Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e18fe151188408c…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 21:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2a68b09ca993b2421f8f53bedf66577a SHA-1: 2b9ed576d9d1a876e4839b9d45811aad47a5b2cf SHA-256: 8e18fe151188408cba0e31146e6687fdfc94c1a435ec8277bf4ae9fe567643e3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=download+stick+cricket PDF link annotation
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/zevenipitagitisaxiwupap.pdfIn PDF document text
    • http://byecook.com/ckupload/files/wufitopupemawibimiru.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/sezixutezulozoveseru.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613921f114f61---navesuda.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/lokak.pdfIn PDF document text
    • https://noventa.cz/media/files/file/80425015401.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/refaziz.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/riramoxenumekaluxu.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/36758278026.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/26397848319.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/29469009938.pdfIn PDF document text
    • https://www.aillant-sur-tholon.com/ckfinder/userfiles/files/32993926724.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210912194225.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/sikesafizozapuwip.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/zogowuvazafubefezemenemi.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/51923676974.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/tefugoburirabisemuse.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/5134187050.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/23523521410.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/62264818842.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/81310444870.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/69305409803.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/62947170876.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/19206807604.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/a2c41f2a055dc1b2739c967e5e0e78c9/zifojofebibuvenod.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_off0000d833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD833 16644 bytes
SHA-256: 71ecdc0a33bc460dd18f90b9bd943bb2a0d70c33181d71e112092033d6a1547b
font_01_sfnt_off0001038e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA5 10544 bytes
SHA-256: 6cc394537c3d8de0120537163f5babae159f9bf4ed1e039adae6999a8ca1ad1a

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