Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f83d0319c7d67a9…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 09:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bf7e0175e0951ee22e9f537b615335f2 SHA-1: 6bc3917520f0a44cb5f867fe4424916f84515aad SHA-256: 1f83d0319c7d67a90bcff2fa372eb2f7016fa41ee71b8d5dda66ef4f9efdf4bc
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7219

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.
  • 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
  • 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://gencerenerji.com/resimler/files/bituxajepesi.pdf In PDF document text
    • https://matharu.ae/userfiles/file/60130316422.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/sedebadezisovezajavafixu.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/46665276375.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/3218915579.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/ludarinexuw.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/93404756467.pdfIn PDF document text
    • https://moolans.com/uploads/files/15764762838.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/gifefizegugulisizexu.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/79704095872.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/nonuzawunudesowifog.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/dedut.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/62665293143.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a939f030c---46162970636.pdfIn PDF document text
    • http://brlairport.com/images/file/30774100245.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/84251327942.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/jutanavuzav.pdfIn PDF document text
    • http://arsvet.ru/img/upload/76175036772.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/42766586332.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/35344163042.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/riduvuforaxarusez.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/kanegitil.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/wototodupobawogalipu.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/teboni.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/7b09322d2709e5cebbac2a821829a43e/gixefaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+stepford+wives+book+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF01 10628 bytes
SHA-256: 3bdb273afdc36952da7bafde7d68b15bbe893ff319320c005a3177632b9cca81
font_01_sfnt_off0001074c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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