Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0e54bfaf5a94cc4…

MALICIOUS

PDF

87.0 KB Created: 2021-09-13 19:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cd1cf24a9fdab423de5587ff8ff8ff69 SHA-1: 4402906c6b3a8c609c018f7af854aaeab75f6209 SHA-256: b0e54bfaf5a94cc4cfb6ca11c277c6402016d10b98626c69065fc601f6f3fe0d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded content, while heavily obfuscated, are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://vilnius.cvzona.lt/resources/img/files/91264275756.pdf In PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/16255253013.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/63046546308.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/25778501577.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/399771c7ca13cfd7394a9a9174244bec/bofutupofobojajatetopas.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/wisofodojiber.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/15169206616.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/47423568273.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/vinijewasodoxedelofisabi.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/11782572638.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/vaxira.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/44864251690.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/15099534576.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/80673257602.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4ba1b89cf---88494017197.pdfIn PDF document text
    • http://gazetavk.ru/img/file/nobakadifizebovokiwetiw.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/10723079910.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/kopupulilepuj.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/sileputabose.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/fafamotesilinibaw.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/81974167613.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/15281704627.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/wixiveregekag.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/23393611978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=best+air+simulation+games+for+androidPDF 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_off0000ed7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7D 18720 bytes
SHA-256: 49071245596c74a7b215a9c010a084738cc7f5590ca7f146aff57cf1512ed7d0
font_01_sfnt_off00011dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC9 10848 bytes
SHA-256: 1bbd72e50f6652928091d9746abf8d0df13d76691042516013898e9a4c5874d8
font_02_sfnt_off000136a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1