Malicious PDF — malware analysis report

Static analysis result for SHA-256 442373fda0880138…

MALICIOUS

PDF

30.0 KB Created: 2020-04-06 14:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: aa9e86e4b2a9c298f47c6d64c195bf5c SHA-1: a0216cfa393e0bb160f4f9b10951d5e6589253ff SHA-256: 442373fda0880138c25783631dbba7ae71787dcf277bc991d878c15227dd6217
92 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, a common tactic for SEO poisoning or distributing malicious content. The document body, though partially corrupted, includes a URL that points to a page discussing how to print an array in PSeInt, suggesting a lure to a potentially malicious website. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm.

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://1890joyridgeroad.com/uploads/1/3/0/4/130488098/130488098.html#como+imprimir+un+arreglo+en+pseint
    • http://grandviewmentors.com/uploads/1/3/0/8/130874097/8935612.pdf
    • http://lakewoodeventplanners.com/uploads/1/3/0/2/130289692/801527bd4.pdf
    • http://gweministries.com/uploads/1/3/1/3/131379506/0be141c12ae2c.pdf
    • http://georgiareading.org/uploads/1/3/0/7/130738531/marirolalipose_pemudagibuzeluw.pdf
    • http://chefcolt.com/uploads/1/3/0/8/130874376/f52caff2.pdf
    • http://coloradogrilltex-mexbbq.com/uploads/1/3/0/6/130604804/lupelexaroruni.pdf
    • http://gowebgo.nl/uploads/1/3/0/2/130270836/rekagelenufimi.pdf
    • http://accdigitalportfolio.com/uploads/1/3/0/5/130589108/a8e5a66733f.pdf
    • http://bourbonblast.com/uploads/1/3/1/4/131455475/vagixiwonefed.pdf
    • http://tamarasegal.net/uploads/1/3/1/4/131452872/7354ad52.pdf
    • http://zcoachworks.com/uploads/1/3/0/6/130639791/4059570.pdf
    • http://stacysdogtraining.com/uploads/1/3/0/3/130313468/nevopaxodono-lovupip.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_off00004f7a.bin
1f7b49384eaeb8f644464944e97b67dd1ef443fb5c6042189eae7bf34f398460		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F7A 7032 bytes

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