Malicious PDF — malware analysis report

Static analysis result for SHA-256 441b76426a8f163a…

MALICIOUS

PDF

66.3 KB Created: 2021-09-23 06:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 42a91dd3af712a4bb6c906a76810a7ef SHA-1: 56fc8376d5e38c90d1f245b301861aec409c54be SHA-256: 441b76426a8f163ab210a7666a19d3023329c295d09434b9bac5d578a4351c00
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs and heuristics indicate it functions as a link farm, with many distinct hosts and UTM parameters suggesting tracking or redirection. ClamAV detection and ML classification confirm its malicious nature, likely related to phishing or malware delivery. The presence of external URIs and the link farm structure points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9137

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.com/userfiles/files/pekovunorejavavinal.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD199 18152 bytes
SHA-256: 8813fc70362491b1ed19863884218d9702c7cbabf56352e4a48756b649eb8bee

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