Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e9a8ad0fab76aa8…

MALICIOUS

PDF

72.3 KB Created: 2021-09-24 03:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f09069000045a021675db6dc9339db5e SHA-1: 20b3a7d7d24289684eeef6e26aeef2d34d254d26 SHA-256: 9e9a8ad0fab76aa8d5ca1b5f7431ded3d4f4389ab33aee490ea74ea87582cdd7
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially malicious sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The presence of 'utm_term' parameters in URLs like 'https://irlanc.ru/uplcv?utm_term=roblox+free+robux+generator+2021' suggests a phishing or scam attempt, likely impersonating popular online services to trick users into clicking the links. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8434

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://irlanc.ru/uplcv?utm_term=roblox+free+robux+generator+2021 PDF link annotation
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/84163175832.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/rujuvikitizezokowojemo.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/10739028547.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/wixibikoxisiliwefedejonas.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/gobazasiseviluvi.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/91694894393.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/56440766790.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/51538966732.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/e7345dfnt9dvp14tup8313icmn/62936856561.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/woxekinawuxudamujiri.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/45122124267.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/55091699172.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/16381618466.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79717373111.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/4728971422.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/57357465288.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/nukavegaduxe.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e71ab7729b---80859487358.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/28184591192.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/41552263759.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/14303210038.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/lives.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/vuzuzumevapakowarib.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/23261193443.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/wusapavisotenasuri.pdfIn PDF document text
    • http://belean.pl/userfiles/file/56300054262.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_off0000e983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE983 19232 bytes
SHA-256: 5d7d96f846ae457252f47d31b86e2fe3924e5013b2c96707a51989616a282371

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