Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0a81408f870ded…

MALICIOUS

PDF

79.6 KB Created: 2021-03-03 07:48:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 21dceade02e14b4e81d8f8807570194a SHA-1: 6e5be97e94274c367ae3e858fabe9b1d9bbe9dec SHA-256: 4f0a81408f870ded6077cec6ca3e45cb6a8124c34572ed7c96d89e633433c6e1
142 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating a high probability of maliciousness. The presence of embedded JavaScript and external URIs pointing to disposable hosting services suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the conclusion that this file is part of a link farm designed to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lozipotod.ru/award?keyword=turtle+beach+stealth+500x+xbox+one PDF link annotation
    • http://vash-fasad.live/arcgis_10._3._1_crackhy5pa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497110/normal_5fff7d056da8a.pdfIn PDF document text
    • http://sevisotesasare.iblogger.org/blank_brochure_templates_ai.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393016/normal_5ffea68ddb789.pdfIn PDF document text
    • http://fijixedi.22web.org/firefox_60._0._1.pdfIn PDF document text
    • http://converstarget.ru/galaxy_guardian_space_shooter_mod_apkhpzs8.pdfIn PDF document text
    • http://nitapida.mywebcommunity.org/25431309708.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463785/normal_5fe3d6b307b6d.pdfIn PDF document text
    • http://flowerport.market/46530760757k470s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425010/normal_5fe4a94f1dfad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tokeximu.epizy.com/24444638708.pdfIn PDF document text
    • http://xurosuforudev.atwebpages.com/oral_b_pro_1000_crossaction_review.pdfIn PDF document text
    • http://jawedujap.rf.gd/law_abiding_citizen_movie_300mb.pdfIn PDF document text
    • http://vogidide.epizy.com/management_discussion_and_analysis_report_2016.pdfIn PDF document text
    • http://buposubugoromot.rf.gd/gimeburugawedujabejilom.pdfIn PDF document text
    • http://sanobinam.rf.gd/togulugisawarebavuxotef.pdfIn PDF document text
    • http://dakubevudepobat.rf.gd/how_to_setup_my_voicemail_on_my_vtech_cordless_phone.pdfIn PDF document text
    • http://buwozefavimim.epizy.com/filmorago_for_pc_windows_10.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_off0000eddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDB 5312 bytes
SHA-256: 6e034cc0284b5e0d290608b64668c7bba3885b7b48edb99305cfe44c0c67f2ab
font_01_sfnt_off0000ffe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE4 15332 bytes
SHA-256: f149e3ab3bd602732df67914fd24fb392ef456a179b385576898694181818096

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