Malicious PDF — malware analysis report

Static analysis result for SHA-256 289c6a96ac2fa5a7…

MALICIOUS

PDF

76.8 KB Created: 2021-09-19 04:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 96f4af5328d60ee4b1edc386140db6a7 SHA-1: d2c0d17dbe9b9e151c511db6e6e30c79616f6af7 SHA-256: 289c6a96ac2fa5a7cd681a95f5dd93c48be09feb766bdd08d9be919c2f7446b0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support this assessment. The embedded JavaScript likely facilitates the redirection to malicious sites, as suggested by the numerous external URIs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://krisoc.ru/uplcv?utm_term=baixar+street+fighter+4+para+android+gratis PDF link annotation
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/45940669208.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/93357096159.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/61127959205.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/zufolajafeza.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/jowedanagufisiredatakozof.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/40384435975.pdfIn PDF document text
    • https://uangraja.com/contents/files/geponujoluzavugeluzadana.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/webopuxuperamurowak.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/gadijexilake.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/liguxuxofufomenatos.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/55383777239.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/59987204631.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/47790404908.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/zufivetewosadezezixori.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613971f54aeb4---zazutew.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/82856387074.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/0ffs1c26s9mbfftmrfhao08klj/lawujifipiberutiwe.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/74dj353jephamm5v74q7ac5ddk/85984118929.pdfIn PDF document text
    • http://olympusflights.com/files/files/fojimenuredoseter.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/74893513867.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/62901903021.pdfIn PDF document text
    • http://starma.pl/files/file/rikuzumabakumufabesazola.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/tesefenazuxuwa.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/23714063807.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/29056279745.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_off0000c8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BF 16792 bytes
SHA-256: 8957a8fb1d37db792d0965ced3107bccc5b89e9cbc839b2943020248b469799d
font_01_sfnt_off0000f43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43E 10964 bytes
SHA-256: 241d21b716abc1d08c269e7ce6872f61b5f3fcce3ca19f71b17986e888d9c25c
font_02_sfnt_off00010d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1