Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb505726b8cfa4e…

MALICIOUS

PDF

75.7 KB Created: 2021-09-22 17:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d3f44e589daffbb4a0503bda77e512be SHA-1: 561d659b25f7c45c6fe579d9f21fbfb1856dbfba SHA-256: ccb505726b8cfa4eb31dcb0f9252eaade4e75b166f1ca7384438b96b54e1f08c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to potentially disposable domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a high likelihood of malicious intent, possibly to redirect users to exploit kits or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inannamsao.com/uploads/files/28597513035.pdf In PDF document text
    • http://esebtekstil.com/resimler/files/mipis.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/julawesereb.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/jomesosuga.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbce5305a9---65289005547.pdfIn PDF document text
    • http://lamay.de/userfiles/file/66161789589.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/77956647808.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613518abd23b7---43685233096.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/xibudawibujupupoporoza.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/fujotijijabimesixi.pdfIn PDF document text
    • http://mamam.by/upload/File/file/39021508699.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/44547770594.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/niliritutada.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/kawegogeboxolebikuro.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/26080728614.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/67168098363.pdfIn PDF document text
    • https://keongracun.org/contents/files/tatibonixetorosuroj.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/vometufe.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/87954646963.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/32328357241.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/97433034376.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/pitaxetuk.pdfIn PDF document text
    • https://signika.pl/Upload/file/wovifig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=apex+legends+mobile+pre+register+androidPDF 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_off0000c34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC34C 10960 bytes
SHA-256: 8e3a8f637db67b5d63ea002e980fa6b83b1e353df3c791ec86d4e9b0c49bf447
font_01_sfnt_off0000dc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45C 17224 bytes
SHA-256: a82911598a9bbe2a1da706cba994bb3d79f042b83b441a1fd49ba5cfcb1bcea2

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