Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1ec1e0ff691f2b…

MALICIOUS

PDF

138.6 KB Created: 2021-10-14 10:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: d2d98f3de0bbec0ebb01cde0ec9b317d SHA-1: 90e9cdbf0237504a16528c2288c714ab5ab2cc9e SHA-256: 7a1ec1e0ff691f2bd516d53f94cc52f146cdda303e4451508d9f4182d6ead280
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and URL distribution point towards a common tactic of luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 http://veronikavilla.hu/userfiles/file/50710424997.pdf In PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/foredod.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/davogagusi.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/50281433916.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/jufujerunepab.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/salitifagakejekamiriga.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/87486172329.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/77326850491.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/89700684752.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vobilapilijewozetin.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/pitukafegeguvaduxitopafo.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/linakivil.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161538ce149720---15489941771.pdfIn PDF document text
    • https://semut73.com/contents/files/19933115022.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/naronatutuziregebuz.pdfIn PDF document text
    • http://azizolace.cz/images/file/nekopun.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/65166581365.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161574e9fad520---67841615813.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/43534480894.pdfIn PDF document text
    • http://fteq.ru/files/file/fupurotanuxixibabo.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/kekasolonenuwi.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/gasulefed.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/KGDyd8lM0uI/uplcv?utm_term=the+delmar+divide+documentaryPDF 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_off0001b506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B506 10712 bytes
SHA-256: a6e197a86a290939fdc1f9e7303da662972e28260cea424ebcbef32593074fc9
font_01_sfnt_off0001cd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E57F 21624 bytes
SHA-256: 094f3b1dd92c57b7c63cfe46b1eed725717634bfd3ace6cf18183e57786140f3

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