Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e68506863626f5…

MALICIOUS

PDF

69.5 KB Created: 2021-09-29 10:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7c811fa4673d01122891a602b2c630a3 SHA-1: a38fc313d82bae83af27e965d07269277401efb5 SHA-256: 43e68506863626f511ea53a463ce44d02dd9d55546ad2dbe3fc5e34cdde7814a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to other malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggests a large number of links pointing to disposable hosting, reinforcing the phishing or malware distribution intent. The ML classifier and ClamAV detection strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nucamsa.es/userfiles/files/4811039144.pdf In PDF document text
    • http://tc-antey.ru/uploads/files/leputekokugezazadu.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/kolijufawabemovapomazuda.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/pafafujupenimivadej.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/wibosufeb.pdfIn PDF document text
    • http://healthywithhart.com/res/file/47553102873.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/popumi.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/gunexetajolugisokazigemal.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/64950981111.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/90304783454.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/lexedufalu.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/46374434235.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/manabetewonezov.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/zowufosodu.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/89653593569.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/35217026302.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/jifogiwaxesojowakejaxoj.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/52643248478.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/gitizevufiwinovosutewax.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/talagigadexa.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/mufilozumugimiginokatu.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/negegezukivojadesabegaf.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/62508244066.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/fimiwebava.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/276b3e7567a7fffa77441fa52be22dea/30461890269.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/rewosiposanozuzixamemilu.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/80061290289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=hollywood+movie+state+of+the+union+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_off0000b20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1D 14792 bytes
SHA-256: bde98a01ee7316b81ffd926afd668c6ebe56ff321a5041554982a11d984f7929
font_02_sfnt_off0000ef6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6B 10876 bytes
SHA-256: 4ec30a2550b65ce01016311ad2445e053a8535e82576ef67210515480145adcc