Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0db8b9b431b5468…

MALICIOUS

PDF

84.4 KB Created: 2021-10-24 01:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bc3e49aac0ac345d2135ca49fc79f60c SHA-1: 378e6b547617d2b102b55ab535a6a6fb60594fc8 SHA-256: f0db8b9b431b5468b3c020a7c564f8b5bd0039ee146fb821549ff9c58874a262
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and URL patterns strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=roguelike+adventures+and+dungeons+minecraft PDF link annotation
    • http://6nergy.fr/6nergy/sites/default/user/file/lawisapedilis.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/mobal.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/nedejujotisosiliw.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210929_19C5DB8F04F39F87.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/nomujuzovitemuximek.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/nerodorawizidusezajoxuzu.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/8fc10855e7683bf2cc656458035e6547/deripik.pdfIn PDF document text
    • https://mentormedya.com/files/nekimisevejilefunizotu.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021101610500163.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/guxiduv.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/2482163297.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/fajexujemunun.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/jokilirunonagilut.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630586124.pdfIn PDF document text
    • https://nppgursaraijhansi.in/ckfinder/userfiles/files/jufubuniwopexegaperefu.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/gekovuse.pdfIn PDF document text
    • http://contelex.it/userfiles/files/kejopipelabometalubojesa.pdfIn PDF document text
    • http://charontrade.hu/data/file/guviziwofizoselijolabujos.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091001235969.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/69329767217.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/libaw.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/piralazebesux.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614a238806063---tufasilupiruzuxavudixe.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631905394_1623e40718.pdfIn PDF document text
    • http://abcs.umontreal.ca/upload/files/56744446491.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_off0000e36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7E 17740 bytes
SHA-256: 775fa56faa4c8c9ed673c2cb13d314e13a42a906bf97330bd7f5fa81b96ab023
font_02_sfnt_off0001299c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299C 11124 bytes
SHA-256: 275070ef6b5da2c764f48bea298d411d9a56c894b5c96053bdae6053d5dcb556