Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8b24051e5128bf…

MALICIOUS

PDF

76.2 KB Created: 2021-09-17 11:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 96154444ff627dc05e0302d058d9bf3d SHA-1: 91ec16840cc881b645460514d43137bf2b96e5f4 SHA-256: aa8b24051e5128bf723fab1f435f3d9f63c5834536934025d0f697ce9840281e
134 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it attempts to redirect users to potentially malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the PDF is designed to host a large number of links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=bloxburg+houses+simple PDF link annotation
    • https://basalyemek.com/ckfinder/userfiles/files/86949797203.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/10164206481.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/rewevagakejeronufelosomib.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/13501061361.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/tijemafozajidet.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/92990212775.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/16283190742.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/38670825743.pdfIn PDF document text
    • http://husplaza.hu/editor_up/52130561622.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/60626637620.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/kawuzuponexirowuz.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210909_CB7E1BA3DD101605.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/sifuzimavezas.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/wojudebejuzalofi.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/85300377280.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/59813575790.pdfIn PDF document text
    • http://vhshf.de/File/berugirogenojokitobujodop.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c023248fe4---74151650968.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/37055440443.pdfIn PDF document text
    • http://czyxchem.com/upload/files/surapibo.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/wagunuxixofubejojotarak.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/20611543077.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/86028917555.pdfIn PDF document text
    • 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_off0000c843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC843 16656 bytes
SHA-256: 8d9047f71b29b1bb3c81c5ef218e3665beccf5cef82fda4e9b50e4f8a361c0ad
font_01_sfnt_off0000f356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF356 10732 bytes
SHA-256: 587a9569f9ba9f09ff8c768ee00c63b34a12af603dc84a7a35aaa0b8695f8b06
font_02_sfnt_off00010bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.