/1/3/0/6/130604516/maxekudo_tabelipolajom_vubagu_rusaxeg.pdf
    • http://thechairmansdaughters.com/uploads/1/3/1/3/131378970/b9ca30.pdf
    • http://www.gabferreira.net/uploads/1/3/0/7/130738753/9089082.pdf
    • http://snakeriversecurity.com/uploads/1/3/0/8/130814729/nukikavinero.pdf
    • http://kindredbrew.com/uploads/1/3/0/7/130776886/pewed-nexizilumawise-sugawinapet.pdf
    • http://waynesbororecklessdrivingattorney.com/uploads/1/3/0/8/130813998/487ccce82.pdf
    • http://zentranet.ru/uploads/1/3/1/4/131438641/vobamile.pdf
    • http://kaffeeblack.biz/uploads/1/3/1/0/131069899/5942313.pdf
    • http://musiccitypetpartners.com/uploads/1/3/0/5/130540661/muderesi_bifejojebepapi_larixolikuvixef.pdf
    • http://adcounselling.net/uploads/1/3/0/3/130313786/gugola.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_off000080aa.bin
de94851028cf7f394748062e5bdaa970bb02d8f9b716ab9d5d4b6cf94e9fad80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80AA 9292 bytes
font_01_sfnt_off0000a2cd.bin
7882596a78fedf7411e61954b60ad86f4a9cd4423f99e2a017604429f9ae9e4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2CD 1644 bytes

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