Malicious PDF — malware analysis report

Static analysis result for SHA-256 d10d331aa4e3b2bf…

MALICIOUS

PDF

39.8 KB Created: 2020-06-07 02:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f84c19cd10656edbcb276b519125d5e0 SHA-1: be7b8b81f761155a970b67ef4249e0f989f3967e SHA-256: d10d331aa4e3b2bf7241304edbd07f16409ee304460d45b8eb211eb9d48fe828
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

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 flagged this PDF as malicious with high confidence. The embedded URLs suggest a link farm or redirection scheme, likely intended to manipulate search engine results or lead users to malicious content. 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://4p9.undesirable.us/uploads/1/3/0/3/130313524/130313524.html#paragrafta+konu+ana+d%25C3%25BC%25C5%259F%25C3%25BCnce
    • http://andytuckerphotography.studio/uploads/1/3/0/2/130287257/tigifedufibinudopaw.pdf
    • http://geleedegroseilles.com/uploads/1/3/0/6/130604447/2412603.pdf
    • http://shop.mtadamshoney.com/uploads/1/3/1/3/131380993/259a900e11.pdf
    • http://tclounge.com/uploads/1/3/0/5/130590312/9793598.pdf
    • http://camerongallant.com/uploads/1/3/1/3/131380273/fb0f096ec41.pdf
    • http://backbeatcomedy.co.nz/uploads/1/3/0/9/130969571/a87d811e.pdf
    • http://myfullmenu.net/uploads/1/3/0/5/130539881/ba39665fd626fc.pdf
    • https://tipubek.files.wordpress.com/2020/06/8136609430.pdf
    • https://powugukus.files.wordpress.com/2020/06/zutawakajegovaxodozolip.pdf
    • https://tijizukoveb.files.wordpress.com/2020/06/97973294935.pdf
    • https://dawedigukas920094907.files.wordpress.com/2020/06/95924885849.pdf
    • https://febibofopas72304249.files.wordpress.com/2020/06/vaxipimawazipabir.pdf
    • https://jetufaru.files.wordpress.com/2020/06/5243181927.pdf
    • https://wonudat.files.wordpress.com/2020/06/vobedeluditomulitaxirer.pdf
    • https://riwimatuko.files.wordpress.com/2020/06/lixuwemozaguxaxojavabub.pdf
    • https://nitufomujame.files.wordpress.com/2020/06/dadumavafapejezejofobaset.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_off00006f8b.bin
b1bbc471bff6e2191a02247cbb16d231eed7909eb345faa9f1aa6893fa8fb4eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F8B 10932 bytes

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