Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe6c037204ac234…

MALICIOUS

PDF

82.3 KB Created: 2021-09-10 23:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 145f0583462000915aad7f9f64864198 SHA-1: cfc54954736c398388b219144b15db259003d3e5 SHA-256: bfe6c037204ac234f937176dddb99f18c4c9b351ec46ab9053fa44bd8c698d77
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the suspicious nature of the URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://starroadchina.com/userfiles/file/gifogopumukubigujudil.pdf In PDF document text
    • https://mmtours.si/uploads/reromurowebowogafasowolo.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/67952638014.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/tonofenikijaw.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613108be4d368---segexosokuto.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/rolomamojamovuleroxa.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/xurazas.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/visonigenuwo.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210905203524.pdfIn PDF document text
    • http://uhorder.com/upload/files/1478691801.pdfIn PDF document text
    • https://shidoremicrosys.com/media/kapavewimemopebudi.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/watuzijewerowe.pdfIn PDF document text
    • http://headrepublic.pl/images/files/45676461205.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/16485194776.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/zulugunozo.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/80305097079.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/60051401757.pdfIn PDF document text
    • https://maymac.info/userfiles/file/14037556845.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/82766222489.pdfIn PDF document text
    • http://grabnerestriche.at/xemigeju.pdfIn PDF document text
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/runasidonudaruwozewa.pdfIn PDF document text
    • https://digireg.es/upload/buwiwajenikuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+use+phone+as+writing+pad+for+pcPDF 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_off0000d94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94C 11028 bytes
SHA-256: 489a5eec8956df1d4f7ac4bd9e4a33adfa9aebaa406a5e27d395ab81e3e4001e
font_01_sfnt_off0000f2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD3 18756 bytes
SHA-256: e1353286ba1fbf5d834532d9c16ab34bc94067a96a68cb78ed091d6fbe1b2d3c

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