Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9950329d4cb76ed…

MALICIOUS

PDF

78.4 KB Created: 2021-09-16 21:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3e7e54ec5e77526163a38f5fb9b78dda SHA-1: ce13cfcffbbe8cd45c0097ac2df4588fb5d72bb9 SHA-256: b9950329d4cb76ed6cc6789c6fe6b5a777e8d60ec7e3b62595376e5f885442e7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on potentially disposable hosting, reinforcing the phishing or malware distribution intent. No scripts were extracted, but the overall structure and URL density point to a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ketchas.ru/uplcv?utm_term=five+major+muscle+groups PDF link annotation
    • https://next-engineering.com/userfiles/files/zuniwuxuvirag.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/kojob.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/fonifumuni.pdfIn PDF document text
    • http://ingore.cn/upload/files/gizodoboku.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/34391086820.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/wekesularidoxafurelurupux.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/52105265556.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/45743388292.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/xobetosogofomo.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecf0b3777d---bagisopuxoxup.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/70484204752.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/fogunadojumikenowekiva.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/piwerona.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210901_1747C39A10E81FE8.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/78954210169.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/92687918430.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/34303462646.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/68826774859.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/dff9317d4ee2e5c7c59634c447822c0c/18391160547.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/31161612290.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/vurewanedutisegu.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/88281787204.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/ferojivolipiterape.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_off0000cffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE815 10788 bytes
SHA-256: dbd39e3f2dc180f73bdf98fea524ef2698bc6239ac1a39380d647cc21e138942
font_02_sfnt_off000100e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E8 16780 bytes
SHA-256: 922865827120360a9c1742f17de564bd243dc018012f9207e8771c4201d0038a

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