Malicious PDF — malware analysis report

Static analysis result for SHA-256 d38cb00212e9173d…

MALICIOUS

PDF

70.4 KB Created: 2021-09-24 01:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 49f7d9de70b0a27f8ac675bea8fd0f0d SHA-1: a9125f5c25c99ee1af17a5b81b3fb4f82421d16e SHA-256: d38cb00212e9173d6fb56a96b7d3197ac5efebad412846e5fea21abeafcc82cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external sites, many of which are hosted on potentially disposable domains, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/87084240440.pdf In PDF document text
    • https://semot.com/Store/userfiles/file/49688782595.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/zubizuvopixuxadaz.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/topukomufaluzumomugapumuz.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614636798ca85---48301138393.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/gijefaxun.pdfIn PDF document text
    • http://kco.su/userfiles/file/87499976135.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/gabupojizadudivotogew.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/47076712654.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/15725900426.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/8162230638.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/57037351366.pdfIn PDF document text
    • http://kusistoconstruction.com/userfiles/file/suvabimewi.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/fatifetukupinovedogusaki.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/bibuwi.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109240554585694.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/55603678798.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/kutut.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/67809291255.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/luxixuzofurisutivomub.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/1093885077.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/riwufijopakapituwozivij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=atomic+radius+going+down+a+groupPDF 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_off0000b79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB79A 14128 bytes
SHA-256: 1e13eccd265ee52e0536818a08c9e42f4fd636c2d6bf30e7c38bcaa30ebb5752
font_01_sfnt_off0000db2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF341 10844 bytes
SHA-256: 24396f9a003109ca090370487c2d3f97cbdbaea8f79e58ca6210c20f40666d2b

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