Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce77e30c222ec753…

MALICIOUS

PDF

80.3 KB Created: 2021-02-27 17:12:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2d205afa68a4470096aaa1be71476348 SHA-1: e03ecf7734713726d372e057eba407472adbcf18 SHA-256: ce77e30c222ec75335ff75788d4344af64c17e1e58a9f7c8463265a508a25a4b
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many of which point to disposable hosting and utilize UTM parameters, suggesting a link farm or phishing lure. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate that the document's primary purpose is to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=samsung+ubd-k8500+dolby+atmos+settings PDF link annotation
    • https://cdn.sqhk.co/rubuxupab/igeA2gi/space_frontier_2_online.pdfIn PDF document text
    • https://cdn.sqhk.co/butituguxur/khijihi/juxexubekonesijebofam.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/l3ojfie/how_to_play_poker_in_valentine_rdr2.pdfIn PDF document text
    • https://cdn.sqhk.co/silakozafi/UMcsbmk/47154937944.pdfIn PDF document text
    • http://mif-smeh.space/airline_tycoon_online_freed8avj.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/starbucks_mocha_frappuccino_calories_uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463807/normal_5fd642ab7fcf4.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/present_perfect_subjunctive_spanish_exercises.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451737/normal_5fcae5c12bda5.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/paragraph_structure_worksheets.pdfIn PDF document text
    • http://feyakast.online/dijatepirakiwurapikapur2ydq.pdfIn PDF document text
    • http://vinograd.io/kegaxamlshzc.pdfIn PDF document text
    • http://edalovert.xyz/canela_movie_charactersllxlq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/varolexexus/boyfriend_justin_bieber_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/singer_fashion_mate_computerized_sewing_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/daily_planner_template_editable.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/81876076300.pdfIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/wafusavezafoxutovariputan.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_off0000fb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3F 5948 bytes
SHA-256: 371749dcded64178542cb458aee9329a3d7679bb075212dfdd10fca6d9914a08
font_01_sfnt_off00010f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7E 10716 bytes
SHA-256: c52e9d33e69765c898b387dea029277b0f263381fcffdad40907b464f1627932

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