Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ba72f23aa26ae7…

MALICIOUS

PDF

82.2 KB Created: 2021-09-22 14:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e8104f8fa0e67f0c84d2e853b9549cfa SHA-1: 1fbf2a68f96b8e830a0a6d65878fc716c499c40f SHA-256: e1ba72f23aa26ae7d7dcf342bfe686953d85cdcc89c8b905df8cf21c6c9bc96b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely a phishing lure to a compromised site. The presence of embedded JavaScript points to its use in exploiting the PDF viewer or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://allytemp.ru/uplcv?utm_term=installing+google+play+store+on+android PDF link annotation
    • http://imhang.com/fckeditor/userfiles/image/varejakugevuto.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/pozelikofi.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/muzej.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/41129838198.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/tilanusune.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///jumumo.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/varapemomuperawisugese.pdfIn PDF document text
    • https://austarpharma.com/upload/files/99801298493.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613246f45b155---43165280142.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/zuvexiledav.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/ganoxutijasusepopelur.pdfIn PDF document text
    • http://sbmhavacilik.com/userfiles/file/fuxefafaguv.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/37768229851.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/84753930056.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/tefofukodepiroxugozagetoz.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/dukovavuta.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/84898953174.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/96091487373.pdfIn PDF document text
    • https://uangraja.com/contents/files/76838932915.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/tadobazizubebepewimonivep.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/gaxunafobiv.pdfIn PDF document text
    • http://cl-pub.com/files/files/44583138081.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/8e9a1cfd98490bef227502e796773d35/podunikivomafivorovosakut.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/rujiriwekowozepizepupede.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/wigazazezezagaguvuvixabo.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/34202804575.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/26169836816.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_off0000de17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62E 10632 bytes
SHA-256: d448cfacad5aeaea625594cf93863076fd805815b7f673e6742eb7a172abbbcc
font_02_sfnt_off00010e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E68 17204 bytes
SHA-256: 0b2e22bbdb03b66e59a56d3d664f57b0ecdf8535a827f6a625c7fdf3746b50eb