Malicious PDF — malware analysis report

Static analysis result for SHA-256 546e81a57c6c3b03…

MALICIOUS

PDF

93.2 KB Created: 2021-09-12 22:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f2e345c30ec83f652038b7a794505ee3 SHA-1: 426646daafafece3816446f3a53ea8c9b93e790f SHA-256: 546e81a57c6c3b03ca21e6be3331a3340c5fcec92c5686f0d0d5e1d2d9fbeafb
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URIs suggest it's intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 http://7166867.ru/ckfinder/userfiles/files/rikiwoginutasixe.pdf In PDF document text
    • https://itchanoi.vn/uploads/news_file/66563246243.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/xegobimiserowafulojularaj.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/milidolizawupuwij.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/nujit.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/xewoligiga.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/17261931519.pdfIn PDF document text
    • http://hingliltd.com/userfiles/lilaxepogigexiko.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/bivabakovurorogovikagu.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/vuvoj.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/44964766883.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/vodivugukobowan.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/59amtnm5agjefo7opbc4hu0g3n/56080148524.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/novavugup.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/fukomirulagavazusa.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/51911396896.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/rigiki.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327550c6a84---xixoxem.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/junosikopoluge.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/medavexikawasojuforemerer.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/sedezafozagit.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/36321756433.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/46231120012.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/16455231759.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/tobopepinivoled.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/mateje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=her+son%27s+secret+full+moviePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off00010875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10875 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001208c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208C 10524 bytes
SHA-256: d0a2829a2b1222378231313b1227a78806d1d3d62e51a12d98bb92322151a1ee
font_02_sfnt_off0001388a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388A 18128 bytes
SHA-256: c83766bd52a4cee82a2c3d3bea3717a47ba88596e6fd275f4e90ffe78214c074