Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e73aa322e00c7af…

MALICIOUS

PDF

83.8 KB Created: 2021-09-11 02:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 01c213609b5b70a0dec0d0899b1bccf6 SHA-1: 51d393fc9e097b35c74ff6a844e24334f6b874f3 SHA-256: 8e73aa322e00c7af372b49581d17a3a8f941322cff204f53472b39826684f32f
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a heuristic firing for PDF_SEO_DISPOSABLE_LINK_FARM indicates it is a link farm on disposable hosting. The embedded JavaScript likely facilitates redirection to the numerous external URLs found within the document, which are presented as a link farm. This suggests a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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 http://chafewyuok.handysociality.com/upload/files/62735072774.pdf In PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/gc28coe9l22l6vdulni459necp/gigejaxasiwumerufudan.pdfIn PDF document text
    • http://ijfbn.com/editor_up/korika.pdfIn PDF document text
    • https://webmenuplus.com/images/file/wabexam.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/vapefagezapewagefu.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/13202612582.pdfIn PDF document text
    • http://szcftz.com/upload/2428042947.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/23410178419.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kazerefegen.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/29147743366.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/welujematikuragogavak.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/51832258481.pdfIn PDF document text
    • http://ucokampen.com/media/files/kejizopowovuva.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/xirilusawifafubenugupa.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/limifos.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/33529319249.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/tisasegewijifivizepobuti.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/34635384815.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/55312967494.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/razazuku.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/girupubezagetivazufen.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210902100044.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/54388108300.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613797f3dcf94---13840133093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=best+file+explorer+for+android+tvPDF 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_off0000e237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE237 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA49 18084 bytes
SHA-256: 237ef364a4d20cd59c6ba0872ca5e59e8d0e9f4e6f40f6d412bbe9a9720efac1
font_02_sfnt_off000128ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AC 10712 bytes
SHA-256: 350691e868ae6f83a17f5046c54510be70bc7b74c3901d7034a577fac317f7b6