Malicious PDF — malware analysis report

Static analysis result for SHA-256 426bb404566fd75d…

MALICIOUS

PDF

72.7 KB Created: 2021-09-10 11:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0458c261afb6f1e1cd3a2d8d6af25575 SHA-1: eb4b1be94d7de856f4c17b591ba60b649becbad8 SHA-256: 426bb404566fd75d960dd20aa84d092e5ee06f99490ee4043e61a5e5451e87fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ags-sib.ru/ckfinder/userfiles/files/73917810503.pdf In PDF document text
    • http://magogaralbamoble.com/galeria/files/feramumavunitobirukuni.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/tebezisudowufanezuvozasid.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/65271965015.pdfIn PDF document text
    • https://stormester.no/files/file/jiwitusajiwuxulifesiwuf.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/zamajasisukumitutid.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/fikubapofawar.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dozuj.pdfIn PDF document text
    • http://metall-press.ru/files/vozumigegiraxifexus.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/tukar.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a817d30e2f---xibewepitudalavaxosasera.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16138ad0a06eb7---dajasosabibezojutuwoweko.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613244b551f3f---serakokev.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/sijadisumixogof.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/tunatidirapekef.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/nozapuzozirofofelisafita.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/bipurisiratosesila.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/zamagelufaretuxaselevab.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/48355719070.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/balozawawizevudikerud.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/64635839233.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/35383590359.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/64747839422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=smartphone+data+collectionPDF 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_off0000beae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAE 15284 bytes
SHA-256: 94be3428395015b0dc498e3c6f7134f78f1aabf29020e4066ac0943deddecf28
font_01_sfnt_off0000e50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD22 10688 bytes
SHA-256: 5234de5e63e659278adb4c5b720a2ab4cb63a5a5d3d21083fe4b3fd5bff88b22

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