Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc1e5c82a93e57f…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 04:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 50c81aa3936cf02efe8c2f6499041952 SHA-1: 5407516be9dd491b29adbdf278f578209d689dff SHA-256: 4bc1e5c82a93e57fdea8f601c3e76efa25a315a9a695c756946dc644b0b9462b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to potentially malicious domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a link farm, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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 http://marleenjansen.nl/images/uploadfiles/vugorigetalawuzexutifapuz.pdf In PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/bilapifisugegelaj.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/bimitamujuwamamoveziv.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/kiwapidedufodas.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/170255115239.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/kegurukurakolulufopobomo.pdfIn PDF document text
    • http://gro-felix.si/uploads/noliri.pdfIn PDF document text
    • https://blugarden.eu/file/63662431014.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/folovelimafukajikor.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/eb614ajtfg4a2udsbu3b041qcb/31299480494.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/69526202498.pdfIn PDF document text
    • http://klientskazona.radeton.sk/ckfinder/userfiles/files/99105955282.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/43607097750.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/62301286604.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/zepenekoxar.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/porozatuzosibaxesubo.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/bapidogap.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109100551229985.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132570ddf9ba---76056764030.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/muwegoz.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/98983491941.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/93050194252.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=youtube+videos+not+playing+in+android+appPDF 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_off0000df14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF14 16732 bytes
SHA-256: 7f0e05b78a8e2b264cd92c88849b5e1ae33a8c13c4590420fc71885d79648cb2
font_01_sfnt_off00010a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7A 10968 bytes
SHA-256: 2a55e6fe22f086c2e372ca7813769d12d2e7cb5f3e980266f661823502beb60c
font_02_sfnt_off000123ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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