Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed808e57e96e91f9…

MALICIOUS

PDF

80.3 KB Created: 2021-09-16 15:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8ca67a0157baf858fa6d75ccb6e18173 SHA-1: 037fa54dcb1287f57c0ce6a7b3028e76ffe78294 SHA-256: ed808e57e96e91f904fd1350ca3f7c0e0c10206cc61dea2686a9d00df8c78d58
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and is described as a link farm. The presence of these indicators suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://karpataljaturizmus.hu/upload/sokozixolo.pdf In PDF document text
    • http://pololanna.com/user_img/files/kijol.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137398a599cb---78492308857.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/kamemegebi.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/83436334705.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/44281606159.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///fuxoniwemonud.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/81566182603.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/38364031089.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/tulorokubutuginofuj.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/dojepeginarujemovotatij.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/12164033729.pdfIn PDF document text
    • https://sledovani.gpshlidac.cz/www/userfiles/files/59033159278.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/7696603469.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/37609987061.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/94256625036.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/55212424613.pdfIn PDF document text
    • http://ping-property.com/user_img/files/95715956582.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/pixevesixitukugizimupaj.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/lorigibijebajinimared.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/76141641283.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/23188354253.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/85890676010.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+change+phone+pattern+lockPDF 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_off0000d75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75E 16988 bytes
SHA-256: 8fa56004133a35e6b1f783c2d8d3004cdd19c6b7d70ff78653510a79c181e177
font_01_sfnt_off00010335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4C 10564 bytes
SHA-256: bb9e9fc0caf77a0c6d1cb319647b28bff6b176b91d327a1896a0b26d82cb2d60

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