Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df1e28885b72efa…

MALICIOUS

PDF

72.2 KB Created: 2021-09-17 03:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a72a8dd8ea015f4d2c9383ab076a9c8c SHA-1: 6af22ece1a5ead72010190264d87bd9980596a4a SHA-256: 9df1e28885b72efa117864650f03445f3e21bf0932f4028e4434c76d9ca40808
106 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are algorithmically generated and hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URIs suggests an intent to redirect the user to potentially harmful content. No scripts were extracted, but the PDF structure itself is used to facilitate malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://coretry.ru/uplcv?utm_term=adblock+android+tv PDF link annotation
    • http://marine-inox.com/i/File/65264266258.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/mipinilopasuzuvinud.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/33841824291.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/70166307895.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/ralezoleguwagoze.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/11422164545.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7a101a6cc---85507683676.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/79697080880.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/78ae084a5c2d7dd9e10087678ac1c6a5/52146689886.pdfIn PDF document text
    • https://venus-forever.com/image/files/somobinodaz.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/gafuretexo.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/76587394769.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/61042037154.pdfIn PDF document text
    • http://climtech.com/files/files/salonudizililemol.pdfIn PDF document text
    • http://jogamiskolc.hu/ckfinder/userfiles/files/95160258881.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/5005047830.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/tufider.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/sebuxitepujuji.pdfIn PDF document text
    • http://ingore.cn/upload/files/rezifozatofodamo.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_off0000b977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB977 16688 bytes
SHA-256: f342ede7492a87b5395312f24993931b377f070e936840883d491a512501ddb0
font_01_sfnt_off0000e459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE459 10340 bytes
SHA-256: 1e1430713e44fcad044cfe57251f47a678f6f93b583db7cb1b5e37ed367bba45
font_02_sfnt_off0000fbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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