Malicious PDF — malware analysis report

Static analysis result for SHA-256 edde2b75a73b0e32…

MALICIOUS

PDF

81.5 KB Created: 2021-09-19 09:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ef71992471d322e066f80a3d7478f961 SHA-1: 56af7059a968e6d909529982c8c4e340d2b9a8ad SHA-256: edde2b75a73b0e32ad002048fe9899f3e157489698a9d7b622133094bd67f923
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm structure. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute malicious code, likely to redirect the user or download additional malware. The numerous external URIs, many hosted on potentially disposable domains, indicate a phishing or credential harvesting attempt, aligning with the Spearphishing Attachment (T1566.001) technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://creativeindustries.ru/uploads/userfiles/file/29298640516.pdf In PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/guwuvijogonemukode.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/gadurisadibulomer.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/1992435631.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/87049518496.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/3950317912.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/6135c2ce21a83.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/fatutukexegipaf.pdfIn PDF document text
    • http://01host.ru/userfiles/files/31445804557.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/poziwuze.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/56714212969.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/63277502527.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/kigevovu.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/71320003977.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/xegonuxekoravamemakar.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/gijubisibure.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613589d6ca83f---59473813387.pdfIn PDF document text
    • https://uudanbury.life/files/file/88934596717.pdfIn PDF document text
    • http://ghefootmassage.com/fckeditor_userfiles/file/24810761206.pdfIn PDF document text
    • http://abwrva.com/uploads/files/venovulijenavovimalubiku.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/86995467006.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/46729390934.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/bipeluvuvapitinipuverute.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/87604594365.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+turn+off+blue+ticks+on+whatsapp+androidPDF 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_off0000d96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96E 11124 bytes
SHA-256: 079a4abaa577824990b6ea2d9c876afa16d6b9fe699d2b7b673857775901a0a9
font_01_sfnt_off0000f31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31F 17504 bytes
SHA-256: 39d9356ea36e4266629897d8709c774503f468f1f12915564893c6886625dd9f
font_02_sfnt_off00011f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1