Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f32cd8a176ce4c…

MALICIOUS

PDF

88.5 KB Created: 2021-05-15 21:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9c53b0b78cba1d2c12d112d150da4969 SHA-1: 429df452868fac3ce83d5339320b1b7240cce62e SHA-256: d1f32cd8a176ce4cdb4d00cc31437ebb51e7e2ee065fa30f6acdebefbe40b3fc
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document exhibits characteristics of a phishing lure, specifically a fake CAPTCHA designed to trick users into interacting with malicious links. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm for SEO manipulation or to host further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to execute further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://jacksth.ru/strik?utm_term=journey+to+the+west+1996+online+streaming PDF link annotation
    • http://sujabupinoda.scienceontheweb.net/tusodumezudutufabux.pdfIn PDF document text
    • http://paselon.getenjoyment.net/tevigozevoguve.pdfIn PDF document text
    • https://lamipozalunem.weebly.com/uploads/1/3/5/3/135308558/midazog.pdfIn PDF document text
    • http://junumidutuzakox.getenjoyment.net/lorer.pdfIn PDF document text
    • https://pazijovipa.weebly.com/uploads/1/3/4/3/134327002/xarerebesobuw.pdfIn PDF document text
    • https://dexuganepo.weebly.com/uploads/1/3/1/6/131608037/3742833.pdfIn PDF document text
    • http://netekepipavosis.sportsontheweb.net/aptis_practice_test.pdfIn PDF document text
    • https://tarezusubem.weebly.com/uploads/1/3/5/3/135386237/093a3e0c03f58e1.pdfIn PDF document text
    • http://piwulag.sportsontheweb.net/tipos_de_canales_de_comercializacion.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd971817-9305-4552-9abb-4b98d1fce26a/pdf_programming_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16828077-b11e-4b0a-a3e5-efeb5bcce442/kemunozo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a211d42f-9f4b-4692-959f-0b78ae72ea4a/windows_10_games_free_download_softonic.pdfIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_89c3df6a24f94ba6b368cdc67450cdf1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/44d039a9-abdb-447a-a1d1-5e35dada483a/xovovexivizulilate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07d9d2d1-d428-41a2-9c97-c531498e94e0/fuwofowavujupirurunalul.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/wakupadejewevuf.pdfIn PDF document text
    • https://04a9e765-cf69-4035-9b9a-998d8fb4e692.filesusr.com/ugd/8c5016_e1f8fb8afac4408d9e412881c111daf9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1980bcc0-2af7-4b31-95b2-10cdde0e6e4f/90854458773.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/92516098283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d57f4a92-14d2-4407-b488-1123d65a0688/meburuzamo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C55 5644 bytes
SHA-256: 84b7185afbf24d87c9096a53c867669d9f86c2ea4658ef516a145a066457e5c8
font_01_sfnt_off00012f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F74 10824 bytes
SHA-256: 7e8d1fc702fd6f253004eb6e9c6e3f90e486b93424f5b0a973e077e0df4cc256