Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4db2cb78ba98caa…

MALICIOUS

PDF

83.6 KB Created: 2021-10-12 03:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5789e394684f458e36df7f660754471b SHA-1: 5f913b1bdc42b57336ed02d99a71aa903da83df5 SHA-256: b4db2cb78ba98caa3053819d8ab5a1bd81677eb974835366e3634d8388fd8719
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to the document acting as a link farm, directing users to numerous external URLs, many of which are hosted on potentially disposable domains. This behavior is consistent with phishing or scamming operations designed to redirect victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/08a249d7994e76e7c578ef39195482be/wutubezuwotobupexe.pdf In PDF document text
    • http://studiogaleazzo.eu/userfiles/files/vituro.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/folokafumivinabofewebe.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/dinorijewejofesemi.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/63658946278.pdfIn PDF document text
    • https://insp.biz/img/file/40212648375.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/dagugoxogi.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/mexoxoluze.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/48230941880.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/36678293410.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161362c093dd89---6841068192.pdfIn PDF document text
    • http://cascad-trans.ru/files/97869618390.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/14153226957.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/21076149156.pdfIn PDF document text
    • http://reylab.com/userfiles/file/bapuruwonapuwudaz.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/fopodeperumibekagil.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/buxonufajalokodiwuduni.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/jezeva.pdfIn PDF document text
    • http://master-br.ru/img/file/7021076200.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/burarigosufevafewaw.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/24704198351.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/xurosipomijebivogarex.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/67515763118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/6Zflnl449io/uplcv?utm_term=linear+vs+tactile+switchesPDF 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_off0000de55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE55 10316 bytes
SHA-256: 18cc05e8fd51408005933f05488d7f479b68b463ddb0860bffaf4d63551aad4e
font_01_sfnt_off0000f590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF590 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA2 19528 bytes
SHA-256: 1183fdb2fe71ded580e3142a15224e3525274afefdd529d5cbbf095d72853dd2

Open this report in the interactive analyzer, or submit your own file for analysis.