Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b0c967db886574…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 12:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 489c14829c4e67c7f60ff7a2e9540178 SHA-1: 4a8ebc81000c469a95cd82d6209a8b0fa19d3158 SHA-256: 52b0c967db886574e92ac96b98b138c228257fc999a2126cbfb378a1e2044bdb
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains. The ML classifier strongly indicates maliciousness, and the heuristic for a link farm on disposable hosting further supports a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or download of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://coretry.ru/uplcv?utm_term=how+to+use+givvy+app PDF link annotation
    • http://websurin.net/UserFiles/File/xigeliwu.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143c1a91550b---71358496922.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/31305165796.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/kevetugavowi.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/3711806907.pdfIn PDF document text
    • http://vucert.vn/uploads/files/99290297621.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/59457940304.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/naxakebozazoxowefar.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/49783638677.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/zanexapevitox.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/48605887073.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/31499724573.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/kugilakufimefironexawo.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/97902639952.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130d781be4d1---kabuzix.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/takabalaredemapobawaf.pdfIn PDF document text
    • http://airzo.net/userData/board/file/80577378361.pdfIn PDF document text
    • http://stroi-sistema.ru/img/3936654713.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/mutigevomupej.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/musawojonipuwimif.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_off0000dc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1B 10532 bytes
SHA-256: cade34037e1528020f703c8dc59d0a5455b080afab4a04de476a2ff47410a120
font_01_sfnt_off0000f455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF455 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C67 17596 bytes
SHA-256: a7c9e1116d832c3232bda4a30bfbb8cb3127ea060680281972c2a88711c9f7d3

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