Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1f7a4dd4049d6a…

MALICIOUS

PDF

65.6 KB Created: 2021-03-15 05:31:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: cc6278a264dd0219ce76e33eebbb12ce SHA-1: a334e9006167135f083a7493c89366e6730b306c SHA-256: ad1f7a4dd4049d6a56c5911b6ee6ad8e56f17f6ca21f9ac7eb80485047cc0672
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or trojan delivery. The embedded URL `https://jacksth.ru/strik?utm_term=biblia+original+hebrea+traducida+espa%25C3%25B1ol` is a primary indicator of the lure used.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8952

Heuristics 5

  • 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 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.
  • 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://jacksth.ru/strik?utm_term=biblia+original+hebrea+traducida+espa%25C3%25B1ol PDF link annotation
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    • https://s3.amazonaws.com/fosalizuzu/18334772679.pdfIn PDF document text
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    • https://uploads.strikinglycdn.com/files/8e9f3126-647a-496a-b643-2e1838849842/28669163008.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/tony_evans_bible_commentary_barnes_and_noble.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b06840f1-882a-4369-be71-b12453f7528b/gordon_ramsay_home_cooking.pdfIn PDF document text
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