Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ae08cae07785ad6…

MALICIOUS

PDF

58.2 KB Created: 2020-06-18 16:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e4c1ce7da1f34da573235cfdaed971e SHA-1: 2570358aa8c797f71f288f9e3db59b8991d767a8 SHA-256: 5ae08cae07785ad616077b5f792f7bbbf25961b45e41871c2eb17efd3aef9522
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the presence of multiple PDF links suggests a link farm. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://alexisnicole.blog/uploads/1/3/0/7/130775137/130775137.html#world+english+3+workbook+answers
    • http://mail.frenchtwistboutique.com/uploads/1/3/0/7/130738636/2692507.pdf
    • http://mta-sts.mail.davra.lt/uploads/1/3/0/8/130813644/nokogodobuvidonu.pdf
    • http://couplesws.com/uploads/1/3/0/2/130291975/da72a1e.pdf
    • http://riderinthemist.com/uploads/1/3/0/4/130476573/netimupurexil-tupatudib-pidosimixok-xulazetewu.pdf
    • http://hostmaster.questgolfacademy.co.uk/uploads/1/3/0/7/130738778/zipipobidogunerog.pdf
    • http://fs13kl.bdgct.com/uploads/1/3/0/6/130620430/7314948.pdf
    • http://techforgood.biz/uploads/1/3/1/4/131406071/zivamelawu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009044.bin
739825e856f34281449f8869a678b8306ecdbfc36e70f61caea61255e2cff418		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9044 5268 bytes
font_01_sfnt_off0000a230.bin
533a617cf9b9c84de6a01feaaa6895bf85539369dbd8a67eef83c6b7ef40b522		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA230 10928 bytes
font_02_sfnt_off0000c7ba.bin
4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BA 16060 bytes

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