Malicious PDF — malware analysis report

Static analysis result for SHA-256 416aad252ff08b7b…

MALICIOUS

PDF

68.8 KB Created: 2021-09-10 09:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 106734250016f5ae77e927204eb22333 SHA-1: 90217a59e37ff99e4cc076eb1fd8c02050f3bd5c SHA-256: 416aad252ff08b7b9a66716b57df526fdf5229b1cb4e46adf6300798c08cc832
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is a link farm, and numerous URLs were extracted, many of which are hosted on potentially disposable domains. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to redirect users to malicious sites, hence the inclusion of T1059.007. The overall pattern suggests a phishing or redirection attempt, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://portaldeaquidauana.com.br/ckfinder/userfiles/files/85262970456.pdf In PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342c0103983---limowelejoziwutigo.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/saboguterejewewo.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/waripamida.pdfIn PDF document text
    • http://caramelitos.sk/files/tojeginatenos.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/6844601136.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/2249722251.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/rasot.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/dekapebemebowelowe.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/mimijiwelinajuwogu.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/fakuxi.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/datexozofowamigefugoduxij.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/panezajapo.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/bojupewo.pdfIn PDF document text
    • http://okvin.org/userfiles/file/watosamizavofugozufe.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/jiwojizutepaxugu.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-6/20210906061258966586.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/mogufapogubopom.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/35855918967.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/bifapiwosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=wanted+full+movie+salman+khan+2009+full+movie+hd+1080pPDF 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_off0000ab51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB51 11584 bytes
SHA-256: df7247cd4b913e549bf811bacb05a2a0a325d188b4fa853c9f25a6db70735619
font_01_sfnt_off0000c6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BC 15372 bytes
SHA-256: 3a82f0c3e243b5da65558031be09852d5de95de22b0b536181c60c75a65c43d1
font_02_sfnt_off0000edab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1