Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a4fb93f94e62f8…

MALICIOUS

PDF

83.7 KB Created: 2021-09-24 18:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b02f17fbc7c0e4d995d3eec3d0fde1fd SHA-1: 61180fcb9b129fcdfb77f8a1e1ac8701c57802ed SHA-256: f5a4fb93f94e62f8139676e13462c696e08824d7f712f8c7a854e37979b2ccb6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with a link farm used to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://nomylo.ru/uplcv?utm_term=axe+id+unturned PDF link annotation
    • http://kppzp.pl/userfiles/file/44911356706.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/jumijoduwejorixoxawog.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/57091418172.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/25701751107.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/saveboxekedotagasupezuzi.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/gokaf.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/zudul.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/96336209748.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/zerolugojilexowibunagoda.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/49835963304.pdfIn PDF document text
    • http://elitvorota.ru/f/file/wudifilumasa.pdfIn PDF document text
    • http://ort168.com/upload/ckeditor/files/xusiruxekedasawofapiweto.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363dc44864e---girubigosupobenegoxitesu.pdfIn PDF document text
    • http://saimiri.name/upload/file/91050544151.pdfIn PDF document text
    • https://cowik.pl/upload/10659893569.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/joreriliguzujagin.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/desopiwofejerejuxu.pdfIn PDF document text
    • http://websitesample.in/atlantis/assets/ckfinder/userfiles/files/34428452647.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/36926740995.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/36861032793.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/gulabiwekotemodesa.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/c5cea1cecefc32003df48b9db51665cf/9590902658.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/pijakag.pdfIn PDF document text
    • https://maria-galland.ru/files/file/pinemerejetepitev.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC416 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC27 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_02_sfnt_off0000f1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 21760 bytes
SHA-256: 9434b23696c13b5720154e9a93a424e1aede9cd961e64f49a87c9957b53ff4b2
font_03_sfnt_off00012ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE4 9928 bytes
SHA-256: a964eba1a107061158b57fd7f6d8aadce67831b8b6bb68feb8f4cb1cface1230