Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ab520c9696c603…

MALICIOUS

PDF

77.7 KB Created: 2021-09-13 02:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6003144ddff804c0ea4df5e119b2156e SHA-1: 0a1d5d4e6912ccb45cf9ff287e4672a023d432a8 SHA-256: 93ab520c9696c603e31749dd10ebdea2804a24f5a7cb51ac7dc96a04203cdd8a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware or engaging in phishing. The presence of embedded JavaScript suggests an attempt to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://maezawa-jidousha.com/js/upload/files/taziwijovulubuti.pdf In PDF document text
    • http://marthomaiticherukole.com/userfiles/file/defenufumanoxusexudex.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/84321603931.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/68845658634.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/48850242321.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/14438915187.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/70670844175.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/15352503016.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/62968831170.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/5660723130.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/97262723565.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/kifejolo.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/wedaluvebetozekusipa.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16139ff98d4097---73222348049.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/jojalufunudeze.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/faniketakinegokib.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/22511417877.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/11682599280.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/17779497968.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/161303c78ec021---deworinokumolakufebesodif.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/manidit.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/90829871009.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/reviwewetijuj.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/lifoxowatiwavi.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/64019695650.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/94878996502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=excel+android+apk+crackedPDF 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_off0000c963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC963 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17A 10416 bytes
SHA-256: a700203af60a6b55d07beb5ba4579f6f8b0c1aae1488febe9c482d861a59b900
font_02_sfnt_off0000f918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF918 17820 bytes
SHA-256: 06d324922cdb0369883875f1a146762166d1e3d60baef48e96e464b6ceee38bf