Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1be729ae2217247…

MALICIOUS

PDF

76.5 KB Created: 2021-09-27 09:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f06c1f848c5381b294c33164b85656ec SHA-1: c8202bdd12d8cfc0d5c1b284d20d70f3c64fd2a8 SHA-256: c1be729ae2217247f98472a01c798eb3a14d0c072d60f8520538feb660145691
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan distribution. It contains numerous embedded URLs, many pointing to disposable hosting or potentially malicious domains, suggesting it's designed to redirect users to harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on low-reputation domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://inwebjor.ru/uplcv?utm_term=umrao+jaan+1981+watch+online PDF link annotation
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/ziloka.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/bolibodusaduluxidat.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/31972100298.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/6698678236.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/15444920663.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021092711514146.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/97742105426.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/46279691340.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/8506073370.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/22820649485.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5e2a0490a---tikesizulevofege.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/08/tutepitopepuxiberez.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/xewefotutamawo.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/nipeguwupawelule.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/dawanufevusutakebasudosu.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/xenupubanazaguwulopibezek.pdfIn PDF document text
    • https://davnosti.ru/upload/fojumag.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/72901759680.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/ropawike.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210913130604862017079jyd.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7cb19363b---bajor.pdfIn PDF document text
    • http://ipceurope.be/assets/file/duwuniduvenudepebumaxage.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/13008104271.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/duwutuna.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_off0000c024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC024 19624 bytes
SHA-256: f12a8163b75ccff169b4d179ff0dea11de358cf4c80c2e61e80791617cd9ec7b
font_01_sfnt_off0000f343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5A 10976 bytes
SHA-256: db20149b4f1d5b14412c1cf6c446344b369047e0680d9ef0cff342e4804263fd