Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb40c35f58f3aefc…

MALICIOUS

PDF

37.8 KB Created: 2020-06-04 13:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3850ca809b52ec2579877640202be084 SHA-1: b6015e37d4c9b5615901fcd4f9441258b5e8db39 SHA-256: fb40c35f58f3aefcd25fe335183cf2882ce67b0be1600195da2598037db2bebe
94 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 domains. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains some of these URLs, suggesting a link farm or redirection scheme. The primary intent appears to be directing users to a large collection of external PDF documents hosted on potentially compromised or attacker-controlled websites.

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://host72.carmichaelnl.com/uploads/1/3/0/6/130639922/130639922.html#anatomia+adenoides+y+amigdalas
    • http://redrosebyceec.com/uploads/1/3/0/5/130588280/d8b73e.pdf
    • http://thekoparagroup.com/uploads/1/3/0/4/130488975/9864221dc40.pdf
    • http://mail.vailvalleybaptistchurch.org/uploads/1/3/0/8/130814421/8449136.pdf
    • http://ridgelyes.com/uploads/1/3/0/2/130288412/zorezizivo.pdf
    • http://thejewelersworkbench.net/uploads/1/3/1/3/131398102/xeroduve.pdf
    • http://mirrorimagemissions.com/uploads/1/3/0/7/130738501/3783307.pdf
    • http://the-clean-method.com/uploads/1/3/0/9/130969558/2058856.pdf
    • http://host72.carmichaelnl.com/uploads/1/3/0/6/130639922/terms.html
    • http://host72.carmichaelnl.com/uploads/1/3/0/6/130639922/dmca.html
    • http://host72.carmichaelnl.com/uploads/1/3/0/6/130639922/policy.html
    • https://mazagutote.files.wordpress.com/2020/06/bakoved.pdf
    • https://kobuzafub.files.wordpress.com/2020/06/61442562330.pdf
    • https://xefudud.files.wordpress.com/2020/06/povotokinupapejo.pdf
    • https://piwigaf.files.wordpress.com/2020/06/wezezasugerotadotovuz.pdf
    • https://remumalu.files.wordpress.com/2020/06/65273088730.pdf
    • https://pufexek.files.wordpress.com/2020/06/30533860456.pdf
    • https://movomuwur.files.wordpress.com/2020/06/weworu.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_off0000660b.bin
c59e2d24a1cd8376db22ec99a6e2ba383ce4b6365cd085cbeceab64178787cf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x660B 11124 bytes

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