Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebe5a467a2731725…

MALICIOUS

PDF

38.8 KB Created: 2020-04-02 00:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f59eff88d5847609459ad480fbec2984 SHA-1: 31daea261390f94851d280378373fa5dbd081128 SHA-256: ebe5a467a2731725a5042563e5d66586f0040310a93b4ffe53be172ac10fc17b
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are dynamically generated and point to other PDF files. The document body, though partially corrupted, contains text suggesting a document conversion utility, which is a common lure. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm designed to manipulate search engine results, likely for hosting malicious content.

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://colonialreinvestment.com/uploads/1/3/0/6/130620168/130620168.html#taranm%C4%B1%C5%9F+belgeyi+worde+%C3%A7evirme
    • http://alliedhealthcareinstitute.com/uploads/1/3/1/3/131398077/vudekorigopeged_volar.pdf
    • http://stayviveproductions.com/uploads/1/3/1/1/131164077/9321439.pdf
    • http://sarafeatherston.com/uploads/1/3/0/6/130620549/1f813681ef10fb.pdf
    • http://lowcountrymobility.com/uploads/1/3/0/4/130488578/bolafilepadokuwakup.pdf
    • http://www.thesuccessfulsalonclub.com/uploads/1/3/1/4/131437516/dbe2e1bd75f7c.pdf
    • http://goodfindsatl.com/uploads/1/3/0/7/130740561/lidofuroxaruzob_badenakatojeto_fusirofobifu.pdf
    • http://sportsphotography213.com/uploads/1/3/1/0/131070579/87214.pdf
    • http://muziekkapel.be/uploads/1/3/0/6/130604373/xuvobutafozub.pdf
    • http://whitebisonbakery.com/uploads/1/3/0/6/130621075/ae4282a37.pdf
    • http://nectar-consultancy.net/uploads/1/3/0/4/130477661/58665.pdf
    • http://simplyamazingtours.com/uploads/1/3/1/0/131069934/fijuxamugoroso_pipisuwu.pdf
    • http://jacquieohsdc.com/uploads/1/3/0/5/130589094/sejodun-firogaxejekuk-sumabinolikozu-jizumeparosenid.pdf
    • http://trebermuda.com/uploads/1/3/0/4/130478110/cec8ada43.pdf
    • http://brokenarrowstudio.com/uploads/1/3/1/3/131379295/komarovamixowurader.pdf
    • http://wixomtowingservice.com/uploads/1/3/0/5/130588810/a18443d00a56.pdf
    • http://empathizeothers.com/uploads/1/3/0/8/130814831/norunok.pdf
    • http://austinkitchenbathdesign.com/uploads/1/3/0/7/130775056/ba3135b.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_off000069f3.bin
b28ad81126adfff480aab8a16ad28b87943903f9ab801e15855dab7f6287cad7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69F3 9816 bytes

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