Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21ccb8fe4ebd8e8…

MALICIOUS

PDF

49.7 KB Created: 2021-09-23 06:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4eb6314b511c906a48dba17c71e90d3b SHA-1: 135e589a2556d58e060070168d3da157c9290d50 SHA-256: b21ccb8fe4ebd8e8e599027871f885165d2b69bbc143a968ffe4d586fe99801b
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on potentially untrusted hosts. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure to download a malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9349

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 https://crysiq.ru/uplcv?utm_term=utorrent+android+save+to+sd+card PDF link annotation
    • http://abwlondonblvd.com/uploads/files/xodudupugelarapu.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/divobajurot.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/19326710427.pdfIn PDF document text
    • http://eternoohydro.com/d/files/jerapebegopile.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/takamomepox.pdfIn PDF document text
    • http://ubest.ru/images/file/13579009467.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/29181672964.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/87688234314.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8af0acea7---74730938506.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/navaneme.pdfIn PDF document text
    • http://thaide.org/userfiles/file/44401877956.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/84127385297.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16136c9514cb59---puzuvawodidurimumaripat.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/14613641237.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/jeluwaxiju.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/82611419260.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/xunozudojadarikuwoj.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/leterelobepi.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/gilufenawojisulabuvarux.pdfIn PDF document text
    • https://mbp.hastatis.com/mbp/upload/images/images/upload/ckfinder/51921454443.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/15834241677.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/xoleragebawodamom.pdfIn PDF document text
    • http://lindseyderence.comIn PDF document text