Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebdd9b0dec3478cf…

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 20:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4c2029d774d2b847b8ce62b3547a072e SHA-1: b41db4bad592bc18299b8b3e419e108221489fc3 SHA-256: ebdd9b0dec3478cffcb15bad69222f5152f9408117358bfacb2ee408c7d50bb2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=android+phone+to+pc+file+transfer PDF link annotation
    • http://giorgimpianti.com/userfiles/file/toluvuf.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/99699873729.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/penijebuvufalikopevawif.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/tapifufevovalogiwa.pdfIn PDF document text
    • http://willbramephotography.com/67393103616.pdfIn PDF document text
    • http://3234.us/data/attachment/file/64004693200.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210921200007.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/fovogejigi.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/nudufufuwufoju.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/81039294120.pdfIn PDF document text
    • http://zae.me/datafiles/file/suvuvoxefemevozanigofar.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/74463794619.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/34823432148.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/gobumosaxabofowuxawu.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26687549650.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/neworijukitixamoso.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/46620566122.pdfIn PDF document text
    • http://tcihk.com/userfiles/lopufodolikixemapamoj.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/48336360459.pdfIn PDF document text
    • http://vibratingsieve.com/d/files/jagoxavukazokutuzax.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/95828075857.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/98223629903.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091101253473499.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_off0000b025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB025 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC837 17936 bytes
SHA-256: 50558da3723db0dd30fb85183d36c859c0563120cc755c0f2c430cce0fca5ddf
font_02_sfnt_off0000f585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF585 10696 bytes
SHA-256: 38cf30d97575285aac49d3f6c4ffd0096b0d59cd1e7e6f10186728d921598306

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