Malicious PDF — malware analysis report

Static analysis result for SHA-256 923414e8e20d5791…

MALICIOUS

PDF

68.4 KB Created: 2021-09-30 16:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ef44b7c3e79d890da64f1b6a8f1cbc5a SHA-1: 2abf8fbe0b010dbe6edea1f4696459fcfea5a220 SHA-256: 923414e8e20d57916c6ce6b995c8382f2402d3af0727ba43d46e50e898f21076
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains, and one heuristic specifically identified it as a link farm on disposable hosting. These elements suggest the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 5

  • 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.
  • 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://immobilieninvestors.de/userfiles/file/xotivap.pdf In PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf1c216c8d---mozanujuvaguk.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/vogam.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/18725390.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/16790582445.pdfIn PDF document text
    • http://anninhsieuthi.online/upload/files/puvujofipejisakazosanowuk.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/47752969076.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/riwow.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/notedebexewopopusivopizil.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/gasalopebufisa.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/sitenabaxufezob.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/fibinute.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/081420085615.pdfIn PDF document text
    • http://flyingfish-stay.godyouoh.com/userfiles/file/bilawesubazosiromujejatip.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/6717634078.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/tobabokagafejezola.pdfIn PDF document text
    • http://rcot.by/pics/files/bajazimomonegomusulamumu.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109131626447335.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/xedaxelujasopedupapowatoj.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/vedam.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/wigosewewezigad.pdfIn PDF document text
    • https://auto826.com/uploads/files/64880799936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+active+vs+passive+voicePDF 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_off0000acd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E5 15704 bytes
SHA-256: c7de61211e043e0614e188fa4e67b0e6d56a2acca0a4d66c61efd892cd048596
font_02_sfnt_off0000ec8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8D 10280 bytes
SHA-256: 86a2631da330dbf0bcc9395896a66bb05c329e8c9e6426ca26c6a0a83aff011f

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