Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed81acb720bf40a9…

MALICIOUS

PDF

75.7 KB Created: 2021-03-30 03:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba3dc879b822a62b13939ed065873a28 SHA-1: 7d87bdf4438a19d8ddd583fb22bd1e6b6e76a72e SHA-256: ed81acb720bf40a905864a05132052e920510e25ece3ed4a26b97cb9f3044940
126 Risk Score

Malware Insights

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

The PDF contains a high number of embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/aws?utm_term=xerox+workcentre+7855i+toner+cartridges
    • https://cdn.sqhk.co/jabosuve/Jjib3ig/fuwonasevurowedizenakaz.pdf
    • http://itawegan.fun/what_is_terri_irwins_net_worthl8h9l.pdf
    • http://nenonazuf.scienceontheweb.net/beregadufujuwazedu.pdf
    • http://budofibo.mygamesonline.org/tatuvawi.pdf
    • http://about-central.com/75313527200lulb7.pdf
    • http://wepijafiguwenan.mywebcommunity.org/ejercicios_resueltos_arboles_de_decision.pdf
    • http://wide-do.top/cfa_level_1_mock_exam_2018_downloadhjagr.pdf
    • https://cdn.sqhk.co/muwizavo/ngigheb/54064536106.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tesasubawalozan/wozem.pdf
    • https://s3.amazonaws.com/gavobawum/87362583282.pdf
    • http://bojepudadadax.atwebpages.com/sosyal_bilgiler_6._snf_1._nite_test.pdf
    • https://8772a198-af03-49ef-8724-5feb7546cb8a.filesusr.com/ugd/436f04_73086d7bba3945e8b47d7fc4586a2d3b.pdf?index=true
    • http://lofunadex.myartsonline.com/learn_python_the_hard_way_4th_edition_download.pdf
    • https://s3.amazonaws.com/somamere/xisaguxoramebumoworux.pdf
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_57fadf68bf2b4434b02fbd937a468e80.pdf?index=true
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_1452d765943a465dacdc516fa7146d6e.pdf?index=true
    • https://0b609444-e5a2-4a7e-9779-a3c6bae51a53.filesusr.com/ugd/529dbf_82d22ee863314ac4b7f0af08ce257d3d.pdf?index=true
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_57fbb37387cf4e3ebaf4f365dc2e00ba.pdf?index=true
    • 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_off0000e6e1.bin
a7b60d6cd64149cf43801830e62296b84b9c1fd7f9ff01e9c0ef2b6a1687272f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E1 5676 bytes
font_01_sfnt_off0000fa64.bin
7f68798cc8317d0921bf955ccf9fe64b8bc02a74b12f01db5c1ada8781399688		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA64 11380 bytes

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