Malicious PDF — malware analysis report

Static analysis result for SHA-256 7922e89cae844ad2…

MALICIOUS

PDF

16.5 KB Created: 2020-04-02 12:39:11 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2c7571e0c999d4e27fcdd5ac7f1e2b5d SHA-1: 1c69b540008c6a38c40b3d130f6c254b1a2c04bc SHA-256: 7922e89cae844ad275068cb502a2383c77941b87736b3363302cd4ad3a478109
114 Risk Score

Malware Insights

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

The PDF file is identified as malicious by an ML classifier and exhibits characteristics of a phishing lure, presenting itself as a free practice test. It contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The primary lure URL is http://blairthielemier.com/uploads/1/3/0/6/130620878/130620878.html#download+free+ged+practice+test+pdf, which likely leads to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 16 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://blairthielemier.com/uploads/1/3/0/6/130620878/130620878.html#download+free+ged+practice+test+pdf
    • http://headtotinytoes.com/uploads/1/3/0/4/130488974/zifadumeniboj.pdf
    • http://kaydumedia.com/uploads/1/3/1/3/131398176/e71c4d7c.pdf
    • http://tinderboxceramics.com/uploads/1/3/0/2/130288909/lugazid_nifepo_pasax.pdf
    • http://supportrequesternauth.info/uploads/1/3/0/3/130323635/luxuzepurixapadoj.pdf
    • http://astridbadell.com/uploads/1/3/0/2/130289754/ganofawa.pdf
    • http://copperstillsband.com/uploads/1/3/1/0/131070376/ea4ec58606.pdf
    • http://toolspoolsandrenovations.com/uploads/1/3/0/6/130620712/fceace6674e40.pdf
    • http://connectionsthrucompanionship.org/uploads/1/3/0/6/130621651/werukufugojamup.pdf
    • http://woodstockdhp.com/uploads/1/3/0/2/130288492/fozorejelekuxow.pdf
    • http://reedhospitalityassetmgt.com/uploads/1/3/0/6/130604958/5205178.pdf
    • http://ecosensekids.com/uploads/1/3/0/8/130813025/nowox.pdf

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