Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9bbc6922a422114…

MALICIOUS

PDF

177.5 KB Created: 2021-04-28 05:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 91bdde7a610a07aec20c8c1a5bdc2adb SHA-1: 5ede34014e67b6043bd365d442f52d94a151651b SHA-256: e9bbc6922a42211477d0b8928a5826c9fc05d58506e0400ae87e8d201f040de5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious content.

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://resalured.ru/strik?utm_term=why+did+haiti+want+independence PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445737/normal_6003638577192.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412768/normal_5fdab5134edc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408352/normal_601d007b45603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412570/normal_600f11c6b6afc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406777/normal_6006b7f93699f.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/origen_del_modo_de_produccion_socialista.pdfIn PDF document text
    • http://kiritisivasol.mywebcommunity.org/ejercicios_para_el_abdomen.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497666/normal_5ff0362c8c4af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421627/normal_60549e9793f8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409258/normal_60169294533eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462075/normal_600e92ca25175.pdfIn PDF document text
    • http://zimuzezu.22web.org/nowijopepuvisoladi.pdfIn PDF document text
    • http://torixewiser.medianewsonline.com/signs_a_guy_is_interested_in_you_body_language.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c20083f0-e11c-41c5-a6f8-e96ba6fff3a2/durijupen.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/viwad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc451ef2-5546-4030-90df-353125a7bff2/libro_millonario_instantaneo.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/girl_bestie_status.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b56beb84-d7de-4fb0-8ee9-d9ddd0a92ee2/69495365784.pdfIn PDF document text
    • http://fibubaxuvuvixik.epizy.com/34129666475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/188c862a-e50f-4329-b9c8-11c0cdba6dbb/zedujixononememuwawiza.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/71400515195.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_off0002791c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2791C 5060 bytes
SHA-256: da671c6e0d35da1f9461b937683c8c9ee5c37e93f988118050920f698d097514
font_01_sfnt_off00028a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28A79 13668 bytes
SHA-256: 846a49675264fbc447d91e09d4f06f6cb25a745ddf04c73922b73c7450a640f4

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