Malicious PDF — malware analysis report

Static analysis result for SHA-256 4399b5539647aced…

MALICIOUS

PDF

86.4 KB Created: 2021-04-04 04:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2a509965ed2bb818eb3088f3a560036 SHA-1: dc56a660f16a500be73b857ea4b21f57c964740d SHA-256: 4399b5539647aced8e14286697980b685257e5a27b83ea2cac658682442f22a9
156 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating a link farm and an embedded URI pointing to a suspicious domain, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/strik?utm_term=literary+devices+in+romeo+and+juliet+act+4+scene+1
    • https://cdn.sqhk.co/terasovo/hRiTOgb/popeyes_biscuit_meme_end_it_all.pdf
    • http://bottlechainworld.com/plan_y_programas_de_estudio_2011_quinto_grado_matematicasau155.pdf
    • http://vorakumezaxof.mygamesonline.org/tratamiento_de_la_anemia_en_pediatria.pdf
    • http://azalea.store/spalding_basketball_hoop_assembly_manualv9fl8.pdf
    • http://nuloriwilorij.scienceontheweb.net/chemical_kinetics_and_dynamics_steinfeld_solutions.pdf
    • https://cdn.sqhk.co/kepozote/igeGge6/muwanov.pdf
    • http://nebofimanigi.sportsontheweb.net/how_to_control_panasonic_tv_with_iphone.pdf
    • https://cdn.sqhk.co/pajokiman/gTgeid6/tamil_mp3_music_free_download_for_mobile.pdf
    • https://cdn.sqhk.co/fololekumi/fvifghs/sudupubuwobawudefili.pdf
    • https://cdn.sqhk.co/letaziseb/icjjibu/free_qr_scanner_app_for_iphone.pdf
    • http://form-lnstagramcopyrightservices.com/how_many_watts_does_a_cobra_29_put_outni9u9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a7ed8af5-5e4a-4eaf-98d7-51655494ca15.filesusr.com/ugd/b5c45a_97eeea9ac45d40588eb91650119d4bde.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0578e4f6-dff8-44be-9742-19b477bbf3f0/yard_machines_21_179cc_single-stage_snow_blower_with_electric_start_manual.pdf
    • https://uploads.strikinglycdn.com/files/c8c80caa-9332-48a0-8ce9-d51ca22ff3b8/the_cancer_journals_audre_lorde.pdf
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_1c7cfa125130434aaf2dd60a1e8a280d.pdf?index=true
    • https://f2fffe36-c7b4-4b88-9608-518dc6c14750.filesusr.com/ugd/950b2a_054c4d1975f042feb16ae9137c96aad9.pdf?index=true
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_18e0f93cdcc540418fd19a4884b69039.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_off00011613.bin
57cae528088baa44e64b9e4895c435ad666ba819cc1fc8ea0d8f4ed497672175		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11613 5404 bytes
font_01_sfnt_off0001287c.bin
3ebe01bd7a4ba6b75c3cb8c7d671a4115c791b641cc3d0f1d7fae785a24558ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1287C 10492 bytes

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