Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b324c14133ff8a8…

MALICIOUS

PDF

81.8 KB Created: 2021-09-11 02:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8bcab6bc5f0d5fe540ce0b87a474311d SHA-1: 07ac84ff3d3e0f6476bb86c89a0782501ed792e9 SHA-256: 5b324c14133ff8a895527d4dc1e8a7b6cf41fe173e472d206a1233919f172b6c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to distinct domains, suggesting a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pengyou-english.com/FileData/ckfinder/files/20210910_2D8F90E84A2B7098.pdf In PDF document text
    • http://antonioruizabogados.es/userfiles/file/webexotemikanot.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ed11eb00336ccf586ef41dee87a828dc/kuzejodegu.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/74292142641.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/89442899861.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/sixuzara.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/22917379075.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/wedipivilelaborajibi.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/gijut.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/63990360167.pdfIn PDF document text
    • http://partnercable.hu/files/61913489066.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/lijanelofiwokusupivurubi.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/34509280983.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/mejexix.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/82185580611.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/17247272420.pdfIn PDF document text
    • http://www.pvvc.cz/files/jeselugipurixufuxogujamu.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/lodijinuwazusolaw.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe27b994d---raxoguliduvutibalamosewaw.pdfIn PDF document text
    • http://mayjack.com/upload/files/kozigupebuja.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/wavigaxefijesifipegubil.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/sujafuxaxusojupiguz.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/47244099306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=diskdigger+hack+apk+downloadPDF 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_off0000da37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA37 10876 bytes
SHA-256: 48f46bed14101609abf5675314e30750f53653e5cc5483d068e7134c93fb4dcd
font_01_sfnt_off0000f31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B30 17916 bytes
SHA-256: b305ec5ccb007272b0b7f9bfe271c174622a3d96648beeb25b06bf7c167cb52e