Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b79dada2fa63019…

MALICIOUS

PDF

80.2 KB Created: 2021-09-14 11:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 980a281636abe542f8282ef4a2879af4 SHA-1: d3291d273c0a199390d995c40a3e53c6b1e3567d SHA-256: 3b79dada2fa63019ae3680986a16515bf627b46e52889889a56dfcd1a7319310
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm designed to obscure the true destination. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score indicate malicious intent. While no scripts were directly extracted, the structure suggests it's designed to trick users into downloading further malicious content, likely through one of the many unknown URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://eksternest.be/images/file/11115067381.pdf In PDF document text
    • http://xatrbio.com/userfiles/file/zutinire.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/1968892149.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/61600914834.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/tanuj.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/47508837127.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/93042831058.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130222484290---2788583248.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/52819626622.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/tegagerup.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/b7k340i63jjt7d5k98qb6iih82/bejizobisobujefegarosid.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/816394345.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/43717763650.pdfIn PDF document text
    • https://kratky.eu/files/file/daxinitega.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/73625392712.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/040234238006.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/99226491207.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/sonetatag.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/12673978927.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/90329414752.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/jagolitawojopagujepuro.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/vosakujalilababuvo.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/637320862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=me+tera+hero+download+full+moviePDF 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_off0000d4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C2 10696 bytes
SHA-256: 17f01f5272e714a0a8b01f6c867598f043a08592a531e76f6734c4ed018ba183
font_01_sfnt_off0000ed18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED18 17712 bytes
SHA-256: ee9d63a8daef73b86179d3b92d92ab8bb06a8167a6ab78cc33971030b9bfc190
font_02_sfnt_off00011b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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