Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c89b941c0e6fcdf…

MALICIOUS

PDF

37.1 KB Created: 2020-04-05 08:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: af9bb12d6389bbe7e6a340fea948a685 SHA-1: e835031afa700bdfd696511731b4c1a8beb02b00 SHA-256: 4c89b941c0e6fcdfd8c8b33e8b8f413a647f5218c27dbc82ed46e73973c2fa8b
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF files hosted across numerous domains. This behavior is indicative of a link farm or SEO manipulation tactic, potentially used to distribute malicious content or improve search engine rankings for harmful sites. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://nanditayoga.com/uploads/1/3/1/3/131384284/131384284.html#que+son+las+maquinas+compuestas+ejemplos
    • http://alexislae.com/uploads/1/3/1/3/131381787/zovobeja.pdf
    • http://vetstack.com/uploads/1/3/0/6/130604295/zijeme.pdf
    • http://mavamanitoba.ca/uploads/1/3/0/7/130776085/genezazugejoz.pdf
    • http://wowcoolman.com/uploads/1/3/0/9/130969973/tobubakus-jinixebesorag.pdf
    • http://poppymcpherson.com/uploads/1/3/1/4/131408224/6766487.pdf
    • http://theatticelf.com/uploads/1/3/0/2/130289595/0e34e5440d.pdf
    • http://ptechr.com/uploads/1/3/0/5/130539231/5255240.pdf
    • http://airwaymom.com/uploads/1/3/1/1/131163772/zukowutunu.pdf
    • http://heartwoodcounselingpcm.com/uploads/1/3/0/5/130545434/4c479bb572.pdf
    • http://lesgrandsmagneux.com/uploads/1/3/0/5/130550688/bofubemela.pdf
    • http://alqassam-electronic.com/uploads/1/3/0/2/130291694/tenovajekuki.pdf
    • http://seaqueenshairboutique.com/uploads/1/3/0/5/130588451/20fbf.pdf
    • http://jakebaileyaldrich.com/uploads/1/3/0/5/130550969/jivofixanefigi.pdf
    • http://back-to-wholeness.com/uploads/1/3/0/6/130620441/6544600.pdf
    • http://adimef.com/uploads/1/3/0/9/130969918/5c34532.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_off000068d1.bin
209807404d41becfa871b7218b336caca53ca8eddf1e467ecb53576a5c783160		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68D1 7772 bytes

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