Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8bdc5b094e3d3d…

MALICIOUS

PDF

86.0 KB Created: 2021-09-17 17:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fdf8583e3c3f05663329c82718647c6f SHA-1: 82c3b40e44612faf6d14f709014152116f234e7a SHA-256: bb8bdc5b094e3d3de1d1c3bbc6102fb0d42cd8a74aa7b73f676ac584263e8214
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The presence of numerous external links, many pointing to PDF files on disposable domains, indicates a link farm or phishing attempt designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 https://locktactyuma.com/ckfinder/userfiles/files/18195092220.pdf In PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/58712477964.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/4649984709.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///65126297097.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/85286536849.pdfIn PDF document text
    • http://dgone.kr/userfiles/file/20210916165855.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/13805311383.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/zudotutiwonu.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/pezazorafaf.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/xutamexekipupugul.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109012328584481.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/jixusisezegijo.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/gisozu.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/17820419294.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1631311267.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/zikonuk.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109090936111003.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/62542294404.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/kegerosebelukapoku.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/38312202802.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/66252421140.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614356b8e9a80---valifivotibefosumidevuw.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210911_0CA37330B6764E2D.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109020233225092.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/87720318695.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/24697900906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=game+game+play+storePDF 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_off0000ea21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10233 18328 bytes
SHA-256: fe6419e9694cca1346ec5a794470b420f9f46cdd103f054c35886fed1a6c0f3e
font_02_sfnt_off00013249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13249 10552 bytes
SHA-256: 7dad3a7281bbb6336421dc729af4bbf07a7b7b11799c536e59ca7f00782515c5