Malicious PDF — malware analysis report

Static analysis result for SHA-256 b03bc1fe98b390b3…

MALICIOUS

PDF

86.5 KB Created: 2021-09-22 13:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6477c51dcd6b3c2f03804df362230a42 SHA-1: 8522acac9f1ee5acef81b57b87b3d0785dfbefe0 SHA-256: b03bc1fe98b390b31e61fcda2d28b656cccfb279d607d8e81ff6ab4c6e3b5a17
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for link farms and phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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
  • 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://allytemp.ru/uplcv?utm_term=offline+farming+games+for+android PDF link annotation
    • http://space-edge.com/upload/files/riminososaxibobeviwotobu.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/43523618669.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/vevefosuvudiribu.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/37068777480.pdfIn PDF document text
    • http://cosyromania.com/media/file/82170319937.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1631785761891030149.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/gifegopevukeb.pdfIn PDF document text
    • https://ccar.host168.com/data/fckeditor/files/gefoxarulapadubarofojo.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/mudaxek.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/fesedubitoxebuvoket.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/bavirebadesavu.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140a11bbcd43---kovuvevuxuduvipexugi.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45575795777.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/18795544750.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d7e99e463---fenutizuwejulowajen.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/11771879695.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/dasaduj.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/ximil.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/97429634951.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/fuwiliv.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/50002212929.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/47110390940.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/vonuzusozakupidojudesoduv.pdfIn PDF document text
    • http://proxima-online.it/public/file/34361167967.pdfIn PDF document text
    • https://mar3ol.com/Files/files/45777210746.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_off0000f123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF123 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001093a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093A 10624 bytes
SHA-256: e3d7e5ea5e102dbd5086777eeba6cb0ce858a37dc33a8e5ea8163edf4b5e3fe6
font_02_sfnt_off0001213a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213A 16484 bytes
SHA-256: fd6c7dee3ea74c2e0572a0e31c5229b6a689307fcd04ab5e28d1cb06446feb2b

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