Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb01df9036b3314…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 21:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c30466ebfb4f6840f3696a166ec20fcb SHA-1: 663872a26976374aa88fe5094304c37f3eb78eac SHA-256: 5eb01df9036b3314085e3cc6b3d71e512b7d438f4feb2123f0f4db75e0dabc67
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external resources, suggesting it functions as a redirector or downloader. The PDF structure and the presence of external links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ketchas.ru/uplcv?utm_term=words+that+start+with+g+and+end+in+n PDF link annotation
    • http://files.ibiza-ferien.de/file/zotezibibu.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/36661441633.pdfIn PDF document text
    • http://sns.hu/_user/file/jemos.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/gukavaviwimo.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/60235091651.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/64796217422.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/93157532654.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/84884227176.pdfIn PDF document text
    • http://calisnt.com/uploads/files/bovoxirawedobuvedodol.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/wazotopujidojuzumunupe.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/vexakajifagegapuganegusog.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/kurigod.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/92427558437.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/90072448501.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/makibawi.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/40125372806.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/jemejawizexi.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/palctrqji084pikb9aun2r1r19/wifazigolobedud.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/rijafemab.pdfIn PDF document text
    • https://eventaipei.com/upload/files/jidifitete.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/64245619515.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/bodazadotetag.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_off0000d738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 10560 bytes
SHA-256: 6bcee78b47ea30cd60650ad0b7b449992b21cca0c47757cc8a5ae371ddb063a6
font_02_sfnt_off00010732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10732 17416 bytes
SHA-256: cddab480b9413f669e099f0068f4478e9f58df098b70d46f0551d1e60331cb83

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