Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f76aab812bf65ca…

MALICIOUS

PDF

79.8 KB Created: 2021-09-09 01:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dd6a5a4b51a8fe2cdcc8554510a08285 SHA-1: 83e25c97c342a6d49332bf226c09598279041fc3 SHA-256: 8f76aab812bf65ca73e4264fdfcf9696331f0a543bec74513c3540e178967bc1
126 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 disposable domains and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=how+to+make+whatsapp+restore+from+local+backup PDF link annotation
    • http://banglenhospital.com/UserFiles/File/lovom.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/77712928474.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/sezomewexenogojasuzod.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/kikakilalemusa.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/refatiwonakiri.pdfIn PDF document text
    • https://trystsalonri.com/images/file/vatofujeritiwulibuxit.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/xiboxanudi.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/vobojexezegatomiwurepeve.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/dipimoxexixovosupigano.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/zokodukal.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/sotimakukonisom.pdfIn PDF document text
    • https://diphong.com/uploads/sukitaz.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613927ddbdd7f---pejimikokapar.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/1ded56070d28863c1919352b135e2209/ludowane.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/2756758666.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/84163760290.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/75107653112.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/xumijekonogaguvijenu.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/57618910367.pdfIn PDF document text
    • http://ustunongel.com/image/files/nababos.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/42297659300.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/73303728308.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/vojuzad.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/dabupilero.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_off0000d3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FA 10956 bytes
SHA-256: 01220e2d65db13a600975d302186fdf152012e30a0b0a685001bc752988fd77a
font_01_sfnt_off0000ed3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3E 16824 bytes
SHA-256: a24891424dd36c3af0da8981ccea87980defb305e436183702adb68e724af486
font_02_sfnt_off000118d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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