Malicious PDF — malware analysis report

Static analysis result for SHA-256 b13baad1c5351f73…

MALICIOUS

PDF

71.1 KB Created: 2021-05-13 03:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: cf72489ae374d66c7c1425f96d879c2f SHA-1: b82eda9c1c3a12116edc47d7dc7a8281271e832c SHA-256: b13baad1c5351f737e03ed9548882323ca12e5af56887002d35d32ebae2869db
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and one specifically uses a search query as a parameter, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://kuzutuzo.ru/strik?utm_term=divina+comedia+italiano+pdf PDF link annotation
    • http://xifasiv.getenjoyment.net/siwovowawu.pdfIn PDF document text
    • https://cdn.sqhk.co/fepebage/jaNuji8/putulajarutavo.pdfIn PDF document text
    • http://sabazat.22web.org/bismarck_foreign_policy.pdfIn PDF document text
    • https://cdn.sqhk.co/xufuwejaxe/ijjcnwU/rokusilatuvi.pdfIn PDF document text
    • http://texivej.sportsontheweb.net/artificial_intelligence_python_code.pdfIn PDF document text
    • https://fudiditinip.weebly.com/uploads/1/3/1/4/131453724/wijazudegago.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/52068166559.pdfIn PDF document text
    • http://zefutuwukeras.getenjoyment.net/59903038713.pdfIn PDF document text
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/f38c04719c.pdfIn PDF document text
    • http://pakekoramiduwin.getenjoyment.net/telejumeme.pdfIn PDF document text
    • http://rezisekuvaz.mypressonline.com/ethiopian_criminal_justice_system.pdfIn PDF document text
    • http://fovoxarofej.getenjoyment.net/26338312738.pdfIn PDF document text
    • https://cdn.sqhk.co/rozopebak/aUtgejf/best_golf_hitting_mat_and_net.pdfIn PDF document text
    • https://cdn.sqhk.co/kupibetefuko/hhyjgjh/mirimiweje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://f4dd034e-00c7-465c-b850-fb2d75accad5.filesusr.com/ugd/769f78_e102698c558f402d85d99c93b45064b5.pdf?index=trueIn PDF document text
    • http://zolorivitobas.rf.gd/coleman_furnace_blower_fan.pdfIn PDF document text
    • http://sesaziroderud.epizy.com/definition_of_social_studies_by_different_scholars.pdfIn PDF document text
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_a50d0a06229a4a03858ce3fee80d5a68.pdf?index=trueIn PDF document text
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_0720da8524c9423b8a2ad62d05f2514b.pdf?index=trueIn PDF document text
    • http://xikapewegoruzom.epizy.com/sebixij.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA31 4876 bytes
SHA-256: f4d175e041c4c9baef20f352749aeb907c19911894bb570078f64de899a8c197
font_01_sfnt_off0000dab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB0 12048 bytes
SHA-256: 1b31107167ea330a5e3dd3a7006925c3085c71fc57df894d85bda41eb4c38a5e
font_02_sfnt_off0000ffae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAE 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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