Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc57ff0031e6fbe6…

MALICIOUS

PDF

70.6 KB Created: 2021-09-24 21:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f251d7b4b9e2ca61d29f6f587105f120 SHA-1: b33e35dc82151da92da2a528cac062922cf6a002 SHA-256: fc57ff0031e6fbe64928bbba2573c0ca7d15d938b874942f9f35e29880c1158f
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are part of a scheme to distribute content or phish users. The ML classifier strongly flags this PDF as malicious, supporting the conclusion of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://inwebjor.ru/uplcv?utm_term=get+1k+followers+on+instagram+in+5+minutes+free PDF link annotation
    • http://cardealer-space.com/js/upload/files/gadonadix.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/vegisolawexawe.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/kupixodexuxulebixepopime.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/45958874471.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/14209709018.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/pudakokoseredovadadomujev.pdfIn PDF document text
    • https://rjpexport.com/files/33930161564.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161392a33bf784---wufefeziletubuv.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/26562378890.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/48977093315.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/78212382737.pdfIn PDF document text
    • https://profesa.net/userFilesfile/tigokabununena.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/82460416494.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/gejagoralilapepaturexo.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109021824599469.pdfIn PDF document text
    • https://laps.pl/userfiles/file/jumofijigakuwuf.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/18100139573.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/pixiponokowufililigo.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/satamaloto.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/83330822928.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/12573486726.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/kewizepoputijaku.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/69564525488.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16141d933d9d21---93246447921.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/84907031139.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_off0000b0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B2 15796 bytes
SHA-256: 93d0c822bc9748fed0b432020b793bc6875dbc94743ec5fe81b2c31e04f97091
font_01_sfnt_off0000d87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF096 11060 bytes
SHA-256: eee59b5eb256f04f4ad2cf43f7ab7cbf35368cbc451624e8639988b66e6f1412