Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2ffce8c318bf368…

MALICIOUS

PDF

73.3 KB Created: 2021-09-18 15:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 25e57a7abe88531fac126e17751b59a4 SHA-1: a676a7548accf5e909556fd721c63cfca93a322b SHA-256: d2ffce8c318bf368d5dc3976f4ce9655aaa992d7a373a4ac01cca3c241d31ef2
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially malicious content or for SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 4

  • 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://domainecomps.com/documents/files/40637292001.pdf In PDF document text
    • http://longvu.vn/Images_upload/files/71288738478.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/50540263450.pdfIn PDF document text
    • http://irollee.com/userfiles/file/wiparoj.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/85238438260.pdfIn PDF document text
    • http://anninh247.info/upload/files/13169334295.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/ledoponujod.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/59865752530.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/felalisopib.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/25411909895.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/84358340403.pdfIn PDF document text
    • http://belloverde.net/emailer/file/88382793711.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/wurakawobonibejifo.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/jorogifux.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/5855768424.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/sazukatofu.pdfIn PDF document text
    • http://jainfarms.com/uploads/28199599889.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/15121439987.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/zekaziwaxivojipudanonux.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/33401559565.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/wuvamasufawilifenelarome.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441dc7c7c09---wamufolumuvobulu.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/dunas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=123movies+full+metal+jacketPDF 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_off0000b54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB54F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD66 10928 bytes
SHA-256: 0cfc320b00f1f37542e5f1fa7c994e6b5111cba8e28bcc642c39fbc9ee11949d
font_02_sfnt_off0000e6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DE 18660 bytes
SHA-256: 713f1786fdcc7b15657604438c8d40598bd1a660ff50c6864fc3c02592727ba4

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