Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc0b43bb0e93323…

MALICIOUS

PDF

83.6 KB Created: 2021-09-19 04:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 81730986267aef1d52f0126895e082a8 SHA-1: 1fe25f1d337e407a5b50f6cab37286fd396dcfaa SHA-256: ffc0b43bb0e93323c5053ef7b4c1a096667d8aad8083aedcac0394b81dc426c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=falcon+and+winter+soldier+123movies PDF link annotation
    • http://www.pvvc.cz/files/jeselugipurixufuxogujamu.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/givobosupaxaloxi.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/7a5bde1a4161e8fa5d95219b9843578a/83303328076.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/15139994937.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/54706729368.pdfIn PDF document text
    • https://pacientes.quiroser.com/UserFilesQUI/file/folaniluz.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/nevibikapukotiru.pdfIn PDF document text
    • https://camphacement.vn/upload/files/96245357845.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/9387865465.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/wateveda.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/jumosikilizebevumojed.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/jazubiz.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/24565201867.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/67770462325.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/bejik.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/gabagirilewiwonodu.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/kirafe.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/fewikedijezudivu.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/3403637583.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/bosexiwuvasi.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/bubilezugirinerepepizuti.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/6583120359.pdfIn PDF document text
    • http://posuni.com/userfiles/file/87005348563.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/43708216559.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/35369592938.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_off0000e1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AF 17468 bytes
SHA-256: d2e04a0c052a1d4a14090ed57f4382d9a62ca25c0f0e93c56fe40b2734f7749d
font_01_sfnt_off00010e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B6 11004 bytes
SHA-256: 0d8361e866ea2ec6aa12b2d118df59b233de1f05d7ae6d6d6e98d710d44da9b2