Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4228fa4ed1a7354…

MALICIOUS

PDF

70.2 KB Created: 2021-10-02 11:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5d44a0edbbaf2bad70a93ee228016d1c SHA-1: fc29e5757323cf3ebe6dbabc237d18c3f21a7786 SHA-256: c4228fa4ed1a7354d86f056850b9fc88030c3c62c4f012c4404050e4294fb31c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 http://garage-ys.info/js/upload/files/mozarutaw.pdf In PDF document text
    • http://club-integra.ru/userfiles/file/welibaminuvomavotowom.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/dumunawalofevis.pdfIn PDF document text
    • http://mocphatreal.com/assets/images/ckfinder/files/37415757631.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/77479631855.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/6227176539.pdfIn PDF document text
    • http://palami.by/images/file/zidebutene.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/31984861988.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/tanazatu.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/jerositajubesi.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/90708972955.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/17175278506.pdfIn PDF document text
    • https://phunhai.net/upload/files/nopizabelalijovi.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/fulenujidoleto.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/retexarurexu.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/17978501726.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/19731451496.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/20099206856.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210923_DD6B31A9E0FDE878.pdfIn PDF document text
    • http://kammed.com/userfiles/file/85702048647.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/23337455164.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/36196509457.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/161559e68a19ed---segoporezizamafegis.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/52372022687.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bvu/20210915/file/82784760761.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f579aa3d6a---9493478185.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/mopomovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=type+of+consentPDF 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_off0000b608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB608 14932 bytes
SHA-256: aac251a35b58a2b7c65de7de08a6ffe5a577cb69323565062beba8c2c1d4e830
font_01_sfnt_off0000dc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF420 10152 bytes
SHA-256: a5f6b69b256390b9d966a34961dd5b78f5705cd76a642a775e4d628ac0300124