Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb5d8177d58ceda…

MALICIOUS

PDF

37.9 KB Created: 2020-04-10 16:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e49deea16f4427c4e4cca2bdebbcbd45 SHA-1: 39899762db9304f63503ec071f82650c038b0ed1 SHA-256: dfb5d8177d58cedac3685a81daa4dbc05ac7fd54afe41db40a027d5aa9b5dadd
96 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 to various domains, indicative of a link farm or SEO abuse tactic. The ML classifier strongly flagged this PDF as malicious. The primary purpose appears to be directing users to a network of SEO-optimized PDF landing pages, likely for malicious redirection or content delivery.

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://zumarock.org/uploads/1/3/0/7/130738497/130738497.html#a+los+pies+del+maestro+charles+spurgeon+pdf
    • http://imamurasoapco.com/uploads/1/3/1/3/131379939/4501291.pdf
    • http://jackiesmallma.com/uploads/1/3/0/5/130589430/xagojas_webizajeveja_janademado.pdf
    • http://fortuneadhdcoaching.com/uploads/1/3/0/5/130588509/woturukojaj-xamebirizivon-rupumewuzujew-narimarosoladon.pdf
    • http://salestransformationnetwork.net/uploads/1/3/0/6/130620794/9585849.pdf
    • http://meganmccannpr.com/uploads/1/3/0/2/130287548/fd0358aaa48.pdf
    • http://syncessentials.com/uploads/1/3/0/5/130589353/pukegalifot.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_off00006758.bin
2e54b2bc9521243b61ae127ebad54b8a83ce9f52363ed3d48cda27bc4f73d0db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6758 9500 bytes

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