Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf36c61a2e18e9a…

MALICIOUS

PDF

36.6 KB Created: 2020-03-30 17:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cbc3dd79fd6704bc1e7563fa0ecd504e SHA-1: 1f488a80601e1c2f15a221708744cabfd327be19 SHA-256: acf36c61a2e18e9ae92157c63b1c8f5e98b8f3aef5be99b2ca64460416531fff
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, many of which appear to be part of a link farm. The heuristic 'PDF_SEO_LINK_FARM' strongly indicates this behavior. The ML classifier also flagged the PDF as malicious with high confidence. The document body contains a mix of what appears to be legitimate text and obfuscated content, including URLs that are likely part of the malicious infrastructure.

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://melissaleschuck.com/uploads/1/3/0/6/130621942/130621942.html#onkyo+tx-sr705+service+manual
    • http://brokerswhocare.net/uploads/1/3/0/6/130603979/dilelowibor-fosofolilamel-zelidubugoneta-lefig.pdf
    • http://tertig.com/uploads/1/3/0/5/130588214/zovixe-puvufi.pdf
    • http://strategicwritingandediting.com/uploads/1/3/1/1/131163832/de473e.pdf
    • http://gartnersupplychain.com/uploads/1/3/0/5/130551898/xosutopaxeje.pdf
    • http://greenbridgeconsult.com/uploads/1/3/0/2/130274032/katoz-xanenapaterasu.pdf
    • http://artfullyinspiredcoaching.com/uploads/1/3/0/7/130739238/e9dfad.pdf
    • http://adayofhope.co/uploads/1/3/0/3/130379078/ac9127.pdf
    • http://eugenedoyen.org/uploads/1/3/0/6/130639822/votam.pdf
    • http://healystars.com/uploads/1/3/1/4/131406295/7704950.pdf
    • http://beyondshirts.shop/uploads/1/3/0/3/130323249/rofija-peturaxilejag.pdf
    • http://freshmp.biz/uploads/1/3/0/4/130483765/fareti.pdf
    • http://acifte.org/uploads/1/3/0/6/130639592/f050b11aa68.pdf
    • http://hostmaster.honeycombloom.co.uk/uploads/1/3/0/2/130289214/jidileka-lonuwulekapu.pdf
    • http://evkdesigns.com/uploads/1/3/0/5/130552106/309b037dc.pdf
    • http://homeinspectoralbuquerque.com/uploads/1/3/0/5/130589334/zagerupobex.pdf
    • http://goodidealschool.com/uploads/1/3/0/7/130775241/3238f9.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_off0000641f.bin
a8d831f8b1ee4aeaf23adab5e893af5715002329a182fae44f65d5802ebba607		 pdf-font-stream PDF embedded font (sfnt) at offset 0x641F 8788 bytes

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