Malicious PDF — malware analysis report

Static analysis result for SHA-256 25754d46285b59b0…

MALICIOUS

PDF

80.9 KB Created: 2021-09-22 21:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ce0d861b8bfab6080a8bddebeeb1a5d3 SHA-1: a971c260cac59846201de6c6249293aa877b060d SHA-256: 25754d46285b59b072cf92c9bfc6a63173363d7a10df0cd5250f2b99e6779471
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a potential link farm designed to obscure the true destination, and the presence of external URIs suggests redirection to malicious sites. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it's used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://okmarin.ru/userfiles/file/11877314895.pdf In PDF document text
    • http://csigikes.hu/admin/fck_upload/file/wogidemewif.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/nirusotila.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/japazovegisozoderemivatat.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/wotajapobixida.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/woniwujum.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a0f0d80471---60624122446.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/zexuzalevadatilig.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/muvesavofefaluvuvup.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/74213222499.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/91296753453.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/wemomidulufefolidipuluvuk.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/tibip.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/dutadepefemofasuv.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210906_E454BBFF9B0F5219.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/83307648940.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/26589723908.pdfIn PDF document text
    • http://pedraferro.com/files/files/91990551297.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/winidivixiteramut.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/fajonunagagibukuwexovi.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210906181322.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/80b45e9c570ec14a4081a846167a544e/78640393223.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/77267256347.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/gavigegekisulutowixamuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ashes+cricket+download+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_off0000d41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC30 18872 bytes
SHA-256: dc2ea0ab2bc624487caf9c76a519caeb24e1051a46ac556f036a20c37e1cfa92
font_02_sfnt_off00011d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D26 10732 bytes
SHA-256: 9813805325033a0a0d115b0cec8fd8df7aedbf4a560c6e6f9f5b91b589c8d796