Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ebef67ebe8310d…

MALICIOUS

PDF

37.5 KB Created: 2020-04-28 12:39:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2f02a35cc379f4399f7c40a93c15b8ed SHA-1: 65c30e019600f6347b43ff0e99a61ba4131795fb SHA-256: f7ebef67ebe8310d3b5acd86dacaafaf1f84490ba9aeec70a0cb9307129b349f
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute malicious payloads. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://andresexpres.com/uploads/1/3/1/0/131071188/131071188.html#newman+junit+report+example
    • http://sfbayflowers.com/uploads/1/3/1/6/131606150/347ae830a9.pdf
    • http://tacconeconstruction.com/uploads/1/3/0/7/130776201/gesusawejerare.pdf
    • http://thelookingglass1996.net/uploads/1/3/1/3/131398545/luzetebus.pdf
    • http://jalksjdlfkjslkjf01.space/uploads/1/3/0/7/130776100/5da0f9732f.pdf
    • http://creativeheartbeats.com/uploads/1/3/1/3/131379543/difapumomubire_fusugupasap_golilazafe_gibixixu.pdf
    • http://sagmeister-wine.com/uploads/1/3/1/0/131070535/1127296.pdf
    • http://xoglamaccess.com/uploads/1/3/0/3/130379435/83bd4bad6.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_off000066f8.bin
871983dce4d8647eeec4b9d3afe4846f65c6deae61fa4093a888faebad012566		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66F8 8908 bytes

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