Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8bee04564983b2b…

MALICIOUS

PDF

78.6 KB Created: 2021-09-20 05:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2e7daac4d7ed7b41a9e1db8781c19c2f SHA-1: c50e2f856b297b7491ef204acd0880c5febb3268 SHA-256: e8bee04564983b2bdd1879dd6e7417353ee26b48612973d111ac893ac2e99726
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 phishing or trojan threat. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. Although no scripts were extracted, the presence of multiple unknown URLs suggests the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://yuc-fac.com/uploadfiles/20210906094607.pdf In PDF document text
    • https://lochoanggia.com/upload/files/40660693726.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/31529720424.pdfIn PDF document text
    • http://altus.pl/userfiles/file/27224636097.pdfIn PDF document text
    • http://riviera.az/userfiles/file/67886696707.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/gidokewitopozaje.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/3041222677.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45841980051.pdfIn PDF document text
    • http://offerparts.com/upload/files/suborabelamuzaxalib.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/wubekol.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/xixamuzap.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/dokifuduf.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/7015151278.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/72989699615.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8ccc12bb1---28724855507.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/89577550837.pdfIn PDF document text
    • https://poker-fire.de/file/zovunitibisodimup.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/10918283373.pdfIn PDF document text
    • http://umhouses.com/uploads/files/jigulukizoned.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/pujufefuxezetamabidozukam.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b15b52190d---zesunukokobitojuwap.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/zezefadegaseduwaf.pdfIn PDF document text
    • https://chineseclothingonline.com/File/64987456936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=critical+ops+radar+hackPDF 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_off0000cf96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF96 17372 bytes
SHA-256: 688c7c94678fbd5242135f20042983bdd55e83fd4556c53c3ef75c66ad0782dc
font_01_sfnt_off0000fc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11489 10496 bytes
SHA-256: 3a1c016cd5ef533e97912d9669902a221851ddea72ef763647ffe54735ae74c6

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