Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aeb4ebd05ea1cd8…

MALICIOUS

PDF

80.5 KB Created: 2021-09-08 15:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 79e7b434e20445154658b856c808caa0 SHA-1: ff925186e85c0a98d86e482df20245e5edaa6833 SHA-256: 0aeb4ebd05ea1cd8ed9119c3da53d5c078a672e35f809e502cf37b3721802bbc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, including a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded JavaScript indicates a potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://apicn.net/upload/files/vixivaxizeg.pdf In PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16137ca421a4f6---vunikapuzeneduxepitewu.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/towifuxodaxewopixeso.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/85933972536.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-8/20210908080155660053.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/18023107822.pdfIn PDF document text
    • http://houselandia.ru/files/dajubatale.pdfIn PDF document text
    • https://ferropula.hr/files/59022607012.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/62176162795.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/gunodutuvufo.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/zupojezirekebivanilige.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/71283809760.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/xaxasokida.pdfIn PDF document text
    • http://full814.com/upload/files/40937496523.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/22973995532.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/dp3i1md89kp7mugvhbdkcib1q4/guradivivevibuxusiwex.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/rugadosiwese.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/1986839327.pdfIn PDF document text
    • http://leguido.net/files/50615038330.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/seperanaf.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/73306840547.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/af315ea43a44e6513add6af2d4c967c9/mimabopixalizuti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=bible+study+lessons+tagalog+for+new+believers+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_off0000d369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD369 18040 bytes
SHA-256: cd5370b6f81838392c64e00b6f38283dd1fca989ee3a0a084d738816f7811dd9
font_01_sfnt_off000101dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DD 11232 bytes
SHA-256: 678df68afb26036db9688987f2d3eee7711866404d5ce7891b8835b6c01aebd0
font_02_sfnt_off00011c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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