Malicious PDF — malware analysis report

Static analysis result for SHA-256 61db8e994d415122…

MALICIOUS

PDF

80.2 KB Created: 2021-04-20 04:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0e2744746eea068a3b23bd946193b2e9 SHA-1: 25b75293888b0ccc61f8e954af2d6332c9514f0e SHA-256: 61db8e994d41512292b53d2f523c244a60d92c470c2b0e57bb644c417cf0a015
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs that are part of a link farm, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or lead the user to a phishing site. No scripts were extracted, but the presence of multiple suspicious URLs and the document's deceptive content point to a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=how+to+find+model+number+on+hampton+bay+ceiling+fan PDF link annotation
    • http://dolekil.22web.org/adobe_reader_online_converter.pdfIn PDF document text
    • https://tipoxuxol.weebly.com/uploads/1/3/0/8/130814923/jetopereti_welezabizukixi_vopemuf.pdfIn PDF document text
    • http://taxiditugivubed.iblogger.org/20226018009.pdfIn PDF document text
    • https://gideturifit.weebly.com/uploads/1/3/4/8/134887905/7256180.pdfIn PDF document text
    • https://baxolelal.weebly.com/uploads/1/3/4/6/134625426/dd6df840ec14.pdfIn PDF document text
    • https://sozobuxetezubu.weebly.com/uploads/1/3/4/5/134527793/feworazokal.pdfIn PDF document text
    • http://vabuletarikinil.iblogger.org/46877210087.pdfIn PDF document text
    • https://xokiguju.weebly.com/uploads/1/3/4/6/134679394/mamusurikofamipuzeji.pdfIn PDF document text
    • https://dadekubezaxinis.weebly.com/uploads/1/3/2/7/132740399/3caebc9.pdfIn PDF document text
    • http://bonenipani.22web.org/7688846746.pdfIn PDF document text
    • https://kufudazasa.weebly.com/uploads/1/3/4/6/134626120/8053961.pdfIn PDF document text
    • https://gawudizilox.weebly.com/uploads/1/3/5/3/135300959/sazirir.pdfIn PDF document text
    • https://sekeratogo.weebly.com/uploads/1/3/4/6/134683690/ninivevarepen_naxazope.pdfIn PDF document text
    • http://subuvotugijad.iblogger.org/catalogo_avon_campaa_16_2020_argentina.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/36c69b57-07ad-48af-ab13-3630a96fe5e8/99714906868.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca4a5217-882a-4c4b-861d-f53f439c4b3f/how_does_an_electric_car_engine_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/455f4488-9f97-4799-af97-b95feb1a2199/96208580306.pdfIn PDF document text
    • http://pisozew.rf.gd/bourbaki_elements_of_the_history_of_mathematics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20917f7e-d6f0-4f8e-9406-61f3361c9808/what_can_you_watch_news_of_the_world_on.pdfIn PDF document text
    • http://ziputira.epizy.com/maintenance_management_system_in_building_construction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dc1b154-3967-45d4-8a70-6fcb1aaa9b6a/is_esl_considered_a_disability.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f62cc865-d22e-4a13-9618-0127359d5870/wegogito.pdfIn PDF document text
    • http://xivajaraseb.rf.gd/wojunuvexonowobafel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f4dc18e-eeaa-484e-8e85-fd7099040b77/tudadukelibubasanigofulat.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_off0000f797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF797 5684 bytes
SHA-256: ecb1864b13e2a5b15960b95b37cedca481e27137a5baf359b3839e66c6d25483
font_01_sfnt_off00010adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADB 11768 bytes
SHA-256: 1add0c77040bf8a12d3d4ae2e6b7eae1b0c092a937f481828b7b55dcfff30ba2