Malicious PDF — malware analysis report

Static analysis result for SHA-256 47e8dc32ae962dc7…

MALICIOUS

PDF

75.0 KB Created: 2021-09-24 03:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6378bbd512f5cfdc42978eee1d9113a7 SHA-1: fd9d4007c4f230d216afe245729f76d1e03f86d8 SHA-256: 47e8dc32ae962dc7f84240d01951b7714139c1893076a2893cc767ff24977844
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on distinct domains, indicating a link farm or redirection strategy. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggests this malicious intent. While no scripts were explicitly extracted, the ML classifier flagged the PDF as malicious, and the structure points towards a potential initial access vector via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 4

  • 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://gornjastubica.hr/files/vogitalawamajomevo.pdf In PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/9331102093.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090709155273499.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/zibokixajorukujeve.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/95923155198.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/dexevixademekodavamokosi.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/zunob.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/6162892346.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210904160950.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/60348684403.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/85368366244.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/boreruvalo.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/4fa11498b6b9a6be6f1d0f3b7a0fc8f8/wosojalitirotejirowe.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/22795886043.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///31625375238.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/borozemaginuloper.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/87689720208.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/wudobexokaxomuzoxodijajew.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/lixanopalufer.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/gerazuxuse.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/jasatamirepejipojibivogi.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/67733954177.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/41775394103.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/gatevuz.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/46223088133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+twilight+saga+new+moon+123moviesPDF 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_off0000bd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD14 18504 bytes
SHA-256: ebd0acbf440527d885fb2e623a49617badbad235716e8009b24594cdba0a1e08
font_01_sfnt_off0000ece7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE7 10912 bytes
SHA-256: 22b94f760e8de88c3a43dc066b475999daf0cc37873e119abf3f5f1ab201a5a3
font_02_sfnt_off0001062d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1