Malicious PDF — malware analysis report

Static analysis result for SHA-256 c268eb4d4dd817a1…

MALICIOUS

PDF

74.3 KB Created: 2021-09-18 17:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 60765dc4cb31747b2cf9b12106921b9f SHA-1: b6cff46d3674a316b70148310194e6375ac16b5c SHA-256: c268eb4d4dd817a100d9ed0e143d1b35b039868c03e629a41b89cf438a07d93f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs pointing to various domains, suggesting it's used to redirect users to potentially malicious websites. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=scratch+lessons+pdf PDF link annotation
    • http://pitin-akutsu.com/js/upload/files/zarakalajawuxugijuwodu.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/51139344622.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/50490012093.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/3970365999.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/b1gm7c9ugb45rvojpdtr9rgck4/29059323425.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/dezonex.pdfIn PDF document text
    • http://weldingplaza.com/files/file/judejapebipe.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///19724991332.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210903014650.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/25255411174.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/duneduferulerarav.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/81775701721.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/bobetananojof.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109110447057045.pdfIn PDF document text
    • https://emenu.hu/editor_up/pexojat.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/30302032620.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/zuxoposa.pdfIn PDF document text
    • http://pasaru.com/upload/files/mujevokalabe.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/sevuxedilis.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/vefupobinolol.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/60207639619.pdfIn PDF document text
    • http://centronegozi.com/public/78725185285.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/62227588660.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/19856486364.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/kofojojosa.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_off0000bf43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF43 10700 bytes
SHA-256: 5fa3bd74bfb7035b7b7a65edbf00061be6f58c8fe7605c9c0a30d0ca279470ef
font_01_sfnt_off0000d7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BE 16828 bytes
SHA-256: cc3384510adc2e283d5abcf831787c2fc3f6d30a50e1711d7ee0627ce13cd2ca
font_02_sfnt_off00010381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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