Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d82b12b27b5557…

MALICIOUS

PDF

83.6 KB Created: 2021-09-12 03:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2ee297531a4ce4f325e8ace67d21a84d SHA-1: 6a8bab6ff9e69d87fc5f4f62ef130123de61a83a SHA-256: 40d82b12b27b55576bf976754c31a750ec1bcc75109e28f76b765d69bcae05fc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable domains and are likely used to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the PDF's primary purpose is to drive traffic to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://gadkowski.pl/repository/filemanager/file/72653788299.pdf In PDF document text
    • http://cityfate.com/files/files/82351062155.pdfIn PDF document text
    • http://japhina.com/upload/file/99281645821.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/wabimewobofo.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/fumexufonagop.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/zaxiguzodojezuj.pdfIn PDF document text
    • http://retailcop.ca/files/mivopudilawubik.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/93314227439.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/dugatiloxojikusifululo.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/56937549881.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/dodedetijapojikokifumow.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/wakuvuzolitilo.pdfIn PDF document text
    • https://diphong.com/uploads/zizasoninurivejotoxax.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/36044388978.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/jegelunagemonajadoxil.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/wazivaxelulapumojigupiro.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137dd8d442f5---mutuliwug.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/38522432833.pdfIn PDF document text
    • https://rosycaffe.com/file/82565809758.pdfIn PDF document text
    • https://totounited.com/contents/files/talupesonevugobumoze.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/67166706020.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/dukuzogipuka.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/zitomogixufewosazagipim.pdfIn PDF document text
    • https://hoongnau.com/upload/files/wifexara.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/lagepobinofuf.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/9416272473.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/nibajedupubeba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+make+friends+and+influence+others+pdf+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_off0000de91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE91 18428 bytes
SHA-256: 578324b79641236129b5c6abc284948363c264b7d80101f9729b0c6032adb5ef
font_01_sfnt_off00010e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001261f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261F 11152 bytes
SHA-256: cecd6814c277486debf3479582eac8168c782716d5e2f32d0deb6f0441adb93d