Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8b784c92ec2494…

MALICIOUS

PDF

129.7 KB Created: 2021-09-08 18:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 06c48b29df994154a85144e8c51d608e SHA-1: 03c32ffd84fb7f51f11557ed430968b09ca020ce SHA-256: 5c8b784c92ec2494ed0f14e676d33d2f658d05f3896b7b492b569c11dad70468
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://alwillislifecenter.org/ckfinder/userfiles/files/darux.pdf In PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/dufuxajituxisutiwadowadaz.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/58712040676.pdfIn PDF document text
    • http://dsraxys.com/uploads/66037345285.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/keburuforonigomitupejave.pdfIn PDF document text
    • http://exima.kr/userData/board/file/65709161350.pdfIn PDF document text
    • http://maidichike.com/upload/files/21615478822.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/89881252786.pdfIn PDF document text
    • https://tmtteks.com/files/14569136343.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109011558528366.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109020715326603.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/40098069223.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/72470191912.pdfIn PDF document text
    • https://zzhqhi.com/d/files/wuxusesagonimajuve.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/pibitudidudosokitenesodib.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/80600340658.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/38118741147.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/viduviwi.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/4a84695f44025a008966f32844e942b6/24189658670.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/galawewozapa.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/440cc670e607229321f9903630dfe9e7/43527912949.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/7719178828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=polar+h10+heart+rate+sensor+user+manualPDF 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_off00019377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19377 10556 bytes
SHA-256: dc0f6ce699a6553a6c73b0c394a03275b76a589c11e986985f31cc85258f6caa
font_01_sfnt_off0001ab71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C383 20076 bytes
SHA-256: 0d3bc2396fa6e30b5b93c4211c412f5309d5b17f7296c9fa65a77f50c0a5a7c6

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