Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1df65c3ffc82040…

MALICIOUS

PDF

73.0 KB Created: 2021-09-26 05:04:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 82eb43551753e60ee2b9977c396cd167 SHA-1: e7704b20750c3de553c6b63e55d23d40b789a705 SHA-256: f1df65c3ffc820403b6ce92a1378b021e542d06174629752e3d7c78b69c4a3cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm or redirection mechanism to phishing or malware sites. The PDF structure and embedded URIs are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://chcial.ru/uplcv?utm_term=the+longest+wavelength+within+the+visible+spectrum+is PDF link annotation
    • http://portalcom-b2b.es/img/user//file/_0167682001632251665.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613c647cc753b---wetik.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/lefozugadegosegiwixanedu.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/wufugiz.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/melaragerovolexerus.pdfIn PDF document text
    • http://zenithmetals.com/files/xowadeda.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/nukowew.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/ziwevegudopomosigujamugav.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/pozivi.pdfIn PDF document text
    • http://isgsrl.it/images/file/zunuw.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/pozovixo.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/c96dd28e25c97a01b74a106fc3b656b8/94663217360.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/47612869889.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/82280201094.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/wekapitiwelotegani.pdfIn PDF document text
    • http://istruttorecinofilo.it/userfiles/file/kirurorotereviximadet.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/47742963204.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109201410443383.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/37649501479.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/romowej.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/galisimawovetoketejovafu.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/68654245220.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/29946150295.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_off0000b584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB584 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD96 18140 bytes
SHA-256: 33ebcb1c871615738b5ad67038f7ec3440b4f0d020d7457763873089b7043412
font_02_sfnt_off0000fc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC06 11176 bytes
SHA-256: 53f38de43dad3550ec89ca50b9941ccd672e09565a8278be5d8dabf257b99248