Malicious PDF — malware analysis report

Static analysis result for SHA-256 871d7c7a7e8608c2…

MALICIOUS

PDF

42.1 KB Created: 2020-04-09 09:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9937aaf99bd59eb76137a59d83e19e48 SHA-1: 0af18cf2820af39d7816cd64798ffd57f97b54d6 SHA-256: 871d7c7a7e8608c2f492debf6d1cf476eb21b7e0bfe76026bbbef3775883f2ee
92 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to other PDF files hosted on similar domains. The document body, though partially corrupted, contains text related to 'Ejercicios de numeros cardinales y ordinales en ingles' and mentions 'wkhtmltopdf', suggesting a lure to educational content. The primary attack pattern involves redirecting users to a network of linked PDF documents, likely for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://chantaljeanpierre.com/uploads/1/3/0/7/130738909/130738909.html#ejercicios+de+numeros+cardinales+y+ordinales+en+ingles
    • http://aspirecycling.eu/uploads/1/3/1/1/131163863/lopuzeru-jovatexariv-fawale.pdf
    • http://campinabox.camp/uploads/1/3/0/6/130604952/e041826c9d1.pdf
    • http://debonteavond.com/uploads/1/3/0/7/130775350/vosiwojipiboruv_majuxevage_runonesup_wezojikutemawu.pdf
    • http://hairbyelliesiegert.com/uploads/1/3/0/5/130588390/9698321.pdf
    • http://thebestspicecompany.com/uploads/1/3/0/2/130289551/6e4423.pdf
    • http://besutobites.com/uploads/1/3/0/6/130604424/tovanigikoxupus-xulikusa-mejefuzubati.pdf
    • http://namdalseidmusikklag.no/uploads/1/3/0/9/130969090/4487968.pdf
    • http://goodfoodgreaterfredericton.com/uploads/1/3/0/9/130969185/lanun-vavimekujo-lozaduxa-dinuno.pdf
    • http://allisonnickens.com/uploads/1/3/0/6/130604032/purutanag.pdf
    • http://devereuxazkids.org/uploads/1/3/0/6/130620712/1755985.pdf
    • http://farm-art.net/uploads/1/3/0/8/130873872/1a953.pdf
    • http://choiceusinfo.com/uploads/1/3/0/6/130605292/9731aef26.pdf
    • http://charlottejackman.com/uploads/1/3/0/8/130874034/7823412.pdf
    • http://texasgymrats.com/uploads/1/3/0/7/130739446/6cea6e5.pdf
    • http://compassionatelivingcourse.com/uploads/1/3/0/5/130543980/dodesepanakebus_nunukok_jatazelexox_juxumomulate.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_off0000769f.bin
e6e7d31edceb1cfd98167c767b7ec681086e01a9fde9af7f26ed27a89cbe49fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x769F 9468 bytes

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