Malicious PDF — malware analysis report

Static analysis result for SHA-256 0da08a669efe5929…

MALICIOUS

PDF

80.7 KB Created: 2021-09-14 21:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b0bdbeb8bbb34b5f9a2bea5bef6d29a6 SHA-1: c303edaf5da435a89f6778c48d4657a3d600625e SHA-256: 0da08a669efe59290b862681cdbf0a8d1bcb77bb7eff365037af66bbea6e7430
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, commonly seen in phishing or malware distribution campaigns. No scripts were extracted, but the overall structure and heuristics point to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://axiomestates.com/userfiles/file/dilewa.pdf In PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72247585366.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/pakadipiwaravexukapano.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/8129427021.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332bb1d0ad3---gekave.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/jopefivosirasedaralix.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109131044158192.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/suvuroweb.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/2569649325.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/57494982109.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/95584860401.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/xetozinipewazibi.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/55138748662.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/migetanizepuji.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109060723443554.pdfIn PDF document text
    • http://emannsltd.com/userfiles/wakigejox.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f750ef7793962b145d7de51f30e326fe/16632566183.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/bovuzipagowenomigekumo.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/fevinuduwifinojovakadim.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/risulituzujeniboz.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210907050407.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/35776214299.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/mosunetisofizusopawum.pdfIn PDF document text
    • http://tearose-kitchen.com/sites/default/files/images/imcefile/nuvemezaruxorovuwatafosi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=best+pdf+app+for+windowsPDF 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_off0000d746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD746 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF58 17648 bytes
SHA-256: f3239a61bc97e5ec28e972e7a46bf8db47141a4412a1f06b06daeebde1cd1134
font_02_sfnt_off00011d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D34 10584 bytes
SHA-256: 36e39548dc219c6abe4dded20ebec194699de91882ae88c97e701fb3f8429b72