Malicious PDF — malware analysis report

Static analysis result for SHA-256 475483bfc1adb219…

MALICIOUS

PDF

76.6 KB Created: 2021-09-10 09:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 90dfe002b4046eeb0e9294498b453f5f SHA-1: 8381bf3c7ea3d14ef19a460bf82494da55db2a49 SHA-256: 475483bfc1adb219da345bd0f9a832b7594416df64f6a5ce153839cd227bf950
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to a link farm, as suggested by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, which hosts numerous other PDF files, increasing the likelihood of phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://octvads.site/js/ckfinder/userfiles/files/runepasetigedimebunaba.pdf In PDF document text
    • https://gamaconsultores.cl/upload/file/62896031504.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210901053518.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/wetapapepixu.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/wudiwogoli.pdfIn PDF document text
    • http://maksimetall.ru/files/fupolusurimokabu.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/dipafixu.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/gaginutawegubuwowatiw.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109091234135436.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/renapoxasogaruvaduledip.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/susemeluro.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/68355124376.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/25685885902.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/goforelo.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/didekuzuxafeviw.pdfIn PDF document text
    • http://maidichike.com/upload/files/43219770899.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/47693807206.pdfIn PDF document text
    • https://ka-base.no/images_students/files/kulotisa.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/96699872070.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/mafejotulozosuveso.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/rivupipibupoxugi.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/jitesarofamipuxitapotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=neil+gaiman+terry+pratchett+good+omens+pdfPDF 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_off0000c7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE009 16652 bytes
SHA-256: 22a4d1db4187717accb7c175ed6ec406a0a8dfc569bdb53dfa958d20de88ab9e
font_02_sfnt_off00010b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B05 11160 bytes
SHA-256: 6e9182c3f9b35dbdaefc60d71d63a94b3325760cd95a43cd1f90351b91c9d09c

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