Malicious PDF — malware analysis report

Static analysis result for SHA-256 366ac89e45d18547…

MALICIOUS

PDF

68.3 KB Created: 2021-09-27 14:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: dfe2596b32987be11b54b9cb312e02f7 SHA-1: 1cf8b13364d14904b8b7bc8226838111707432cd SHA-256: 366ac89e45d18547bc3b49cb232e065723ae1fcbfa5c9374ee403eaa1895ee01
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that lead to link farms, many of which are associated with software activation key lures. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://drafthe.ru/uplcv?utm_term=microsoft+office+365+product+key+activation+free+2020 PDF link annotation
    • https://doan295doson.vn/namthuan/images/news/files/zobuderokiburoma.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/49100973861.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/14063527186.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/vexuvu.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/kevoxagage.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/zozuzunireroj.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/ranovajiwo.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614f92256b465---12962263651.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614c9d066120c---98153308168.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614188629ef58---17011135425.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/81194037396.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/81032869321.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/fedekotemalonozagukuza.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/59426314771.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/23766210628.pdfIn PDF document text
    • http://arsvet.ru/img/upload/mefizokeroxonujije.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/bugojir.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/nenegeredigo.pdfIn PDF document text
    • https://virker-ikke.dk/files/89542489317.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/xobutuwufiraki.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_off0000aa80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA80 14652 bytes
SHA-256: 1d054eee839babacac84820c2dfad28d0149a105489fedfcf68d8d9aaf66a85f
font_01_sfnt_off0000cf68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77F 11648 bytes
SHA-256: 764753f0bb1c18e4e42c38e0a1353cb0dd10aaa7ddd581f8a362df262922f5e4

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