Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a6096284d1025d…

MALICIOUS

PDF

77.2 KB Created: 2021-09-08 21:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ebf50eb4cfeae452543e2169d70eefdb SHA-1: b8815daf6c6494c7f492dd9513f51fd9de21623f SHA-256: b6a6096284d1025da3df155767a27e99da83a1c400591b09fa4c5ad589ee4b1b
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous extracted URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://focalthai.com/file_media/file_image/file/wuwavizebobi.pdf In PDF document text
    • http://handsonmontessoripk.com/userfiles/files/30254712759.pdfIn PDF document text
    • http://grafitym.kz/files/file/74953201751.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16133ec73c079a---pibavo.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/jirujuzafafive.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/83394735139.pdfIn PDF document text
    • http://vititanon.com/user_img/files/bolufukewasaxonimo.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/89077464998.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/kidekukefuruwikomegijode.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/8926953397.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/83532782657.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/88714468773.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/56033533461.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/34308507769.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/paxidazixeluxexixuwo.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/44765750919.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/matuzowiriw.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/45579808003.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/lotofu.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/19625931019.pdfIn PDF document text
    • http://boki.hu/editor_up/kexupuluwesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ford+taurus+x+2008+manualPDF 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_off0000c7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CE 10812 bytes
SHA-256: fdf9ac1fb94faa75d5c99741e2e30504c409664284a0a8dc8f38fd212863a441
font_01_sfnt_off0000e0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CB 18140 bytes
SHA-256: 184e78b189cebfe6a73078e3103a2cbbfe7d549a17e80c8334317656a634f8f9
font_02_sfnt_off00010f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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