Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ead45619272372a…

MALICIOUS

PDF

72.2 KB Created: 2021-10-03 02:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0255688e4c2a188445c14d699a6a99ce SHA-1: 88bcdd12f9d67f3a94b5d3204fbcfd01c7ace500 SHA-256: 5ead45619272372a0719b8cc6786d371e9410035204ad6941c51b6616c113d34
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers also flagged it as malicious. It contains numerous embedded URLs, many of which point to suspicious PDF files on various domains, suggesting a link farm or redirection mechanism. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a pattern of using disposable hosting for these links, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://www.kowel.com/ckfinder/userfiles/files/1631086350.pdf In PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/7340489008.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/69197845810.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/sedorotosonetezidasiv.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/96759772132.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130306f0be10---xedujojijevanipikusim.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/5304209610.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/belewifut.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/lifejubivurufuxixipubo.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/labisesinajikiruzegonup.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/93752426745.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/da87052be0e18b32b906e0ec63b5da9a/kovepupowemenoku.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/xabusawakulebube.pdfIn PDF document text
    • http://precisao.org/files/files/30609505696.pdfIn PDF document text
    • http://15881588.com/ckupload/files/23473733959.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/tudajugagudozamokiwijilo.pdfIn PDF document text
    • http://headrepublic.pl/images/files/wifasekobodosu.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/50853907357.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/vamidikoninovum.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/movedes.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/81328805318.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/18910784964.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/63136656.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/xodupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=define+gardner%27s+theory+of+multiple+intelligencesPDF 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_off0000b21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB21A 11316 bytes
SHA-256: d618beaf6b94720779f5fe9177f77608be2aae22dd041471bf8604cf5d3873aa
font_01_sfnt_off0000cc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47C 17320 bytes
SHA-256: 237d6007273227b7143fb02b2faa5b7152a690e7eedc2f75d07bbcc465b0f216