Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8fa8dcb4f6c3f7…

MALICIOUS

PDF

74.4 KB Created: 2021-09-26 21:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fc30edb57b2a86fbecc889945c3781bb SHA-1: b68ac1533f2bfe47e61cd7f07259738c4d43856c SHA-256: da8fa8dcb4f6c3f76acbfdadf3ce59c1dec6dfbfd953b8794b741f41aedd63e6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple external URLs are embedded within the PDF, suggesting an attempt to redirect users to potentially harmful sites. The presence of numerous links and the 'link farm' heuristic strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/456a6c7d87b26016e94c03afd25aa74e/luruvaw.pdf In PDF document text
    • https://olboihorgaszto.hu/editor_up2/zewekelutero.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/11766580080.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/75458929603.pdfIn PDF document text
    • https://krossi.ru/images/content/files/mulorasomepe.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/66693664907.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161321265f20d7---vawupenotono.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/suwimasezuzak.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/zeloxole.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/86962291279.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/varoli.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/xopexebisuzefopogekaje.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/jeritevafizisedu.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/67131553381.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/patasufimakidixulix.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/loduboziraredegivododibi.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/xepojibilakuru.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/rudibenujepuxatadij.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16322057358602.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/fubakasotadovolegapuju.pdfIn PDF document text
    • http://coolbiotech.com/upload/files/viwawisodutegokeninezado.pdfIn PDF document text
    • https://badrivishal.com/media/16091957325.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/bewutorasopolonovitades.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=gba+emulator+freePDF 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_off0000bbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF3 10288 bytes
SHA-256: 6c34b19e5ad5d4b08db9fec208cb1cb7e9a7b603a0e62ddeebb133444419f88b
font_01_sfnt_off0000d329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD329 19028 bytes
SHA-256: fb86dc818ebad0fc95527e0c558ee7d7073514a738f72e87074181a2eb06beb5
font_02_sfnt_off00010493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10493 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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