Malicious PDF — malware analysis report

Static analysis result for SHA-256 c582cd58a4dbe774…

MALICIOUS

PDF

79.7 KB Created: 2021-09-18 05:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c001b96254a6663d1ba49a5fc83e0ff9 SHA-1: 96ae0763483843c27a9d9bfa84eecfd6ad42eb93 SHA-256: c582cd58a4dbe77489ec9d1cdd0e258dea807b0bff2afb27c383d1c9df89ee9b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to suspicious domains and structured as link farms, suggests an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://goodwill.pl/userfiles/file/zexezomokuxe.pdf In PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/ziwimewowenudotojokesu.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/96610223995.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091301171873499.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/mosebosazudekaxe.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-04-15-32-36-33.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134c37e34336---mofago.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/92959560532.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/3412386480.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/94350985830.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/57147503161.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/98593522528.pdfIn PDF document text
    • http://gestioniarmatoriali.it/puseg.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/49967189261.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142ff09509b9---18237226112.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/goletilamomukujedet.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/6562099080.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/33615534687.pdfIn PDF document text
    • http://laduses.nl/image/file/82946538764.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/71717015845.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/25582487599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+save+a+webpage+on+androidPDF 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_off0000d348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD348 10804 bytes
SHA-256: 93c61d5ff7f536d345b65ac4b8d58913303a04cad0a3d5a88d6237fd4914dcb8
font_01_sfnt_off0000ebe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE5 17744 bytes
SHA-256: de8af2802e53f68da871cc6b23a9340a482be94a0281ba1c0f9b45ce2b2331d3
font_02_sfnt_off000119a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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