Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f09cf5e0b0f2724…

MALICIOUS

PDF

34.8 KB Created: 2020-03-30 02:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f59cd7468a42b9ba1df993b1d2eb5bac SHA-1: d87f2ac119454812b984b62fbfa0819dc714e083 SHA-256: 3f09cf5e0b0f27240b82fab113a02688771783e4e24e241dfcdf9f464424132b
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, which is a common technique for SEO poisoning or distributing malicious content. The ML classifier also strongly indicated maliciousness. The embedded URLs likely lead to further stages of an attack, such as phishing pages or malware downloads.

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://wcd-3ni9vm8.mgh-r.ch/uploads/1/3/1/0/131070204/131070204.html#plantronics+explorer+233+manual
    • http://kgwritingservices.com/uploads/1/3/0/6/130604688/4964495.pdf
    • http://kaleyedascopize.com/uploads/1/3/1/0/131070572/jazakaxisober_lelig_ririjiragono.pdf
    • http://tremainefoundation.net/uploads/1/3/0/5/130551331/48cf31a.pdf
    • http://neokundalini.org/uploads/1/3/0/2/130291352/1862597.pdf
    • http://nicolettabuildingcontractors.com/uploads/1/3/0/3/130379363/vinejasetajijazuw.pdf
    • http://marissalauriane.com/uploads/1/3/0/4/130436337/3343033.pdf
    • http://sonny5ideup.com/uploads/1/3/0/5/130588779/4070529.pdf
    • http://esimathis.com/uploads/1/3/0/4/130483748/sunizusulexi-xarimifupokuv.pdf
    • http://skyehighnyc.com/uploads/1/3/1/4/131406809/8719716.pdf
    • http://austinacservices.net/uploads/1/3/0/6/130639216/b1ba5778.pdf
    • http://thesapphire.co/uploads/1/3/0/6/130639583/9825330.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_off00006076.bin
49d7e58540dba1df96dd485f8621923fcd835bccb8f2726a91e05cbeeb39ab35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6076 7608 bytes

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