Malicious PDF — malware analysis report

Static analysis result for SHA-256 4871f99290f552b2…

MALICIOUS

PDF

40.9 KB Created: 2020-06-11 18:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a346672f579ad2ca4781d4fd85f36052 SHA-1: 11fce03fd749a27352e9884c7f11d2cf9bbd8805 SHA-256: 4871f99290f552b2aa26d55921c5b80b74065ae4c286673f0acda548ef7122ed
92 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 to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly supports the malicious verdict. No scripts were extracted, limiting the ability to determine specific payload delivery or execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 3

  • 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
  • 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://markinthemiddle.org/uploads/1/3/0/2/130288316/130288316.html#wilt+pdf+espaol
    • http://oleoleburritoexpress.com/uploads/1/3/0/6/130639141/sijuroto_miwugoxoje_lakipuzamuki.pdf
    • http://knowyourthoughts.com/uploads/1/3/0/5/130588477/mowawilaf.pdf
    • http://jinmumianbaijialeyoujiama.br3h.com/uploads/1/3/0/5/130590278/wetuzaxub-gafaxon-vixolose.pdf
    • http://montgomerytattoos.com/uploads/1/3/0/4/130490875/d7d1098d8a43f2a.pdf
    • http://taystails.com/uploads/1/3/0/6/130620710/zevavelagu_fupuwojonexozo_takox.pdf
    • http://easyclicktoearn.com/uploads/1/3/0/5/130551729/16b351a539dbc.pdf
    • http://unknowncrits.com/uploads/1/3/0/8/130814083/xebufanix.pdf
    • http://starspangledbabe.com/uploads/1/3/0/8/130813601/8867b9bf7.pdf
    • http://cpanel.ashleymartinportfolio.com/uploads/1/3/0/6/130621720/vizakitukanolo.pdf
    • https://miteduxom.files.wordpress.com/2020/06/13968664578.pdf
    • https://fenazudedo.files.wordpress.com/2020/06/83049896229.pdf
    • https://levejen.files.wordpress.com/2020/06/vunizukizekimigalumireva.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_off0000748f.bin
e0ceb1195d540d16f7f94b91b6ea202863bd2e02d9baf3c0bf5c44f6ebd99614		 pdf-font-stream PDF embedded font (sfnt) at offset 0x748F 10636 bytes

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