Malicious PDF — malware analysis report

Static analysis result for SHA-256 76949de9fe816f02…

MALICIOUS

PDF

72.7 KB Created: 2021-09-20 14:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: f38860cfcc88930e623f78d5fa501297 SHA-1: c96cae990b8591f933738e47d36b0d33acbd133f SHA-256: 76949de9fe816f026d916bfa3f21b31b7926a3e4754cf8984bbc760829e1e61c
134 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs and a heuristic firing for a 'download button' lure, suggesting an attempt to trick the user into downloading a file. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document's structure and numerous links point towards a link farm designed to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xuantruongtech.com/images/ckeditor/files/94703347604.pdf In PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/54355246740.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/0485794b39e29cea3d8d866d1e833bee/1028967796.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/54846470081.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/tujokosobegiwivafusexaje.pdfIn PDF document text
    • https://krafteco.ru/uploads/files/38277630306.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/ribigepegenibeduz.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/matixe.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/21603947206.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/54860165688.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/fukaxupema.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/18707836891.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/gatirikenonaxexotetiti.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/57833603454.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109151411528255.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/14907952624.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/tejosur.pdfIn PDF document text
    • http://etkenkalip.com/files/98571750254.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/29696805274.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/fuvuvosijozu.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/6105692010.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/62675298106.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/30212165714.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/a320469afa094a344eb25ead57b9dcf5/93423689427.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/bejep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=prince+of+persia+warrior+within+game+setup+free+download+for+pcPDF 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_off0000b8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B3 11252 bytes
SHA-256: fc022f910c8184b99436966aac0e5770f287e6d7f9f1555bd505a0bf1fbfe27a
font_01_sfnt_off0000d2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BC 16448 bytes
SHA-256: 18f832718d6ca52745217820571ee4f8a0a71f2899b61bf4b0961090475c5638
font_02_sfnt_off0000fc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1