Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ba59162edac6cc…

MALICIOUS

PDF

84.9 KB Created: 2021-10-19 14:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0bf90016d456bb93f1ed18560f323d78 SHA-1: 39ce9c4c2b323c5be43ac608fab936be70a22773 SHA-256: f1ba59162edac6ccdb9605bdd7e3b5d63a791f96f1d616d7b2002d713e3c7737
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to disposable domains, which is characteristic of a link farm designed to obscure the true destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent. While no scripts were extracted, the structure and URL distribution indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://botosani.ro/img/uploads/file/91602302356.pdf In PDF document text
    • http://shengnabei.com/uploadfile/file///2021092906522828.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/15333132925.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/45725942148.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/mobok.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/tobuzudebafidatovu.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/15547616551.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210921040742.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/wolakojipubabojove.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/22937602794.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361adb608ef---turilipetugifedifizut.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/nabafapijisaw.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/6179733494353b820ffba49c24649ff8/towenazisisixawedat.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/watapane.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210919082155.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/mubawokolaraniluxubegizo.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/80849664934.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/69922336754.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/piwizuxamem.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/vibovujovaposuzosa.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/96121990351.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/xegokilusoraz.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/46165983802.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/HTGXzuRVGb4/uplcv?utm_term=pakka+local+hindi+song+mp3+downloadPDF 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_off0000e671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE671 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE88 10984 bytes
SHA-256: ef580d68ffe22e7869e693ff5b8809918d4ec1ab200ae1b4316c25882fc0d2e5
font_02_sfnt_off000117a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A9 18108 bytes
SHA-256: dfc7dee5a6f6070d4fa1cdd1a109ba4dc22d779f5047ec40ba3636f4b5a3ef94