Malicious PDF — malware analysis report

Static analysis result for SHA-256 e72f976f97032561…

MALICIOUS

PDF

87.0 KB Created: 2021-04-11 18:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: caa08d522357a5c5675359c1d3ae69dd SHA-1: 51c223078cccc461977fe378a9eedf6525aba084 SHA-256: e72f976f970325614a5881eb262d63959c4cacfd5dfb45438c25be54cd2e4fe6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead the user to a site like https://vilenefex.ru/strik?utm_term=universal+audio+apollo+twin+x+quad+price. No scripts were extracted, but the PDF structure itself is indicative of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://vilenefex.ru/strik?utm_term=universal+audio+apollo+twin+x+quad+price PDF link annotation
    • https://cdn.sqhk.co/kuzaxepigi/hiZshad/71821440326.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390095/normal_6038f34a8ab62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388165/normal_5feba377a966c.pdfIn PDF document text
    • https://cdn.sqhk.co/mogezunir/gOgcla5/globe_at_home_prepaid_wifi_speed_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481163/normal_5fee63ac9a8e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463809/normal_600b380386208.pdfIn PDF document text
    • https://cdn.sqhk.co/fawabanof/B7ib5iC/software_testing_manual_and_automation_interview_questions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369332/normal_6038ed5f89eb3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401517/normal_5fca3cb7d7d0b.pdfIn PDF document text
    • https://cdn.sqhk.co/putuziboki/BdPeijU/video_downloader_uc_browser_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445320/normal_6031ae51ae925.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387427/normal_6035025d89148.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368474/normal_6011073509b61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419623/normal_5fe143af17838.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/fhgihih/weritomenafaxejewuxijamun.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/D1Rjahi/gangstar_rio_city_of_saints_apk_for_iphone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_d1566ab48f824a009abf45e310d0663e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/jopam.pdfIn PDF document text
    • https://cff07a16-13b2-455b-8a78-148a75b158b4.filesusr.com/ugd/cda0c7_a040495db885427b8c3e35b249cc46d1.pdf?index=trueIn PDF document text
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_e1eeca0ea9a842a38d7adb89b403d75d.pdf?index=trueIn PDF document text
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_abb52b79476c41b6bcf24998e4f9f7e3.pdf?index=trueIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_bf396067c2964026b75b34c71d7b97f5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/fefen.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/android_studio_soft98.pdfIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/divorce_template_missouri.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://scripts.sil.org/OFLIn 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_off0000fbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE5 5404 bytes
SHA-256: 399ef070459d8a5ac00c4b2f60ea2e4d82a0b8fa8febb7893aef722dace7506b
font_01_sfnt_off00010e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6E 12112 bytes
SHA-256: 04bb525d582ec0ea5b93e21a1d5285605786596dd503cb5379b7a8b0cb37e37e
font_02_sfnt_off00013742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13742 16448 bytes
SHA-256: f72c050da1b9d2b252b60d923d48b873e3167586161433f4ccd489531a5eaa86

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