Malicious PDF — malware analysis report

Static analysis result for SHA-256 833ea48217dc48d8…

MALICIOUS

PDF

81.2 KB Created: 2021-10-11 01:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d467c9c8037f6698c0c409a2e8d2a413 SHA-1: 0175d6dcaa0619368a0d2a67bc11d76f4196de40 SHA-256: 833ea48217dc48d89b8271858ce012ee635b0cf8276a61695cf3d507b695a691
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script is likely responsible for redirecting the user to external URLs, as indicated by the PDF_URI heuristic and the numerous embedded URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=how+to+get+eevee+evolve+into+sylveon PDF link annotation
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/logopokakejatutibij.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/49897639936.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/fodisebamoz.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/82924970859.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/mifuzawajukumoboletor.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/wizanafipurarixipuzuz.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/17979331947.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/81708621982.pdfIn PDF document text
    • http://mosjob.ru/images/file/40631562779.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161390ebec31b6---wafefebujunix.pdfIn PDF document text
    • https://olterus.net/contents/files/87070176676.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/56509445767.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/guzolixobuxisasem.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/zamobugifazavakexumobiri.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/fagerukororizaseviwozivu.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/58313032245.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/27866570145.pdfIn PDF document text
    • https://superpart.com/files/71970405012.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210924075455.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/52209611454.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/dupozonoguwosonos.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/gobona.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/42161277276.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_off0000d842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD842 18420 bytes
SHA-256: 96957fc0e75be15366b1698cf1f65352bd02ea46e2dafd1a3ce5660be0944690
font_01_sfnt_off00010849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10849 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12060 10280 bytes
SHA-256: 7a8542952792478cbed46cd8de9169737e3a08bc8282ac1d3d9f770f94633eae

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