Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceb5f464c731fdc5…

MALICIOUS

PDF

72.6 KB Created: 2021-09-20 11:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8c8f7c60971655e5900d77e4eb72198e SHA-1: ab8900787f70dcd2d0fdc0b367380c02673ec811 SHA-256: ceb5f464c731fdc552d772dd9788aa6706c08089bf0d599059e49310f231d7a6
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. The presence of embedded URLs and the 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggest the document is designed to trick users into downloading a password-protected archive, likely containing a secondary payload. The document body is heavily obfuscated and unreadable, but the heuristics strongly point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ketchas.ru/uplcv?utm_term=how+to+backup+and+restore+viber+messages+on+android PDF link annotation
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d86493cae4---medotidadusu.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/jusexiwul.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/21136476724.pdfIn PDF document text
    • https://ancoraeducacion.com/images/tojitumipeji.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/lolalimopomuxeposota.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/39676653996.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/fopeposukeped.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/55905690756.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/dedorutotisafojale.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/juwerenex.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/xitotusefebipok.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/64122827454.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/rireruxazimefad.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/bomuworuwowobu.pdfIn PDF document text
    • http://wawa757.com/uploads/files/pitetulepolufevasezev.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/63230319060.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/59336347773.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109102336507496.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/73634980215.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/ledojitaxiladoromejowed.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/kutobe.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/54985768966.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/kivutasetizipavu.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/lujugosinusekikomazoxa.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_off0000b88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88C 16060 bytes
SHA-256: d889dd4867629556ee8db5508a2b86db071c4f666e10e335c5c1304f0d8413b4
font_01_sfnt_off0000e1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A5 11284 bytes
SHA-256: ab8030c78da7b660521fadd158a9d8889615f1abdff0a13b4b60a49765ceef90
font_02_sfnt_off0000fbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1