Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb9e7b1396d92540…

MALICIOUS

PDF

64.0 KB Created: 2021-09-24 02:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c643f7a5f7fe150af83240204f9cd5a2 SHA-1: 09018dfbe2486e717b327ecaa2f47562372b4a65 SHA-256: fb9e7b1396d925406079fe155cc54d39c90e87c2523ec5fc19c4d5a97781d3bc
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the structure suggests it's part of a phishing or malware distribution chain, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5438

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=jn+pandey+constitutional+law+book+pdf PDF link annotation
    • http://moriefrusca.com/userfiles/files/zitatedesatibege.pdfIn PDF document text
    • http://jaqalsports.com/files/file/sibotumokesu.pdfIn PDF document text
    • http://dgkno.cn/upload/xelogemaxol.pdfIn PDF document text
    • http://tzsunup.com/upload/38901103889.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210919221821.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161470d9fca82d---92549951780.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/59054903840.pdfIn PDF document text
    • http://vinmexindia.com/uploads/89613065330.pdfIn PDF document text
    • http://profstil.az/userfiles/file/liwafimupedubetituwogifu.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b13d6f6b4---seveninuv.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/41095758513.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/waxebizuzukikisesevepin.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/fotigapeluduli.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/wemejevosogumapelat.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/rekipawakesitokisepi.pdfIn PDF document text
    • http://datcat.vn/2018/file/43435633979.pdfIn PDF document text
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/desewakazigexud.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/dexomosomudivotixugawuv.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/sonapikeruk.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/26644209240.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/8797125805.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/sozuxewiponabupaxuzu.pdfIn PDF document text
    • http://cataga.de/beta/files/file/29162999871.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/44370326839.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/74173875029.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/gugitulazifitux.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1631774642.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_off0000d979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD979 11036 bytes
SHA-256: 68ebb3f266bf2fadc802aa6e7a4d994d8ec6cd77b7b7d112f49ef28fb2c9345c

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