Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c788097f452866…

MALICIOUS

PDF

40.2 KB Created: 2020-06-10 02:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29749e5c6022ed78bf4b6e05bb0ef86e SHA-1: 1afcd2b775064c118f992b9f77527f442b632e9e SHA-256: 91c788097f452866f6cafd90683868384cb81e991ffd7375a69723e48d16eca0
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, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. The ML classifier also strongly indicated maliciousness. The embedded document body text is heavily garbled but contains some of the same URLs, suggesting a deliberate attempt to obscure the malicious nature of the document. The primary attack pattern appears to be a link farm designed to direct users to potentially malicious or SEO-abusing 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://routestoknowledge.com/uploads/1/3/1/0/131070792/131070792.html#north+and+south+elizabeth+gaskell+pdf
    • http://2f4.undesirable.us/uploads/1/3/1/4/131438617/fatisuw.pdf
    • http://marketsherpa.com.au/uploads/1/3/0/6/130604945/latupizuzikegog.pdf
    • http://shalots.com/uploads/1/3/0/9/130969036/jigowukofuri.pdf
    • http://hostmaster.runningadventures.uk/uploads/1/3/0/7/130776451/b9765.pdf
    • http://doctormabuse-themovie.com/uploads/1/3/0/5/130551920/nalozutakow-wekosimomobasuf.pdf
    • http://hudsondayscarshow.com/uploads/1/3/1/4/131453592/6518343.pdf
    • http://74-123-79-170.mgwnet.com/uploads/1/3/1/6/131606065/kunibakogefasizori.pdf
    • http://mil-dare-rlt33.com/uploads/1/3/0/2/130289746/81058.pdf
    • https://zijutew.files.wordpress.com/2020/06/42509602382.pdf
    • https://gogedopopo213794333.files.wordpress.com/2020/06/50837726697.pdf
    • https://muzinag.files.wordpress.com/2020/06/63690431115.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d1d.bin
8c52585147fe1d6942f9e6ab787f26c5b301ddea8a4139bebb26730f71218765		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D1D 10540 bytes
font_01_sfnt_off00008158.bin
ad7d4f53ebbeda7878daa9d3ee0c7e7bd9fb5f2a2298dcd23b9b34a2dbcc090b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8158 16104 bytes

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