Malicious PDF — malware analysis report

Static analysis result for SHA-256 291a23763007a69f…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 18:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3be980249de3806c32b861e082a7906d SHA-1: ca1c4489b54d20344cfec89f77d9627b78a105bf SHA-256: 291a23763007a69f4b5cfd1fde9e4af47e6e8b91455f1c760e112640f3f81042
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic firings and the ML classifier strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as suggested by the PDF_URI and EMBEDDED_URL heuristics, which are often used in phishing or malware distribution schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ecilingirler.com/resimler/files/jituxu.pdf In PDF document text
    • http://automsystem.com/UploadFile/file/20210902204343481.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/13191260166.pdfIn PDF document text
    • http://bienbao.net/uploads/files/fexelomuledapifejoj.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/dce259b5795ca17f94820ab349cbb355/83979646764.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/39173531950.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/regemigaxumuvizujaze.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/78437394909.pdfIn PDF document text
    • https://synersys.fr/contenu/file/lenodid.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/63834128792.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/36683516387.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/56120540643.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421646d053a---pizeduwategusogokuwul.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/31349073418.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/zadimapupilugikekobefat.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/76649143721.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/60924490658.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/22465133781.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/19476793892.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/49939344881.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/73332103355.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/35703859580.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/71689359188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=photo+editing+apps+for+laptop+free+downloadPDF 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_off0000b013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB013 16932 bytes
SHA-256: d9ab17a533bbc406ffb999c38d12a02346deddd98959c7634300ab82a566fc31
font_01_sfnt_off0000dae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE6 10864 bytes
SHA-256: 3fb428ed8ab1729e31f6d84c9d7f540b9419d4cf79b4fad2bf5e91d43aa15f61
font_02_sfnt_off0000f3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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