Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39c2d581e0967c2…

MALICIOUS

PDF

83.8 KB Created: 2021-09-12 21:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f8f306d00454174cedd60cad0e51439c SHA-1: 61b34bfd77654fe49f4fbe9d54db12b87c49182e SHA-256: b39c2d581e0967c2f381f04ecd84a390f6ee7e79316788c51cc1bc9dc7c3fab6
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to phishing or malware distribution sites. The heuristic 'SE_URGENCY_LURE' further supports a phishing attack pattern, aiming to prompt immediate user action.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://medvor.ru/uplcv?utm_term=ink+master+streaming PDF link annotation
    • https://mmeasar.com/mmeasarfiles/file/jutemu.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/65898504971.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/gosugunar.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/45039613076.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/aniposawu.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/ac1dcc1f31a92cfeeece21d5b843e0c8/49107538457.pdfIn PDF document text
    • https://fultoys.com/userfiles/zuwukigi.pdfIn PDF document text
    • https://dhesient.com/media/kabebebepo.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/13202628785.pdfIn PDF document text
    • http://yuha.be/_files/file/vurojikipinosineb.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/94410792324.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/76354057625.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/884051050.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/76903737960.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/pinefojajuvaruniwigaga.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/rafobubuji.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/19487648547.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/b9ee287eb4e9abc58529f2bee8f6c76f/89991091302.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/bekunurowo.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/bofaduxulaxiwopevukugoj.pdfIn PDF document text
    • http://only-svet.ru/upload/files/76890913113.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/36219143458.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/xenikilagabujupilagogi.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/78744162262.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/83607946651.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/tekugajod.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_off0000e1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B7 18588 bytes
SHA-256: 3314bbf03397edd6623ecfcd32f2b94992fb96ade71aa09760ab96ed41743a74
font_01_sfnt_off0001124b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124B 10328 bytes
SHA-256: 6714dfd02b0968fc053407279e2897cdd0f069705b6934fc68a61047419f2de9
font_02_sfnt_off0001298f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1