Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26ea5e508d192ef…

MALICIOUS

PDF

74.9 KB Created: 2021-03-24 16:33:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 6c423c5901aa5a40c000abfd17be5314 SHA-1: e92ecb43fc6947b2959d3cdce39a88ac9ded09fa SHA-256: b26ea5e508d192ef45bab5be5c7b544b5d215f97e3ecacd22d51ea96bebafd98
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a large number of embedded URLs, with one prominent URL pointing to 'resalured.ru', suggesting a link farm or redirection service used to host malicious content. The document body is heavily obfuscated, but the presence of numerous links and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest the primary purpose is to direct users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/aws?utm_term=cuantos+metros+cuadrados+tiene+un+estadio PDF link annotation
    • http://nejupike.mygamesonline.org/fowalozowakimot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483602/normal_603d52e77ac61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444358/normal_605362de633c0.pdfIn PDF document text
    • http://madawuboso.sportsontheweb.net/61370968557.pdfIn PDF document text
    • http://lamejix.scienceontheweb.net/personajes_principales_de_la_celestina_y_su_descripcion.pdfIn PDF document text
    • http://fofolep.mywebcommunity.org/mini_football_pitch_dimensions_in_metres.pdfIn PDF document text
    • http://bukapim.mywebcommunity.org/48939939957.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452608/normal_602e447474c77.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kegigija.atwebpages.com/what_does_alchemy_mean.pdfIn PDF document text
    • http://wojibikifi.myartsonline.com/25938974043.pdfIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_e0a33cb80f2b4f79870005dfc64d4943.pdf?index=trueIn PDF document text
    • http://sefowolo.atwebpages.com/61700063801.pdfIn PDF document text
    • https://981168d4-05fc-44b6-871d-73371d7e8cf1.filesusr.com/ugd/87d215_be43db4fe4954404952836bf6f802a09.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d16ce8f2-93d0-447a-abf3-c65b61ff33a6/watozolasoluzix.pdfIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_47cc29f3d72e4c23b48355e9740c3d04.pdf?index=trueIn PDF document text
    • http://bodudenijijeb.onlinewebshop.net/manual_de_procedimientos_de_auditoria_interna.pdfIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_17eb42b5806a442aa095a26e278dd9e2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/00d4541e-11eb-46be-84ea-040ccf7807c9/romeo_and_juliet_1996_full_movie_dailymotion.pdfIn PDF document text
    • http://zodofujeki.atwebpages.com/708637110.pdfIn PDF document text
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_3251823b80c04e2c9cb80470cb5db689.pdf?index=trueIn 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_off0000e363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE363 4956 bytes
SHA-256: 7738b038553ca74661ba62f4f631a1567d1bf9e9ae5c255953c7b87014e60bad
font_01_sfnt_off0000f420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF420 12396 bytes
SHA-256: f630b29497e61ce17781a0d85f566cdc29041f9020c777c73cb91d2a38fcf021

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