Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e821fd5c96d214a…

MALICIOUS

PDF

63.7 KB Created: 2021-04-15 01:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 765cbdeeaa584afc28da5517391f0162 SHA-1: ef464a419ae35337ab649f1a0518aaaa5eba7b31 SHA-256: 3e821fd5c96d214a55ef94d4dc2eb2140c3306ec046f929b5f7193b3d9d4cdc2
64 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 potentially malicious domains, suggesting a link farm or phishing attempt. The ML classifier strongly indicated maliciousness, and the presence of external URIs and a link farm heuristic further supports this. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9514

Heuristics 3

  • 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 https://www.jsif.org/sites/default/files/webform/rijuluzevowogadabiwi.pdf
    • https://www.jts.org.jo/sites/default/files/webform/96043924660.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/bemefunojupupik.pdf
    • http://russian-ice-spb.ru/sites/default/files/webform/files/40307308503.pdf
    • https://www.cdcplumbing.com/sites/default/files/webform/contact-us/sawifujemenolezaf.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/87762274679.pdf
    • https://www.mainephilanthropy.org/sites/default/files/nikosomonebazi.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/zozagosetimof.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/32675510575.pdf
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/95859103094.pdf
    • https://www.visitsavannah.com/sites/default/files/webform/59391310887.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+pair+my+skullcandy+bluetooth+headphones
    • https://www.vub.be/sites/vub/files/webform/43319512550.pdf
    • https://printandmail.princeton.edu/system/files/webform/zupedofijemurak.pdf
    • https://gradfutures.princeton.edu/system/files/webform/49692556615.pdf
    • https://printandmail.princeton.edu/system/files/webform/98467125123.pdf

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