Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c8b4d616936ddb…

MALICIOUS

PDF

69.4 KB Created: 2021-09-29 02:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aefb88d227b009fca9dccef8a6d0c3ca SHA-1: 362812faa19c1667bee268187e5626d6e345b075 SHA-256: c5c8b4d616936ddb42c531d368d32ba5bd05ae76df95dfd43931b108425f5b86
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured to appear as file downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://coretry.ru/uplcv?utm_term=hot+pursuit+android PDF link annotation
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/mowebidas.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/60005375871.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/84441ee16dd9d4cae4c7e173a39b9a58/sisawitexefaro.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/90238392748.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/83959299899.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/46742460171.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/remekomano.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/gekozotevuzogixejixu.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/76534665157.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/xumife.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/jedaxinosavofuzuxoro.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1614cb4191dd33---86150190334.pdfIn PDF document text
    • https://labelmarket.eu/data/file/vuzepimifif.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/sopajetabujuxafilowogoxi.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/14518540153.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/90592773074.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/41986174566.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/ligofoniwuduvobumukijok.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/36589418858.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/tikelevilafanajibijevoku.pdfIn PDF document text
    • http://ciskmv.com/css/file/sazozoxisufotababamupe.pdfIn PDF document text
    • http://safarang.com/basefile/files/34803112378.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210908123715.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/98116522213.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149580f49779---ximapotunebezimen.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/51460423432.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_off0000b234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB234 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4B 10296 bytes
SHA-256: 5f148071dacfc46987bb148e48abd61ae9e67e10b76c7bf9a4adc6be8526c2b8
font_02_sfnt_off0000e185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE185 15568 bytes
SHA-256: b329158595fdcb73125e0b3019d2bc01f1725f6c7010d0a2a7df78550086fb92