Malicious PDF — malware analysis report

Static analysis result for SHA-256 2998ddda7b9852b4…

MALICIOUS

PDF

78.8 KB Created: 2021-03-29 18:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4c0063c163018c749f808ccf31591f51 SHA-1: 72f23c13109d003d8fc7f27f05d69f1d21d46b8a SHA-256: 2998ddda7b9852b421b018916fe70307aa50a54cd5cef4241a8f05b11bb33e00
184 Risk Score

Malware Insights

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

The PDF document contains embedded links designed to redirect users to malicious infrastructure, specifically identified by the heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK'. The primary malicious URL observed is https://dafemum.ru/wix?keyword=gta+vice+city+download+apk+for+android+-+aptoide, which is presented as a download for an Android application. While no scripts were explicitly extracted, the nature of the PDF and the presence of redirector links suggest an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than 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.
  • 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://dafemum.ru/wix?keyword=gta+vice+city+download+apk+for+android+-+aptoide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4448536/normal_604a30616773a.pdfIn PDF document text
    • http://serusidam.iblogger.org/folliculitis_treatment_guidelines.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477156/normal_604ce54c79aac.pdfIn PDF document text
    • http://kumajamefe.getenjoyment.net/tijuvunibilajig.pdfIn PDF document text
    • http://diporesorojina.scienceontheweb.net/functions_in_python_examples.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378379/normal_6017880ccd380.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459028/normal_605f520a57243.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
    • http://wedutatitupaze.epizy.com/gumunesom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a29760d2-d93f-4962-b25b-b6d1deda7094/marlo_water_softener_prices.pdfIn PDF document text
    • http://jimanujomubil.epizy.com/series_of_unfortunate_events_book_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f908b03-d92a-4608-afb9-e24c66c16558/42844121819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40c544e2-92af-4c62-ad35-4b49048c513e/how_to_become_a_millionaire_with_rental_property.pdfIn PDF document text
    • http://zejuruk.rf.gd/88649895627.pdfIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_798ec865aefa4fd6bc89c527570c227b.pdf?index=trueIn PDF document text
    • http://mededulafika.epizy.com/dodibusepafikekupiludimo.pdfIn PDF document text
    • http://ninemizojunima.epizy.com/burda_style_patterns.pdfIn PDF document text
    • https://60b161a2-b511-46bc-b48c-7ca4331f2db3.filesusr.com/ugd/34b71b_e52ded6a0959473ab1fbccfbb12f352d.pdf?index=trueIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_a383027227394499a4c307c79bceaa63.pdf?index=trueIn PDF document text
    • http://kerojuluped.epizy.com/37545166111.pdfIn PDF document text
    • http://dunoziboxisi.epizy.com/things_im_thankful_for_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/793c8ccd-9a49-435e-b996-8af37ce3c8fb/kepovoregijesejukada.pdfIn PDF document text
    • https://a43ab9c2-5efb-4cee-ac06-b782a0f5e207.filesusr.com/ugd/4826f5_8b9ecac48425404b80b32a71a54461de.pdf?index=trueIn 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_off0000e91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91E 5140 bytes
SHA-256: ee27147247d1ef3b8975d8ec2aea01a0a68fe19ff78bb285227dc6e9f7bc9b37
font_01_sfnt_off0000facf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACF 11192 bytes
SHA-256: f89e57e11f9a77240b7405bdb7a0216536867b1468130e5eb9e37edf93a728aa
font_02_sfnt_off00011f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F66 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333