Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae4c8dbf5a6bb22…

MALICIOUS

PDF

53.3 KB Created: 2021-04-12 17:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 316aac4f6a62d8cffa829e972651e078 SHA-1: 813efb5af5f7f0bcba017a1bedcb9660bf350866 SHA-256: 7ae4c8dbf5a6bb22c3a03ae1acb7fd47d5028f627a651b881ac14641d93bce44
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6428

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seiary.com/sites/default/files/webform/rec/netugapufuzutazegiwiwivi.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/sojinikud.pdf
    • https://www.mainephilanthropy.org/sites/default/files/5296457674.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/3563422068.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/tojawi.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/jowodudarazobipadumalo.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/tasuwagorefovufozibojer.pdf
    • https://www.mothercare.ro/sites/default/files/webform/resumes/28941778760.pdf
    • https://ambrose.edu/sites/default/files/webform/85138354947.pdf
    • http://russian-ice-spb.ru/sites/default/files/webform/files/97818084314.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/wafawujozovu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=cartas+a+una+joven+matematica+libro
    • https://community.princeton.edu/system/files/webform/luzixuganigofifabeja.pdf
    • https://lib.asu.edu/system/files/webform/46247033309.pdf
    • https://drones.princeton.edu/system/files/webform/65601020807.pdf
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/37488496184.pdf

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