Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b21b7f399ba3212…

MALICIOUS

PDF

83.5 KB Created: 2021-09-23 10:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6c2348defd4392f4f5bf40b7afe33a65 SHA-1: 7b2f629d440c852fe73d644c7c0e473df044b582 SHA-256: 6b21b7f399ba3212efc667ff8d8547d94c2c9a8fcc614ef0d2c6689a27f90f38
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF with a high ML classifier score and ClamAV detection indicating maliciousness. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior, indicating the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://phuketdriveschool.com/userfiles/file/vimuta.pdf In PDF document text
    • http://agarimo.com/archivos/archivos/24583412980.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/59679334292.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/59527454707.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/pejifanopubi.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/78448156225.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/6100494678.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/zelesupofixupugomobegajod.pdfIn PDF document text
    • http://flirdining.com/uploads/files/xixub.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/84341114018.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/wejivaxejenebinaza.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/25541395963.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/51648269303.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/81430311692.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/97597836020.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/11707900876.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614128c86cd72---jejobutagodukekelozoromi.pdfIn PDF document text
    • http://kyea.org/imageuploads/malinokevomuxute.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/5c8301dadca079ccd9921b179ca86b09/rivinijax.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/20324557146.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/tidelodofifa.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/dimegaxijadikiruzofaxovoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=assassin%27s+creed+2+2d+apkPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/zoradurudolozigar.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_off0000df3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF751 10468 bytes
SHA-256: f137bc2638f5176c3ce4cd4cf72640cb7358ba9b209ac30b806d3632af7d2a88
font_02_sfnt_off00010f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F49 18900 bytes
SHA-256: 95b6fca80284afab3409379683e2bb507a2b9bf48ac488d5b2db7e282cac5ca8

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