Malicious PDF — malware analysis report

Static analysis result for SHA-256 92683f7b1c1b98bc…

MALICIOUS

PDF

97.6 KB Created: 2021-09-13 23:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 635146b273e208cb8e92b35812184300 SHA-1: 801021c855a610ac0df4c404c46f541a08f54abc SHA-256: 92683f7b1c1b98bc870544e99f92f6a467b3b3ff6a23308497aa63b6a7101a88
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm designed to distribute malicious content or lead users to phishing sites. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML/ClamAV detections strongly indicate a malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://harom.ro/files/file/rukatunevumotuluten.pdf In PDF document text
    • http://fxlcd.com/upload/file/nivuwaret.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/32638103189.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/80485725342.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/36360717379.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/durakazepafefuf.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/boboxesa.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/556576e2bd6cbf98187c4341052f1236/pozapiribafumiruluz.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/binumonekomeze.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/jezop.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/jezijuzefiwotaserim.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/luvowanoxarirakidagupif.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/6597150695.pdfIn PDF document text
    • https://777mto.com/contents/files/labosegufujakonofobizixif.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/xujidudidesigu.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/76191261510.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/rupajivowozo.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/mizefuketaxixapod.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/66157541601.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/padakusexananu.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161398678eb1df---kapaguluveminelebe.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/35959271627.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/lovomegowipubojasidekot.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/jilexagekit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=yayati+kadambari+read+online+freePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10550 21980 bytes
SHA-256: e8b6dbf07c62b35ada3d99bbe21e12bc9f546198d93e44a12a0e595901149b8f
font_01_sfnt_off00013dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD5 10676 bytes
SHA-256: 443bae19e31498ff53a8280ad93a8949392637c26c7cb5db3582c41db1577a27
font_02_sfnt_off00015631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15631 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off00015e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1