Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d0096c289280dd…

MALICIOUS

PDF

73.7 KB Created: 2021-03-23 21:48:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2342130cbb9997a711af1e66feee8752 SHA-1: de653e97d95bca109fa71ccf7fa4e4335c15404a SHA-256: d5d0096c289280dd5fa44e2167212158f4a4a2b90f0a2ff5d63e3459747a6ac8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are to SEO-optimized PDF hosting sites, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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
  • 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://druttle.ru/wix?keyword=old+study+hall
    • http://mobutadaxez.medianewsonline.com/building_estimation_and_costing.pdf
    • http://geleostone.online/10018442727bss7r.pdf
    • http://8bitbeardsco.com/kavonalidaxetagarokumatujhjwq9.pdf
    • http://electorat.org/igloo_ice_machine_troubleshooting9w5c3.pdf
    • http://topdouche.xyz/google_sheets_if_cell_contains_numberxp47y.pdf
    • http://viwafuxofiseko.getenjoyment.net/albinismo_2020.pdf
    • http://moxilekulina.getenjoyment.net/how_to_install_blue_by_adt_alarm_system.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/laginekux/timeturepevawum.pdf
    • https://s3.amazonaws.com/dozore/6318913553.pdf
    • https://s3.amazonaws.com/fuwenoxuzasila/third_conditional_grammar_and_exercises.pdf
    • http://movuzawizigevej.myartsonline.com/biodata_for_marriage_file.pdf
    • https://be9ca920-c372-4566-b00d-544f92814f3b.filesusr.com/ugd/f0c5a9_97445b1839814dc2a475f46f86873067.pdf?index=true
    • https://s3.amazonaws.com/bulalowisu/mubufinegoloputiziv.pdf
    • https://s3.amazonaws.com/mamibis/how_to_fix_a_broken_ink_cartridge.pdf
    • https://s3.amazonaws.com/gagagakigibapo/jenkins_pipeline_artifactory_artifact.pdf
    • https://d2faa26e-66ca-44cd-8f84-883624a71019.filesusr.com/ugd/dbbfd0_72635cf4fce14628b16fc43dbada172f.pdf?index=true
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_69cd3c743f90441d98adba42dd986174.pdf?index=true
    • https://s3.amazonaws.com/webipejonavuv/xeluvuz.pdf
    • https://s3.amazonaws.com/lazolu/java_architect_interview_questions_and_answers_download.pdf
    • https://s3.amazonaws.com/jazuravazaguz/rejerolekeden.pdf
    • https://s3.amazonaws.com/sogovekevi/acer_laptop_windows_10_price.pdf
    • https://s3.amazonaws.com/bupesejirijejus/52377184260.pdf
    • https://s3.amazonaws.com/patotale/zivewajefa.pdf
    • https://92fed17e-af34-466b-b3fe-38cd9ef27699.filesusr.com/ugd/192d58_5aecc7a3565d410fadeab53af77c6c55.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_off0000e4ba.bin
b06424a487e0eabc68833cde3f745799dede3e31fceffc5faf9acd7f241bd960		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BA 4948 bytes
font_01_sfnt_off0000f58f.bin
8de978d342126d81dafe2cfe85742e8aab25d20a42241da78249c557ffb9f38c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF58F 10568 bytes

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