Malicious PDF — malware analysis report

Static analysis result for SHA-256 72924015beabf55d…

MALICIOUS

PDF

76.2 KB Created: 2021-10-07 00:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 087fbc5b2f76707dc2c8d6340bf1381f SHA-1: 8f37ce71c7ec9683b7b334554e7932e60b6b84ef SHA-256: 72924015beabf55d0d851c4c620e27aced970fde94c90b0bc4e0e12b04c83605
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a redirection chain to malicious sites. The PDF structure and embedded content are consistent with attempts to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://synerhu.ru/uplcv?utm_term=fbr+to+mp4+online PDF link annotation
    • http://droneducational.com/admin/userfiles/file/merivajifamis.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20211007050817.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/sokemavisejinovovufexebeg.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378f274c8c9---dotixosuzisaliboj.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/56254421695.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/talevalasezoxixijoza.pdfIn PDF document text
    • http://pololanna.com/user_img/files/matenajatekabe.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/rebamerujoxomokerepok.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/tabolijuguderusitogenu.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/41424030187.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/638921243.pdfIn PDF document text
    • http://somogroup.vn/ckfinder/userfiles/files/gevelekedofa.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210906033202.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/57862375609.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/duvurebijuvusuxudajoluzuv.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/83007664503.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/nipevebanunewus.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///64778103674.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/godiwunug.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/67806759832.pdfIn PDF document text
    • http://www.agot.pl/upload/file/79034209602.pdfIn PDF document text
    • http://budka39.ru/files/38417762077.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/mopobefegixaxijegu.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161408d6c8e16c---kutakolobopipeduruxupak.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA00 18944 bytes
SHA-256: b245fed4c340620e1144b13590370c38056d43cee8aaccb16bc2716c4df603a1
font_01_sfnt_off0000fbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FB 10280 bytes
SHA-256: 284620feef1ac8a0917a5dde40b6aeb695cc45bffe3d016075f50c26f78216a5

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