Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91f69913f24d223…

MALICIOUS

PDF

17.8 KB Created: 2020-04-07 22:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1b82a28e2146bc5f791aab1c8665ddd7 SHA-1: cb9e8579452ec30d47bac9d4c8f1ae1e50271130 SHA-256: d91f69913f24d223f70d97046d628a15f349bc9c6305ad05d9b08fad6dc252ca
112 Risk Score

Malware Insights

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

The PDF document is identified as an image-only lure, typical for phishing campaigns. It contains numerous external links, suggesting a link farm or redirection mechanism. The primary URL, http://pullmyheartstringsviolinista.com/uploads/1/3/0/4/130483393/130483393.html#enfermeria+materno+infantil+libro, is likely the initial point of interaction for the user. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9696

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 17 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://pullmyheartstringsviolinista.com/uploads/1/3/0/4/130483393/130483393.html#enfermeria+materno+infantil+libro
    • http://shirahstern.com/uploads/1/3/0/5/130543280/sabotibafenegozize.pdf
    • http://suncom.us/uploads/1/3/0/7/130775171/vodariferari.pdf
    • http://pguzzone.com/uploads/1/3/0/4/130488694/f781b8a3b42ae.pdf
    • http://karlek.kitchen/uploads/1/3/0/4/130483680/4868186.pdf
    • http://fpocharity.com/uploads/1/3/0/5/130544746/jijexixan.pdf
    • http://specialblendsseasoning.com/uploads/1/3/0/4/130476485/9b6753d5158.pdf
    • http://hotgirlsofamerica.com/uploads/1/3/0/8/130874090/5516941.pdf

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