Malicious PDF — malware analysis report

Static analysis result for SHA-256 4506b11f55843a40…

MALICIOUS

PDF

69.9 KB Created: 2021-09-24 18:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b6bc1cbde9ce4c49afe19871f8112b5a SHA-1: 7710ee2404b4205e53803b1ecc551343fc22205f SHA-256: 4506b11f55843a40111dff69ee0a0a0b373d7dfe4e407534559bbe6a32e1d08b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant number pointing to disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the conclusion that this PDF is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/fe7ebc4c1c587faeca0fad4b47078c61/nejawepiveme.pdf In PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/72203882338.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/tawofet.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/91490886020.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/90101689491.pdfIn PDF document text
    • https://foulardfotografando.it/file/96779901475.pdfIn PDF document text
    • http://zuche0551.com/upload/file/botisexilububifabiwanufud.pdfIn PDF document text
    • http://fnathservices.com/upload/file/10446857038.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/dutuzekuwililexinor.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/68136961447.pdfIn PDF document text
    • http://htwy.com/upload/file/tuwisu.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/163219053822592178279.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/61526423397.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/14222252033.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/nuxaturudage.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/54816380878.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210907_89C7E3623E9893DD.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/jiwokuranojidugoxudu.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/nozazakinuxijofejadozup.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/rorapogakaleterufula.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/futaroluvubiporetepat.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/2f3fd77ee11ce696ecf2331f06ecfb92/gigimujopuwuk.pdfIn PDF document text
    • http://wirheiraten.de/images/file/47139594515.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/bamujibivege.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/40666095350.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/mepugusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=game+of+life+rules+2020+pdfPDF 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_off0000b21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB21D 15508 bytes
SHA-256: ead07b1f3f4d26561e225d20c5accf5c814b288f6885579cf21a0820885a2698
font_01_sfnt_off0000d924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD924 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13B 10836 bytes
SHA-256: f484b5e2a8c0d669e1dbcb3e2639b489d0023bb78e89bc00ed34adb00d079e24