Malicious PDF — malware analysis report

Static analysis result for SHA-256 315234276b5162e5…

MALICIOUS

PDF

37.3 KB Created: 2020-06-11 15:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 196408521613cbeab90d9a27e82ff412 SHA-1: 817be9af73a910b6aa3893bbe213ffe423ff3e12 SHA-256: 315234276b5162e50c8d1b8c6e276a5c3ef8c81b9dbf42d4c5476d6e9aec5d7f
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains text related to 'Developmental guidelines for 4 year olds' and includes multiple URLs, suggesting a lure to a link farm or SEO manipulation scheme. No scripts were extracted from this sample.

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://ssaitravel.voyagerwebsites.com/uploads/1/3/0/4/130488152/130488152.html#developmental+guidelines+for+4+year+olds
    • http://magdielsfashion.com/uploads/1/3/0/9/130969186/zoxiba.pdf
    • http://eatsleephike.net/uploads/1/3/1/4/131406816/xefefidadaw.pdf
    • http://gat47.org/uploads/1/3/1/4/131406547/63540b.pdf
    • http://mail.grip-potential.com/uploads/1/3/1/4/131406816/7601723.pdf
    • http://carsonvalleycommunityfoodcloset.org/uploads/1/3/0/5/130551239/08545b49c7.pdf
    • http://smashtattoos.com/uploads/1/3/0/6/130640159/seremawoxobori_gakurozabugix_kepugexavesepeg.pdf
    • http://ngbrepairs.com/uploads/1/3/1/0/131070336/3377612.pdf
    • http://stratakit.com/uploads/1/3/1/1/131164387/vupiduvonideweji.pdf
    • http://hostmaster.whitstablefringe.co.uk/uploads/1/3/1/4/131409574/09f1c4.pdf
    • http://wenqi-luo.com/uploads/1/3/1/1/131164152/6764265.pdf
    • http://cpcalendars.serenityhobbies.com/uploads/1/3/0/9/130969185/83e91b430f99f0a.pdf
    • https://kemetax.files.wordpress.com/2020/06/gaxuxogutaburit.pdf
    • https://natebiwogu.files.wordpress.com/2020/06/70686262379.pdf
    • https://xipobofukig.files.wordpress.com/2020/06/fudita.pdf
    • https://vivusoxomeva.files.wordpress.com/2020/06/sotali.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_off00006656.bin
4a8a9c54f78e184acc21e4d99aba0a1d31b4922b78ea76a9816b9d7b8cde2d6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6656 10456 bytes

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