Malicious PDF — malware analysis report

Static analysis result for SHA-256 9121bc57c13f6c76…

MALICIOUS

PDF

105.8 KB Created: 2021-09-20 09:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 84a705dbcce5b53492da698fe325c802 SHA-1: a1d4e3d2384b023ac947f30c711dc535744ab4f6 SHA-256: 9121bc57c13f6c76f536c53599d37753c8b7c88a7a7c6a710037ac994024e099
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use as a delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://cructi.ru/uplcv?utm_term=mx+player+hdr10 PDF link annotation
    • http://fanta-life.com/userfiles/file/tibepefiwunuzenulovimi.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/86565020174.pdfIn PDF document text
    • http://posuni.com/userfiles/file/87005348563.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/gutavatuwomitozale.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/ropawisidakaribazu.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/xiregipejovujul.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16136d51d549ea---68174390669.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/34291122227.pdfIn PDF document text
    • https://irrisyst.eu/files/file/vovibab.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1631070601_1.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/39187121586.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/75776003704.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87077572724.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/gufixojeke.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090209131073499.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/pasuwurodepitawatujuj.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/dizaxidefabezo.pdfIn PDF document text
    • https://biocoils.com/img/file/viditaforurabobuwomarizon.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/jeviduxaxe.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/xiwutogelejadax.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/wibakotajesaxuzeti.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/13942498245.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/filajifuvigotolivukol.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/54455407904.pdfIn PDF document text
    • 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_off00013a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A72 10292 bytes
SHA-256: 7943eda7f577fb2828f8e45744a5d0708444efb555f13774563b18406fd6d35a
font_01_sfnt_off000151cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151CB 18180 bytes
SHA-256: 413ff2c00e5735a0777473470dd00869d2623e22de603f4d1c004a96428f5596
font_02_sfnt_off00018140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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