Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d90dccf637180f…

MALICIOUS

PDF

84.8 KB Created: 2021-09-14 06:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e90cd0bcdc81c0186528af3c83fe2e74 SHA-1: 0e5d4fbfd51df9824a300756ce93f2806312ebac SHA-256: 50d90dccf637180f1b6c8a5fd7800ab4910c037118b829d3129f0495afd4af8b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to the document acting as a link farm on potentially untrusted hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://drafthe.ru/uplcv?utm_term=ullu+pro+apk+mod+unlocked PDF link annotation
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/90423724923.pdfIn PDF document text
    • http://wirheiraten.de/images/file/nivopoba.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/dc137ab8eee2b7e6b9ce1fcffb38e098/83306969701.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/zutaxarejekafetilufotagix.pdfIn PDF document text
    • http://trieuduong.com/images/Download/pamawukogodovogujuget.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/nepulurafamod.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/44352855124.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3fa721d17---zozubaw.pdfIn PDF document text
    • https://specializzati.tecnaevolution.it/dataload/ckupload/96979772783.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/fuminujuvenil.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/vogevazetew.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/44546362796.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/11288738636.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/5935332726.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/tejodivezunowe.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/17878546427.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/97426805945.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/19039958062.pdfIn PDF document text
    • http://videlec.be/ressource/file/lozezo.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/gerajofidebakomeno.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/ropebekuwup.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/57161859025.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_off0000e673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE673 10516 bytes
SHA-256: 0cf2a6405fc9c69ad97e815b0bb544ad910bc46f039ff43b11325068e3adc4d1
font_01_sfnt_off0000fe51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11663 18216 bytes
SHA-256: 4a6a2af6e4ca1fe518a88d388b9f9ee37344ce8a4371c9cddf44e5b5fd2e3db3