Malicious PDF — malware analysis report

Static analysis result for SHA-256 627b82d75faafe20…

MALICIOUS

PDF

74.3 KB Created: 2021-09-13 12:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e59f2e0d0691de17152ebc7acb72aea8 SHA-1: 6d05936db548f702a76cd05a14ee2ba0998cb86a SHA-256: 627b82d75faafe20b03fa1f4d7d17fce678690d64c4a6c11c9171f8e5bc33e57
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to other PDF files, suggesting a link farm or redirection mechanism. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a pattern of using disposable hosting for a large number of links, likely for SEO manipulation or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://hoalavender.net/upload/files/12256315910.pdf In PDF document text
    • http://ecohort.com/userfiles/files/52727947295.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/99984829388.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/53232564057.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/dopidawefiwelinafi.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/80514014456.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a9d3e052b---64347739359.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/xivavox.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/vevapefojejojewunalefiz.pdfIn PDF document text
    • https://areicon.com/images/file/zotufowapawigon.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/gonegobilekajinivizo.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/81113819893.pdfIn PDF document text
    • https://kawanmto.org/contents/files/pamobupetidonaxiwogoxujo.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/xorakorenidulilovoxejajo.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/88607963812.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/35360342861.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/xirasagezobal.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/96575031147.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/tubokorijesusujukobuk.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/kosafutepemojujewaxe.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/35981271120.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/jewefi.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/85f2l6fuu6maq4ea20ve5l3iod/6270806102.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/salivitaberutotepisalojid.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/12925504305.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=tennis+clash+hack+2021PDF 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_off0000c054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC054 17004 bytes
SHA-256: d8ae1567ecf9744d024f9bdab9505412619cfe1124d37317c1efe26dd962aa06
font_01_sfnt_off0000ec6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10483 10356 bytes
SHA-256: c96be90a12949c5521196828b2e6374b9f4773fcc6b23e43374a04d10a574c1d