Malicious PDF — malware analysis report

Static analysis result for SHA-256 2995c8b7819bb225…

MALICIOUS

PDF

78.8 KB Created: 2021-03-18 15:11:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2a0794ff409ace5d4043dc41d7ca8c3 SHA-1: 93245b2f9da90f6ad353ab4e34912cbd7de012a3 SHA-256: 2995c8b7819bb225dcff9a6eec5374686d056306c6aa480db65892df6000f4a7
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by multiple heuristics, including ML and ClamAV, as malicious and phishing-related. The document body, though heavily obfuscated, suggests a lure related to 'activities sheets for 2 year olds' which directs users to external URLs. The presence of numerous links, many on disposable hosting, indicates a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/123?utm_term=activities+sheets+for+2+year+olds
    • https://static.s123-cdn-static.com/uploads/4485930/normal_5fe53602bbb20.pdf
    • https://cdn.sqhk.co/gotoruzud/igiho7m/telecharger_tubemate_apk_ancienne_version.pdf
    • https://cdn-cms.f-static.net/uploads/4465257/normal_604d1e00c0b70.pdf
    • https://static.s123-cdn-static.com/uploads/4467577/normal_5fc71505a4e34.pdf
    • http://luxasireku.sportsontheweb.net/types_of_aircrafts.pdf
    • http://devuweza.scienceontheweb.net/xuvefizoreralejatodujamex.pdf
    • http://pakirekugep.scienceontheweb.net/99373889582.pdf
    • http://movawizaxaxato.mywebcommunity.org/tabela_de_consumo_de_energia_eletrica_de_eletrodomesticos.pdf
    • https://cdn.sqhk.co/kivipemo/CBzRJjj/4831920716.pdf
    • http://wivikaxebox.medianewsonline.com/gogotojudisodakum.pdf
    • http://wonozudobitisog.scienceontheweb.net/top_rated_cordless_phone_for_hearing_impaired.pdf
    • https://cdn.sqhk.co/sebixodof/kExggAa/61858530285.pdf
    • http://saxobupazes.sportsontheweb.net/what_is_the_meaning_of_the_word_dialectical_materialism.pdf
    • https://cdn-cms.f-static.net/uploads/4460457/normal_6034df36e510f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wiwosotu.myartsonline.com/xibalimirumatuzaka.pdf
    • https://uploads.strikinglycdn.com/files/2938362b-bbd7-4e08-a18f-65becca1fe73/average_salary_for_phd_in_molecular_biology.pdf
    • http://samajusinifako.atwebpages.com/cheat_codes_simcity_4_deluxe_edition_pc.pdf
    • https://uploads.strikinglycdn.com/files/902f17b2-fa49-407f-a005-dc47eca260a5/2012_ap_lang_rhetorical_analysis_sample.pdf
    • https://s3.amazonaws.com/zozuxukoxo/the_republic_for_which_it_stands_epub.pdf
    • https://s3.amazonaws.com/bededuxotulapil/jojutaposijulolatarazekaz.pdf
    • https://s3.amazonaws.com/dikomavomem/kisurorubazewa.pdf
    • https://s3.amazonaws.com/kovezodepugov/fubim.pdf
    • http://pojozija.onlinewebshop.net/24771919115.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5e2.bin
9d5333f3a84b5a71621db6eec4049986641b1905631a6bde775c5b915190fc8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E2 5392 bytes
font_01_sfnt_off00010843.bin
2f3f17174f7a61dd5522a39be3655b0834912c19bef3dd9772c41c2bb2489168		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10843 10960 bytes

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