Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f373fb44db17489…

MALICIOUS

PDF

36.1 KB Created: 2020-04-15 03:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e744c8233cc296060c19302aa9238e5f SHA-1: 2f2e793897fca6cd27ba0f8275e75ea1bf92f4a9 SHA-256: 9f373fb44db174890f26d30ae1b754fec0f2a2a43f32b4cb15d0c1e448b82cfd
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection to malicious content. The ML classifier also strongly indicated maliciousness. The embedded URLs point to various domains, likely part of a campaign to distribute further malicious payloads or engage in SEO abuse.

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://annehoitink.nl/uploads/1/3/0/7/130775888/130775888.html#autumn+starting+here+starting+now+pdf
    • http://paleoandthesauna.com/uploads/1/3/0/3/130313582/57fbe99bb6bc.pdf
    • http://shantanujog.com/uploads/1/3/0/7/130775375/resepug.pdf
    • http://bookerteesmore.com/uploads/1/3/0/4/130435835/a75897c24a1.pdf
    • http://ericacauseyphotography.com/uploads/1/3/0/6/130639337/gitivupepadebezazil.pdf
    • http://garagefloor1day.com/uploads/1/3/1/4/131437092/1069391.pdf
    • http://vietthaiessex.com/uploads/1/3/0/7/130775635/5687259.pdf
    • http://visitcaddogap.com/uploads/1/3/0/5/130544138/minobifilub.pdf
    • http://www.montcoseniorgames.com/uploads/1/3/1/0/131070872/xeninobisoz_vofixu_dukexeniv_jemesi.pdf
    • http://thepscfoundation.org/uploads/1/3/1/4/131437573/jadew.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_off000064c0.bin
fb75755f25ce1b3ddcd5c60fa101686775b0284e9b5b0ee78c2de9e4ff0cd428		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64C0 8196 bytes

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