Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcc8ca77cc81368e…

MALICIOUS

PDF

86.2 KB Created: 2021-09-20 13:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 628f93ed7e2a068c42b7715a835333f0 SHA-1: 126db0248b3b08e30e37eed2d95f7d8d4e0a40f4 SHA-256: bcc8ca77cc81368ebc3f5b2f941393fd2f0b6f0f0db40ebc12e09e06b486aa6e
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 are part of a link farm. The ML classifier strongly indicates malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=black+clover+season+6+release+date PDF link annotation
    • http://zatoodesign.com/userfiles/files/3908311574.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/suruzi.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139276c56e89---29294424556.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/62357173357.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/3255131922.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/tijowogesinuboje.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/26471253091.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/87352709712.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/41829570470.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/41782982863.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/27961132639.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/ranidoxizejikimavab.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/sefewezojuwidatedonolu.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/zadetivazisakukivisavu.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/xixipirijavag.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/97955993506.pdfIn PDF document text
    • https://oferta.lt/i/File/58397374690.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/kanaximokodusoxe.pdfIn PDF document text
    • http://mp-journal.com/media/file/weruk.pdfIn PDF document text
    • https://webmenuplus.com/images/file/65176660595.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/87547318439.pdfIn PDF document text
    • https://argumentua.com/i/file/nimajoweviruviroxab.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/97ea1116201fee6fbe91582c8366f434/66348077097.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/4833616368.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_off0000e551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE551 20364 bytes
SHA-256: 74513ee6f603f848ab6fda5de4a44a29da2dfbb0f872c31d09ec791741ec5557
font_01_sfnt_off00011a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A92 10652 bytes
SHA-256: e54558518922a2b115c57319d0b626e5622d81546c2e7d2d54f8948e3089d7f0
font_02_sfnt_off0001333a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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