Malicious PDF — malware analysis report

Static analysis result for SHA-256 f74b03c79dce9ca2…

MALICIOUS

PDF

82.1 KB Created: 2021-09-20 21:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 78ad2195c8de7c2e983e29346147464d SHA-1: 00d071870bcbfdf24edb58d63e3273dabf750344 SHA-256: f74b03c79dce9ca2c1a99fa269f7704c62ba3865ce439d74f0a3840673beb6b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links pointing to various domains, many of which are likely disposable or used for link farming. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=monster+legends+hack+unlimited+everything PDF link annotation
    • https://pomacanthe-art.fr/imagebeforeafter/files/46674649410.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/61393769494.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/28739898013.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/59717972426.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/53645947493.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312a266635b---22010500178.pdfIn PDF document text
    • http://sentralperdana.com/file/dufusogibat.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/mevuwan.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/gopaso.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/3977696477.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/59543166461.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/319261281.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/moxapilimajobugi.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/fugedababipox.pdfIn PDF document text
    • http://lgassociates.in/uploads/67857635027.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/zedurapud.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/wolewadofikevozidelopogu.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/71664121063.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/8679407133.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/94255407595.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/kimof.pdfIn PDF document text
    • https://lazerom.pro/media/file/69290684335.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/wumowomegotapibaputomo.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/161313556b9c70---53713713797.pdfIn PDF document text
    • 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_off0000d9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FD 11180 bytes
SHA-256: c81ff44beb4157ad40ba168c281a8ceb79adf63bc6f6ca09be706de75999487e
font_01_sfnt_off0000f3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE2 17996 bytes
SHA-256: 5a7ab5018fb63c784db2b1eb01946d2b1b3ce8516e45442b95ece5de91614de4

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