Malicious PDF — malware analysis report

Static analysis result for SHA-256 021f121f0864a1cb…

MALICIOUS

PDF

113.0 KB Created: 2021-09-19 10:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1c3a410b4010ca45ad531b2aef2cd8d4 SHA-1: 80b82ebf27d7c16f9ed1621826077138165034d4 SHA-256: 021f121f0864a1cb704b249f548eaa02cd3c85f1bc81177ffadbfcec7ed88042
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious, with high confidence. It contains numerous embedded URLs pointing to external PDF files, indicating a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests these links are used for malicious purposes, likely to distribute further payloads or conduct phishing. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://www.creativetalentnetwork.com/ckfinder/userfiles/files/lasefedudefo.pdf In PDF document text
    • http://lab4050.com/upload/editor/file/romanil.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/39807693144.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/wefexepora.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/bojed.pdfIn PDF document text
    • http://sdds.be/userfiles/file/dowedeluvupun.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/18065313095.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/98252031708.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/xujopusifurebosi.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137675414cec---46157230703.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/23871206967.pdfIn PDF document text
    • https://atiksigorta.com/files/mowonobebosuxelov.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/93157575357.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/jorobapegiz.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/49181127688.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/32942085513.pdfIn PDF document text
    • http://delve-cr.com/uploads/8158278054.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/47629957121.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/fowijeben.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/nepit.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/firisifademeviniliw.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/26027569045.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140ffce93ad8---xatowatarapemezevarurofum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=warhammer+40k+9th+edition+core+book+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_off00014fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000167d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167D2 11264 bytes
SHA-256: 8fd346f98a12bf59fffba7d6c4324de2b279b0c4e3f8a0ff6b3e7c86cd6b95ec
font_02_sfnt_off000181de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181DE 19920 bytes
SHA-256: 2f7c02e2153c69a0c7d168a1ac1012a5bb53a9ce10df27e1d1f7e4bc8823b212

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