Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7574b6ce2399517…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 10:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7010461a4395e974a33de53ee43030b3 SHA-1: 1af2258df48220138888903a5228566f229050bf SHA-256: b7574b6ce2399517c5feb046041c603b48b2d03f2143303dbb97ea268f40e1dc
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristic analysis revealed it functions as a link farm, directing users to multiple external PDF files hosted on various domains, likely to obscure the ultimate malicious destination. Although no scripts were directly extracted, the PDF structure and the nature of the URLs suggest an attempt to deliver a secondary payload or lead users to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • 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://baaningdoi.com/file_media/file_image/file/kavoretatuvikepetezobebis.pdf In PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/3184939120.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/gedevomoxufug.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/83439519658.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/38899970392.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8dce5eefd---mamuzajamepizep.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/sizegemiremubamago.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/6652197530.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/papegidadexezasa.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/27426000687.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/ranajunudedepigok.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/dukapox.pdfIn PDF document text
    • http://fitviewer.biz/files/file/vezarasebivuwuwin.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210907_105233.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/77325955221.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16142e1d672c49---41502598022.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/48178688552.pdfIn PDF document text
    • https://eniedu.com/data/file/20210914020402.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/poximutejavewebonepelam.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/074bf47b97ba60a8946c687d5e5c83bb/lutidanof.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/mapozovufuwemo.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/39871754164.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/zaxegow.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/85651220044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=euro+truck+simulator+2+mod+apk+obb+download+for+androidPDF 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_off0000d446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD446 16992 bytes
SHA-256: cddb38a062826a9ddbf54be636ec9b68f8aefd2dd6312ce7acab2404f4e5e2ad
font_01_sfnt_off00010009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10009 11168 bytes
SHA-256: 5ef62fe9f90e0005d1b97e0d3a03926762472e74031182e3bbc55cbb7e7da728
font_02_sfnt_off00011a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1