Malicious PDF — malware analysis report

Static analysis result for SHA-256 956a13e7988da90a…

MALICIOUS

PDF

89.0 KB Created: 2021-03-24 13:04:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a05423d8703ecff2a7ab2659f93cfdc7 SHA-1: 5216b4655a8e3ccf315ec3560973b2ea0a833bb9 SHA-256: 956a13e7988da90a337b94f7c15554d6802bab73a30886468a26f68063006aa9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs that point to other PDF documents, suggesting a tactic for SEO manipulation or distributing further malicious content. The presence of multiple external links on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/123?utm_term=moviesda+2014+movies+free
    • https://cdn-cms.f-static.net/uploads/4419640/normal_60123d2b31632.pdf
    • https://cdn-cms.f-static.net/uploads/4446765/normal_604cd552b0bec.pdf
    • http://lulodexov.scienceontheweb.net/62861285068.pdf
    • https://cdn-cms.f-static.net/uploads/4374835/normal_6047a836de907.pdf
    • https://cdn-cms.f-static.net/uploads/4393511/normal_6045daadf236d.pdf
    • http://kumululurug.scienceontheweb.net/godovukazuwetagaxufajajel.pdf
    • http://zajiledafalam.getenjoyment.net/how_do_i_find_my_technicolor_router_password.pdf
    • http://wijofotezopadik.medianewsonline.com/how_to_add_if_yes_in_google_forms.pdf
    • http://lexamopelezun.mywebcommunity.org/ejercicios_para_aumento_de_masa_muscular.pdf
    • https://cdn-cms.f-static.net/uploads/4503533/normal_5fe86b9e39aae.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://8650d040-a33d-467d-a608-6706f181f11b.filesusr.com/ugd/61b8bf_f7aa1c9e91e04b8f87caa0be67ee0658.pdf?index=true
    • https://63995da9-74be-4895-8497-a4fa53c9845d.filesusr.com/ugd/788c84_7532abc29aa04a628ddcbfaa5a6e60af.pdf?index=true
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_9c21faa611b540848bc323c65e46c4a2.pdf?index=true
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_ce908f300c854abba5ff01c354063e8e.pdf?index=true
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_2d9563c01c63438da0153faedf19e462.pdf?index=true
    • http://mojozore.myartsonline.com/adobe_printer_install_windows_10.pdf
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_591467bf24e440a5afa2b41d9b78ba47.pdf?index=true
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_8e837dcd359a4e9684eb1cc1ac5e58eb.pdf?index=true
    • https://7a48fde5-f9d1-4ce4-84a2-8b156d245d18.filesusr.com/ugd/8127dd_f97c5ecbd7b6494a807e613d0ab27df2.pdf?index=true
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_e7082c00fc9149ba824440770d14c129.pdf?index=true
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_10390f3e3e584e9987795b484f7da6af.pdf?index=true
    • http://wipibefab.onlinewebshop.net/bitrix24_training.pdf
    • http://tevaluzax.atwebpages.com/74941110133.pdf
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_65a7b49717624199ac14822ccb0d8cdd.pdf?index=true
    • http://jefiferinazubim.atwebpages.com/jonebewedidewijugiwuni.pdf
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_387933c6766341fe8b1677f4d134a2e6.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa13.bin
218762e9d8db6032550b73726e5b8b570b1a0cd3cf6d569b3c498295a9971539		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA13 5100 bytes
font_01_sfnt_off00010b7c.bin
443da0f11dc6fa96a32d0ebb3c07cd3db970b3e5914336b73b8f0514271a8be8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7C 11592 bytes
font_02_sfnt_off000132e1.bin
c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132E1 16164 bytes
font_03_sfnt_off000147f6.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x147F6 4324 bytes

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