Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a013263b95d6c4…

MALICIOUS

PDF

75.0 KB Created: 2021-09-21 14:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 351df467b6d05549ac6398b992d5cd55 SHA-1: 34fb028a381f3cf68162ea15808e1ab0a4a812b1 SHA-256: d8a013263b95d6c4c213809b5c1eba1a69e56cedd3b1b4b9532a509434925f24
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use in exploiting PDF vulnerabilities or delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=cbse+class+2+maths+book+download PDF link annotation
    • http://vinacafe-dalat.com/Images_upload/files/jozumalatunefaxavulakimoz.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/13957730846.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/fupejovenilato.pdfIn PDF document text
    • https://guadix.co/ckfinder/userfiles/files/89420125180.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/86204946495.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/robekasosaxenigor.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/supem.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ananfgcvcr0qn6gv5flbbj6kr5/kurukevaga.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/22232915602.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/3577390632.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/55199560082.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eca6d7a766---55983442610.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/040512116518.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49842044736.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/komitozowupalululigujajak.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/82466544111.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/tavolubaxebu.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/xenazex.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/nukadasopusufexularage.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/vamokudunezipij.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/ketujiroviwedavusonabos.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/vizixubigolizebitewu.pdfIn PDF document text
    • http://shriramashramssschool.org/userfiles/file/75852826156.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021920157231201.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/rojimogiruvevozebama.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_off0000bb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB69 10912 bytes
SHA-256: 90287c2b736f8b822fe275f715ac8ae2b6e2c80ecba5343799444e5e7bc4b487
font_01_sfnt_off0000d4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AF 18944 bytes
SHA-256: c5e5d98ee8012444d5478b680b9dc81b6923c6c601ec41d98f6ffba4597004f9
font_02_sfnt_off000105cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1