Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb0db6f8b099d4d…

MALICIOUS

PDF

70.8 KB Created: 2021-09-30 18:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b5ad890c5c2aff57fd325685da924904 SHA-1: 3595b2a9d0ada0a7f72c864ced30fec3f02845a2 SHA-256: 3cb0db6f8b099d4d841121b5ed35ed5df2d4720132a4020b6eeec270b634a059
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://sasalidayanisma.org/uploads/file/94411512524.pdf In PDF document text
    • http://robalton.es/Albums/images/file///purazolanejeme.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/fonawav.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/9473792207.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/temibimuporeloz.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/pipuxotup.pdfIn PDF document text
    • http://blgjad.com/upload/files/81204903673.pdfIn PDF document text
    • http://koala-al.com/d/files/8830249352.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/27288811441.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/42802726007.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/7459080407.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/96461607189.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/59866612872.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135dca61de3f---9343289500.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/2354638985.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/tapanojux.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/dunovudasiw.pdfIn PDF document text
    • http://domexpo.ru/up/file/14814379369.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16143602999c9f---muzokexizevegav.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210930_5B9C81ADEF746511.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090214022348.pdfIn PDF document text
    • http://showdoimovel.com/files/files/domapulagijexin.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/gogufamotadajesoguje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=rival+rebels+mod+minecraft+pePDF 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_off0000b0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E8 11032 bytes
SHA-256: edd6a8d9dac8138f5454aac60e1be8fffa820cd438d0151c0d354bc2d3879097
font_01_sfnt_off0000ca59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA59 17408 bytes
SHA-256: a49585e0a741ce12cd035c915cced171c7c4012e150ab4054455bbe3da561315
font_02_sfnt_off0000f587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF587 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1