Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a26b7751b9ee5a3…

MALICIOUS

PDF

70.1 KB Created: 2020-04-06 15:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ac998be38cf7605520e2f636ce888d09 SHA-1: 2d7953aa3987bcb11dd867119d533fe42331da9a SHA-256: 4a26b7751b9ee5a326d7a0788e46e52fdcc1a7ba310e19dd721a9fb6c3a5e526
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains numerous external links, a common tactic for SEO link farms used to distribute malicious content. The document body, though partially corrupted, suggests a lure related to creating a teaching practice report. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. No scripts were extracted, but the primary attack vector appears to be directing users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://instpastoralsocialwagha.org/uploads/1/3/0/6/130639123/130639123.html#como+hacer+un+informe+de+practica+docente+nivel+inicial
    • http://scottsdaleinhomepeteuthanasia.com/uploads/1/3/0/6/130604233/7d1211f43faf.pdf
    • http://zamorayogawellnessretreats.net/uploads/1/3/0/7/130740130/sugomanibem.pdf
    • http://sellsla.net/uploads/1/3/0/6/130604508/eb769ea6a.pdf
    • http://metromedicalmassage.com/uploads/1/3/0/4/130483407/7744449.pdf
    • http://cadeirasonline.org/uploads/1/3/1/1/131164039/923486b540e7e5.pdf
    • http://angelicapelegrin.com/uploads/1/3/0/2/130271057/33014b8093.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_off0000e723.bin
8c77a57279c5dbba94ec70774033d8bc7641eb37d5ba0a3fbe91027b7bea353a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE723 9528 bytes

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