Malicious PDF — malware analysis report

Static analysis result for SHA-256 642d35f7bae8f316…

MALICIOUS

PDF

73.5 KB Created: 2021-09-17 16:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 346583e11d8601876315716bb7680a71 SHA-1: 4f6b56070554285ba9537c9c48537e502b84311c SHA-256: 642d35f7bae8f3161f1893574353766af9b563a82b3eb9a54ec1513700dac80c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm configuration. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://allytemp.ru/uplcv?utm_term=compare+and+contrast+the+structure+of+prokaryotic+and+eukaryotic+cells PDF link annotation
    • https://china-glass-mosaic.com/userfiles/files/20210915_163432.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/89102974274.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/17233459582.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/99044309511.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/denubagijuxe.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/refutigitematano.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/fejizafir.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/kigenapefakatanum.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/funuxadoxex.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/94369172086.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/9e4e149ca138c37095b5e24e26f4e9e2/15564903488.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/xejasen.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/8fb551257cb1dec8fc73a56fdac9c59e/71681180695.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/24579494130.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/vexokulogetupolix.pdfIn PDF document text
    • http://jainfarms.com/uploads/nutamowijijiwivatuxoradaw.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/48173530466.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/74317735542.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/misesif.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/jofuwubufunetuxi.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/85186975855.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/doxenaxepuretokanad.pdfIn PDF document text
    • https://mollis.rs/files/55342579504.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_off0000bbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF8 11220 bytes
SHA-256: b173d3f06b6ae9d4fc9c827ad12a7cd8aa250720b53c2607d9f5bd7b6caef302
font_01_sfnt_off0000d614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD614 16108 bytes
SHA-256: e9b456231ee15a351cd27d6af35c5d78d8710e43f08b79870fb2594b7bcf9b93
font_02_sfnt_off0000ff50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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