Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb21eb7faa8c3ef1…

MALICIOUS

PDF

81.5 KB Created: 2021-04-07 05:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6416611112987f108d30a16b09fec2e8 SHA-1: 185e9892f5c5eac5c802933a33948eb3a240c103 SHA-256: eb21eb7faa8c3ef1b97375de14844be71e9ab869faf81b16c34a314eb97639d3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the nature of the PDF and the numerous external URLs point towards an attack pattern involving directing users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=9001+iso+2015+management+review+example
    • http://fuxanujibiz.mygamesonline.org/virulence_factors_of_streptococcus_pneumoniae.pdf
    • https://cdn.sqhk.co/kigaratak/c1gdZjg/angular_formgroup_remove_controls.pdf
    • http://fidofawi.medianewsonline.com/76037540748.pdf
    • http://femuxeririta.mygamesonline.org/all_aarti_sangrah_in_marathi.pdf
    • http://gazizelasama.getenjoyment.net/autocad_2020_installation_guide.pdf
    • http://rafupofamurawaf.mygamesonline.org/covalent_bond_practice_worksheet_answer_key.pdf
    • https://cdn.sqhk.co/dilizilozok/rZFibTA/73903618203.pdf
    • http://jibakerutev.mypressonline.com/84089856587.pdf
    • http://vowuzemiru.medianewsonline.com/suleguvepodulaxagafas.pdf
    • https://zusifupovososix.weebly.com/uploads/1/3/2/6/132680896/7360020.pdf
    • https://cdn.sqhk.co/letarezetap/PibLjcP/clothes_worksheets_clipart.pdf
    • http://motozed.scienceontheweb.net/folemovajogubojowuruzal.pdf
    • https://cdn.sqhk.co/gisefezuzif/6jf0CMk/14491291889.pdf
    • http://bivoliku.mywebcommunity.org/hunter_thompson_kentucky_derby.pdf
    • https://cdn.sqhk.co/faxiwapa/lVhb7gb/xatorozo.pdf
    • http://vevufilusik.scienceontheweb.net/biomechanics_of_sport_and_exercise_free.pdf
    • https://cdn.sqhk.co/vakolitakap/Ticjdjf/asana_client_management.pdf
    • http://lugodapamaj.mygamesonline.org/spring_framework_notes.pdf
    • https://dizilezojo.weebly.com/uploads/1/3/4/2/134234798/69a26177c7.pdf
    • https://cdn.sqhk.co/rasepotobami/Gjfihhc/dogfighter_ww2_ps4_free.pdf
    • https://cdn.sqhk.co/nixivezez/ijbgg4d/60030444550.pdf
    • http://xodaxedepapopox.mygamesonline.org/skill_check_vs_ability_check.pdf
    • http://ninuwekevap.scienceontheweb.net/alan_moorehead_gallipoli.pdf
    • https://cdn.sqhk.co/rupomotiz/hWUjahd/boomerang_video_editing.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vilumepidiwego.myartsonline.com/80707946358.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff96.bin
b3eaca9c632ca2e1a2e28d0270cb92b534add44f1a19c018c0ff09524e754626		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF96 5872 bytes
font_01_sfnt_off00011396.bin
f7aeccfe6ff78c327414f47611d5e13eccdc659feb7eaa5d363816821f128b1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11396 10932 bytes

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