Malicious PDF — malware analysis report

Static analysis result for SHA-256 edbf9ad685f9b8a2…

MALICIOUS

PDF

36.5 KB Created: 2020-06-02 11:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10a2889e888ce72d0be8704133ed408b SHA-1: 0210a8e563b20a2331667ca5f54e7ca0a1f7fe0f SHA-256: edbf9ad685f9b8a2f6166349e9a41083016ec73852f240813364a82a0477f1f5
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, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the PDF structure and embedded URLs suggest a link farm or redirection attack.

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://thevintnerstavern.net/uploads/1/3/1/6/131606465/131606465.html#counting+coins+worksheets+2nd+grade+pdf
    • http://neonpalms.co.uk/uploads/1/3/0/4/130478819/vuwiwarekebixekufavu.pdf
    • http://jasonswhatley.com/uploads/1/3/1/8/131857598/443d0c0bd31d.pdf
    • http://conscioushippyproductions.com/uploads/1/3/0/4/130476183/716257.pdf
    • http://host.secure.server.name/uploads/1/3/1/3/131383664/mifewiwuwunezomivo.pdf
    • http://snowflakeinsurrection.org/uploads/1/3/0/6/130620478/2905950.pdf
    • http://tnickole.com/uploads/1/3/0/3/130313746/7722468.pdf
    • http://northeconstruction.com/uploads/1/3/1/3/131383533/pofomije_naxedixopi.pdf
    • http://campbellstrong.net/uploads/1/3/0/5/130544539/6a2fc18fdea.pdf
    • http://thevintnerstavern.net/uploads/1/3/1/6/131606465/terms.html
    • http://thevintnerstavern.net/uploads/1/3/1/6/131606465/dmca.html
    • http://thevintnerstavern.net/uploads/1/3/1/6/131606465/policy.html
    • https://ribodijexob.files.wordpress.com/2020/05/wefilavarixidejozibo.pdf
    • https://kuramajibi.files.wordpress.com/2020/05/49019441256.pdf
    • https://vasoponox.files.wordpress.com/2020/05/94432885951.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_off000061dc.bin
79aeb7354b7e6eb72dd5ecdb11fa7ff97f1a07bc5f888a1920682ea9652edeec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61DC 10652 bytes

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