Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed26127082a6422e…

MALICIOUS

PDF

80.4 KB Created: 2021-09-24 01:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 66c55c486b72ec458b0fb1317c8fea6a SHA-1: 01c0fb36fff60deb159b000c6496b90f7903b135 SHA-256: ed26127082a6422eab288d0f33fc121f81c297be9bbeba5f89fd4c3a2680b89c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or distribution network. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct hosts and links, reinforcing the link farm hypothesis. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mopubosuduvituzobude.pdf In PDF document text
    • http://automotiveenergy.cz/userfiles/file/27130757517.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/87132832912.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/22468986581.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/43361688581.pdfIn PDF document text
    • http://cartopack.be/Images/file/30218423033.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/95167250849.pdfIn PDF document text
    • http://topp.pl/_topp/file/78188780220.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/sodomazorujexusavufotuza.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/59326442295.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/sewefigidapotelina.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/76685790628.pdfIn PDF document text
    • https://stormester.no/files/file/gelomokifejugiwot.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/25918895059.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/xeriwutiwur.pdfIn PDF document text
    • http://sun-eko.eu/files/file/juwapat.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/vuwolosikodujo.pdfIn PDF document text
    • https://vzglavniki.net/data/file/78922865407.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210901133738.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/10316667314.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/jewiliwom.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/15582594527.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce62e05d0d---katudovagajelazuki.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/e3d6d68f37227fe60cd52d8191757f7d/monebupopimogasulezev.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/sabatepixaborufid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=minecraft+download+apk+16PDF 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_off0000d5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D2 17308 bytes
SHA-256: 51b3cef1ff4dcbf8d50107732b1556639c3d33b31758a74b99eb04569fbf49c9
font_01_sfnt_off000102df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DF 10836 bytes
SHA-256: 7869456d0bc50727dbafdafb76e76e00c804f5e612b5786bafa21d0abbbb0c3a
font_02_sfnt_off00011c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1