Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c2dd5a4dda6f715…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 10:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5d034904c2fb96592141c4ffa95210cb SHA-1: f6711599ddd049c45c68b7ca132f4f0e187b3089 SHA-256: 3c2dd5a4dda6f715877d8a06c41c681d3a8b77cec36fc445348b37af5bb25d4d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chachachat.info/js/ckfinder/userfiles/files/pemejejunutab.pdf In PDF document text
    • http://doubles301.jp/files/ckeditor/files/mapedol.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/ledivir.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/sirusudusibebevawipi.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/rijapiwezanepetuja.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/tukatajewazize.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/75201319921.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/3644305543.pdfIn PDF document text
    • http://ranfeng.com/userfiles/file/2021-9///2021971645218175.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/mimunevowuz.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/64168461282.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/87960585404.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210905_0733638AC78B9029.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/bipavaboxaxom.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/tusevowexebevekazero.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/rabux.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/99936747093.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446190a4da2---84493900227.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/lekotufifiduburasowilesu.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/mipakasupunoronubofezi.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/36675678289.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/wegaworigawekobulozo.pdfIn PDF document text
    • http://redactron.com/userfiles/file/99692865536.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/zumigebuf.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/04/file/lakutosow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=max+payne+mobile+apk+obbPDF 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_off0000df12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF12 18300 bytes
SHA-256: 25f5fbbe4617d49ee290ec970b1de7042ea3b6b4639e2e368aeeb9fe863430fc
font_01_sfnt_off00010ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E9 10488 bytes
SHA-256: 0cbcc9b29893d12baacb175ec6a1fa7bb26b97b88926898d9f4e73cdeef8fd32