Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebecaac61ad9c755…

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 11:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7b1992b54f224632eea9734ded50a7f4 SHA-1: b381d3ae25682f620855ca3475dc40e563ba1a78 SHA-256: ebecaac61ad9c755114dc12c054a38e6653c2a4ceaed05ab9baf5cc99f9f2e26
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs, many of which point to disposable domains or are structured as link farms. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to redirect users to potentially harmful content. No scripts were extracted, but the sheer volume of external links is a strong indicator of malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 4

  • 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://the-bom.kr/upfile/files/bazumibiduzanapib.pdf In PDF document text
    • http://offerseir.com/basefile/offerseircom/files/80942138715.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/92104548739095799fd5f51801fc5a28/tuxupo.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/podavurixilojuxerupu.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/dobitopuzod.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/jezeletinumajufi.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/pubepelaweduzezejikot.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/21251678215.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/mofawadogiret.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/87738453817.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/28905841940.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/6376253440.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/zakovonotasuz.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109140630512982.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/rosamilojilaxasikemo.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/88523849131.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/32607678729.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/goniwodi.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/xibaliruzakufajojuvoma.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/nijusetufesopowefubi.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16138be6558dda---mosumomawun.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/rixekasu.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/tapapeganowaxike.pdfIn PDF document text
    • https://jin-ji.com/upload/files/lulawaj.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/mexan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=bitlife+unlimited+money+2020+apkPDF 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_off0000e221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE221 17476 bytes
SHA-256: 6234f6f195addf5ba366670dc103eee436b2ba6b2c57a65a182c65669859fa15
font_01_sfnt_off00010f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F53 10992 bytes
SHA-256: 925520ee8915fbaa138a9d0f89e9e338b650ae5977fca11b2ca0ef40827a2677
font_02_sfnt_off000128ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1