Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a9ffb222821314f…

MALICIOUS

PDF

74.7 KB Created: 2021-09-17 10:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5bf19e349427d15757cee4886edccfab SHA-1: 9cfc3f3e1a56ce04472c13fff44cf2a86e07686c SHA-256: 6a9ffb222821314fc097c318a2d5456d602ecfb434f340b5879e9b5d878303a7
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, indicating an attempt to redirect the user to malicious sites. The ML classifier strongly flagged this PDF as malicious, and the presence of JavaScript suggests it is used to facilitate the redirection or download of further payloads. The numerous links and the nature of the hosting suggest a link farm or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=pride+and+prejudice+full+book+online+free PDF link annotation
    • https://foulardfotografando.it/file/93899145061.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/70261368369.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137da8fc0df1---62262356789.pdfIn PDF document text
    • http://markone-tools.com/upload/files/34982649035.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/24810041641.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/44468348236.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/podejigaxi.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/q0568vbf8umuno1linnprjcmj6/dovobadujazajegokutafoxup.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/givogilajowovemoxax.pdfIn PDF document text
    • http://ave-france.com/pics/files/64218301578.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/93919247179.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/53782925048.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/22146403314.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/kuganawuwezuforosamuj.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/noguwup.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/jabakomoxebevikolo.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/bomebutegasekaxituf.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/56278931759.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/zizisabidirelu.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/50403729986.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/83185957882.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/zoxogemikatumajisovubodo.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/gewabirojebilajowe.pdfIn PDF document text
    • https://clickbox.ro/images/file/gekoxuzafatazepiwubuno.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/ribikor.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_off0000bf33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF33 10812 bytes
SHA-256: 20a82a6cf10acb3b66fa3d8a8ae8051e2c301f33b1e4bf49860b77234f642aca
font_01_sfnt_off0000d7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E1 17504 bytes
SHA-256: 6fd6c322246af2239761ce1a962d045b0f11d42ae6ca123c356182a0b5bba5a2
font_02_sfnt_off00010510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1