Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3988beb4bfc7b7a…

MALICIOUS

PDF

45.8 KB Created: 2020-03-25 09:32:14 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 109daacaf6a396d9eddc0a3236a50aa7 SHA-1: a0bbdd440ec54e3b2e60c3807fa11d50792b9781 SHA-256: b3988beb4bfc7b7a05f47fd3b95003ba20fa587550dcfc148b16dec6a9d41afc
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents hosted on different domains. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to act as a link farm, potentially for SEO spam or to distribute further malicious content, rather than providing direct user-facing information.

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://michaudwellness.com/uploads/1/3/0/4/130476565/130476565.html#elementos+de+un+modelo+de+comunicacion
    • http://northernwoodlandindianart.com/uploads/1/3/0/7/130740242/9716844.pdf
    • http://keeping-it-natural-aromatherapy.com/uploads/1/3/0/8/130874154/poxeba.pdf
    • http://www.welovedogs2374.com/uploads/1/3/0/7/130738875/1253c8.pdf
    • http://afhe.org.au/uploads/1/3/0/2/130291689/a306fbd06.pdf
    • http://www.manatonmakers.com/uploads/1/3/0/6/130605222/zefapirakitusibadoze.pdf
    • http://thecscllc.com/uploads/1/3/0/5/130588803/7575888.pdf
    • http://adrenalinerushcomics.com/uploads/1/3/0/3/130323616/pelojifi_jewetisifafuw.pdf
    • http://tonycon.com/uploads/1/3/0/4/130435571/1828197c40.pdf
    • http://mohussain.com/uploads/1/3/0/6/130604604/wevetumejupef_sixosovikaj.pdf
    • http://alevelapps.com/uploads/1/3/0/4/130476981/kovumukopes.pdf
    • http://lunaparkstudio.net/uploads/1/3/0/9/130969420/dawuvuko.pdf
    • http://softwarehabits.com/uploads/1/3/0/2/130289252/zorin.pdf
    • http://becomeamedicareagent.com/uploads/1/3/0/8/130873930/jonagi_tosolos_xinopivumeren.pdf
    • http://interstellarbrands.com/uploads/1/3/0/7/130776040/sejirapinozo.pdf
    • http://mail.1stpresby.org/uploads/1/3/0/4/130476372/4470917.pdf
    • http://seitahome.com/uploads/1/3/0/6/130620614/xalalebav_zinepubaxuk.pdf
    • http://nevenann.com/uploads/1/3/0/5/130589058/muxuro.pdf
    • http://www.benchmarkcq.com.au/uploads/1/3/0/3/130312983/1de9cd2ea8.pdf
    • http://hostmaster.francisfoster.co.uk/uploads/1/3/0/8/130814132/17abb3de7.pdf
    • http://sentientearth.net/uploads/1/3/0/5/130551775/7835514.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_off00008752.bin
190fc06fd235b6272942f0cf0e5da487f15e0d3955693fbc821ec5d36fe17e48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8752 8940 bytes

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