Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a80f8b19b7eb70…

MALICIOUS

PDF

87.1 KB Created: 2021-03-25 06:16:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2eecfeec234d0f9287125e12a7775a44 SHA-1: 85c7fa30518c4fda26487845520585fc4b6cd616 SHA-256: c9a80f8b19b7eb70ab8f74901cdd043026298d59468c87c04ac373eff4ce4d86
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 ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of these links, combined with the PDF structure, points towards an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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-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://golowaki.ru/aws?utm_term=que+es+un+bosquejo+biblico
    • https://togurekeve.weebly.com/uploads/1/3/4/0/134040335/sebebafoxajazon.pdf
    • http://wekanisa.scienceontheweb.net/what_is_sprint_in_agile_methodology.pdf
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/satebeliw.pdf
    • http://selozufuwadapuw.66ghz.com/el_abc_del_anarquismo.pdf
    • https://wazaxilam.weebly.com/uploads/1/3/4/7/134726650/saxalar.pdf
    • https://kitigenuripoduj.weebly.com/uploads/1/3/1/0/131070171/wusiz_radagodonev_wefage_doradametawe.pdf
    • http://tegor.xyz/61896376977763gz.pdf
    • http://bumasujofoj.getenjoyment.net/solid_oak_study_desk.pdf
    • http://rerubin.space/4695865251922iil.pdf
    • http://rezanufeku.mygamesonline.org/ayushman_bharat_scheme_2020.pdf
    • http://vir-tus.com/sokivezefotefuv7rvbq.pdf
    • http://jukojadijomefar.medianewsonline.com/how_to_turn_on_proform_2000_treadmill.pdf
    • https://madajeguruxe.weebly.com/uploads/1/3/4/3/134348767/7836120.pdf
    • http://wonozudobitisog.scienceontheweb.net/bodiveki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://lixugafepujijoj.onlinewebshop.net/67402030906.pdf
    • http://vujijemu.atwebpages.com/8184203204.pdf
    • http://gebukoxidu.rf.gd/29172088871.pdf
    • http://dinagujepapure.rf.gd/latex_template_for_cover_letter.pdf
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_1fbab4d769be43c199461b743f71f005.pdf?index=true
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_aa480ec01c9f4ba3bb35716113f5cb48.pdf?index=true
    • http://zorijefugixor.atwebpages.com/videtupafexejil.pdf
    • https://78bdfa25-736e-4945-a764-db21511aacb9.filesusr.com/ugd/9bd82e_303698b1b32e466ab5dae00d419b14fc.pdf?index=true
    • http://natikajurijufuk.rf.gd/92340615931.pdf
    • http://vudolazer.rf.gd/converse_plataforma_negras_altas_cuero.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010838.bin
a42994950e75635b53bb3d61b9489ca6568a49c29ae400421b5a8833c05fbd63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10838 4692 bytes
font_01_sfnt_off00011838.bin
a13d161c5e6631daccf6d40696eaf399d0caf53850f4088ae484e23044b4c188		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11838 12500 bytes
font_02_sfnt_off000140c8.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x140C8 4324 bytes

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