Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea43dfe1af23fae…

MALICIOUS

PDF

78.0 KB Created: 2021-09-13 07:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a3e1a1c0700136ff1b50162b11f3941a SHA-1: eab05044925feb5007656b19c0bcb4022d28cab1 SHA-256: dea43dfe1af23fae2ecaf95865f0b47ef5f9bd797e1cdbaa152ba1fa3d570402
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one specifically identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. Although no scripts were directly extracted, the nature of the embedded URLs and the heuristic firings indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/lasutoxe.pdf In PDF document text
    • http://metall-press.ru/files/36368747082.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/sotekupowiduvutejofesel.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/15292761229.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/tewonapuwenumekagiw.pdfIn PDF document text
    • http://isvpro.com/custom/files/depazokukot.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/relusivixabi.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/puruv.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/roraligixuzazowu.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/livejinisofiragasopilexib.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/26157578108.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/72247172263.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/dezekulete.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/79522803415.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f18586df90---20772517050.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/35454430959.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/9357891879.pdfIn PDF document text
    • http://origo.ws/userfiles/file/24399907157.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/satotekemupipep.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/sumosuxor.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/wutikijesikupusawemajuwed.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/cd37rik2k04jn0r1h072fhlidv/21205327925.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/10341566717.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/65237981824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=extreme+car+racing+mod+apkPDF 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_off0000cf6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6B 16508 bytes
SHA-256: 5df434894c3d591a82d7e5802b97dc1700de31e85153d167332685d7993fbd6b
font_01_sfnt_off0000f9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FE 10820 bytes
SHA-256: 160bcd9288fe439566d165ed608f6f7333554e90326a3c71b454ae1329c54f6d
font_02_sfnt_off000112bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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