Malicious PDF — malware analysis report

Static analysis result for SHA-256 b086e6582ac47798…

MALICIOUS

PDF

73.8 KB Created: 2021-09-09 11:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5c1ba37d21131033616281ea0f3c4a95 SHA-1: 6e2890bcf458ce89d4d6c8696e14d005e9223549 SHA-256: b086e6582ac47798b25824acd66a88ec2a815b2dc5a79280feaa6b795ffa0a8b
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to suspicious domains, and is identified as a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of hosting many links on disposable domains, suggesting an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://www.htlexpress.com/ckfinder/userfiles/files/bovifuwamoxapor.pdf In PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/13484796337.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/93198077432.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/57414384278.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/mokusozizalex.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/79619800924.pdfIn PDF document text
    • http://katachizu.com/img/news/files/90458784282.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/28552801528.pdfIn PDF document text
    • http://chayka-svg.ru/files/32834677384.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/betomewikaxesunimoli.pdfIn PDF document text
    • http://fitviewer.info/files/file/48461339504.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/25323181030.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/lanamonujopeza.pdfIn PDF document text
    • http://castel.lu/userfiles/files/63465655169.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/xuvefedoxe.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/45540376420.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/38142720669.pdfIn PDF document text
    • https://invision.buzyhub.com/files/nivapinuzuxab.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/lezovupotox.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/79196492747.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/vijariterojiziv.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/sixadotajabu.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/gudifizezuweponitaneg.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161307d5046a03---purejesunuwu.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/fanukuboxuvegarodirezafan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=form+in+art+elementsPDF 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_off0000c28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA3 10244 bytes
SHA-256: ac428331080010f397ecdf847ef80f8a6b9a6a46d838e061b35b683617886f42
font_02_sfnt_off0000f198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF198 15732 bytes
SHA-256: 5cb3e7ddd5b78abefca269dd24f35c61f987132f7734f7f4a3782903baf20ce1