Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e6d2f5293b8b0b…

MALICIOUS

PDF

82.1 KB Created: 2021-02-27 16:48:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ad9030b9bb3dd65291d3169d8c66bef5 SHA-1: acc4274267caf5a337d89839215eaa08319b4e6e SHA-256: f6e6d2f5293b8b0be7c4e21a40f8747348d8ec09e9b3798f05eba57920fa4d69
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious and phishing-related. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'figurative devices', likely to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/123?utm_term=what+is+a+figurative+device PDF link annotation
    • http://tuderoba.getenjoyment.net/69490678020.pdfIn PDF document text
    • http://collegegraduatecentraldating.com/74974513851jcaiz.pdfIn PDF document text
    • http://air-calm2.club/80576669896cyl7j.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/plot_diagram_for_the_necklace.pdfIn PDF document text
    • http://confirmationhelpcenter.com/ear_doctor_brooklyn_heightsl1raz.pdfIn PDF document text
    • http://therarbooks.com/lagu_beruntungnya_aku_memilikimu1dkx5.pdfIn PDF document text
    • http://italylife.pro/dusk_till_dawn_piano_karaokezod7n.pdfIn PDF document text
    • http://complerbnp.com/cassandra_the_definitive_guide_3rd_editionth3tq.pdfIn PDF document text
    • https://cdn.sqhk.co/kelanadu/6vS4akb/used_car_sales_manager_jobs_near_me.pdfIn PDF document text
    • https://wamogipoko.weebly.com/uploads/1/3/0/7/130739383/wababigifozupupe.pdfIn PDF document text
    • http://sibatike.getenjoyment.net/dc_training_plan.pdfIn PDF document text
    • http://shoppingyxplus.xyz/accounts_payable_aging_report_quickbooksbm9vz.pdfIn PDF document text
    • http://igcopyrightverify.com/gumukuw4oj4v.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://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_off0000f78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78C 4992 bytes
SHA-256: 2635cf46291e5937b7e2f1815f86fd46eb6ea2232df983f3f77c8db53c5db173
font_01_sfnt_off000108aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AA 10768 bytes
SHA-256: dcf0ea53b3fb950da5a26a044f42eca6d98d9485092c876b5395a1f73ddf2e79
font_02_sfnt_off00012d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8A 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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