Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f57eb89ceb46ac…

MALICIOUS

PDF

80.1 KB Created: 2021-03-19 16:46:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 004985dc1e33e2af3dc8031593005066 SHA-1: 616566c15652d5855c8c426ba597b9594528f357 SHA-256: 87f57eb89ceb46ac5cbf5df35333ca76c52e2ecf5afae87d141e7c7c080592ac
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically pointing to a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains references to 'Dr seuss books for sale' and 'wkhtmltopdf', suggesting a lure to a malicious website.

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
  • 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://leonvi.ru/aws?utm_term=dr+seuss+books+for+sale PDF link annotation
    • https://cdn.sqhk.co/fazituku/e9yXIgi/air_combat_racing_download.pdfIn PDF document text
    • http://xanimupa.22web.org/outside_magazine_contributor_guidelines.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379605/normal_5fed19d77b480.pdfIn PDF document text
    • https://cdn.sqhk.co/wodaximewule/fTGDieE/call_of_sparta_hack_2020.pdfIn PDF document text
    • http://jinobuzid.scienceontheweb.net/business_email_writing_exercises.pdfIn PDF document text
    • https://cdn.sqhk.co/daxegajok/pugfttR/black_men_s_haircuts_with_dreads.pdfIn PDF document text
    • https://cdn.sqhk.co/viwedanej/fhdRGCX/goal_arsenal_news_today_now_live.pdfIn PDF document text
    • http://subumobo.22web.org/business_process_automation.pdfIn PDF document text
    • http://jukejed.mypressonline.com/nutazunojuviki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461777/normal_6012950648664.pdfIn PDF document text
    • https://cdn.sqhk.co/benanejufa/OHpjjgg/notepad_compare_plugin_64_bit_dll.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
    • https://uploads.strikinglycdn.com/files/3e816f87-02a6-4328-a1b3-2b02b885d03b/ti_nspire_cx_charger_walmart.pdfIn PDF document text
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_f03eed4769c14e30ada19fe02261e0f1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fcbc4af-b47b-4511-9a0d-953e77a17bf3/33037222473.pdfIn PDF document text
    • http://zefixufedinokas.epizy.com/97936796225.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/760586fb-781b-4026-8c6f-3f2b2e918ce5/sidunakorano.pdfIn PDF document text
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_0e1d2c5ad80f4e11afae8f1768809ab1.pdf?index=trueIn PDF document text
    • http://pususarejopo.epizy.com/organic_compounds_chart_worksheet.pdfIn PDF document text
    • http://gakajitaju.atwebpages.com/45788881487.pdfIn PDF document text
    • http://bibalaluroxute.epizy.com/34583610710.pdfIn PDF document text
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_70f58ae444cc4b8883e79456101473bc.pdf?index=trueIn PDF document text
    • http://faxiruvud.myartsonline.com/14486440206.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8C 4612 bytes
SHA-256: f79acf7cac7bef7dd6d6e64dcc14da21b66bc819e35901b9045190c0fc34da8d
font_01_sfnt_off0000ff4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4E 11040 bytes
SHA-256: cef8330b83dc61d8026f2086abc3e61b89cf65acb1e435dc15bbec820b1b4c89
font_02_sfnt_off000124da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DA 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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