Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba6a9e8afaa8be9…

MALICIOUS

PDF

36.8 KB Created: 2020-04-04 15:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 352f987a834b717f61a2019cddb21162 SHA-1: 45a4a9f38512daa0b468cce0281eb1e942f7e33d SHA-256: 4ba6a9e8afaa8be96340537190e38875ded9811175f71080cb2e26ef06e79ed0
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to various PDF documents on different domains, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier strongly indicated maliciousness. The embedded URLs suggest a link farm attack pattern, aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://childsafellc.com/uploads/1/3/0/5/130588951/130588951.html#kindergarten+teacher+resume+sample+no+experience
    • http://takeoff-fitness.com/uploads/1/3/0/8/130813757/5d253da220a7.pdf
    • http://lionfishwitch.com/uploads/1/3/0/2/130288830/subivadim.pdf
    • http://firstchoise.org/uploads/1/3/0/4/130475981/6023784.pdf
    • http://te-alton.com/uploads/1/3/1/4/131437619/warew.pdf
    • http://prmta.org/uploads/1/3/0/8/130814126/4093782.pdf
    • http://innovativegardensolutions.com/uploads/1/3/1/4/131438684/9826266.pdf
    • http://edenmeetingsandevents.net/uploads/1/3/0/7/130739772/5602260.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_off000068a3.bin
e81ef45fdbf6f410cc467213fa13b80a1c7b7f8043ed22976d0622f53bc9b2a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68A3 7608 bytes

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