Malicious PDF — malware analysis report

Static analysis result for SHA-256 5542d64f38cef271…

MALICIOUS

PDF

78.6 KB Created: 2021-09-17 02:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fdba350c3333df3ab4312623aa3a2bff SHA-1: 12bd2d40ef09a237b39b4a2d44e23011028922fe SHA-256: 5542d64f38cef271f27e4e014d8d4a34f391b87f534bc3c8f4de280acf49e72e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a high-risk heuristic identifying it as a link farm on disposable hosting. The authoring application 'wkhtmltopdf' suggests it was generated programmatically, likely to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=download+amazon+movies+on+android PDF link annotation
    • http://ozdesignhouse.com/app/webroot/uploads/files/kusudamukod.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/39282723679.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/biwigijebemipu.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613084e40dfeb---kelonujurimenuw.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/navuf.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/dabifepekevupuzolujun.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/79329990135.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/juzuwawovur.pdfIn PDF document text
    • https://agrando.cz/files/file/9044455137.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/toratexivomeviravisewa.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/fedekopekubiwamedujasixo.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/buruberevokopazakavub.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/73241684621.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/lokokufuwenol.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/11049965607.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/fozuzimejos.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/lenevixixufiriribum.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/v63lc2krjtnb6fr5k5io8rfht4/47503657332.pdfIn PDF document text
    • http://artediapharma.com/upload/files/67465477206.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/6644952810.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/durobuwalerabaweta.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_off0000d1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A1 10524 bytes
SHA-256: 6ff91238b5ed4659c776f6a610cff0ee507bd74fff975511ae9e01aa4ca79b70
font_01_sfnt_off0000e996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE996 17128 bytes
SHA-256: 93d9f42cebf3d3daa6dd664717cb149673bd4a6dc9fb674bf61fa6770ea4a732
font_02_sfnt_off00011557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11557 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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