Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81e4ee0857e37f2…

MALICIOUS

PDF

75.1 KB Created: 2021-03-25 08:57:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4094960edf465bad1e0f9ca7d622c316 SHA-1: 260e002fb1037bb4cbc95093efb80d70a10e423c SHA-256: b81e4ee0857e37f295f23c1c54909bec70983c773b7dc3c0afa49e6f1c502009
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically masquerading as an audiobook download. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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://xajibur.ru/strik?utm_term=the+things+they+carried+audiobook+mp3+download PDF link annotation
    • https://wuwesojelure.weebly.com/uploads/1/3/5/9/135973580/bupowutux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481841/normal_6004fc45b0790.pdfIn PDF document text
    • http://robinmani.site/terewetotorolazezazv03.pdfIn PDF document text
    • http://rodsfish.club/zimuzaluorh4.pdfIn PDF document text
    • http://vbruti.site/hungry_shark_evolution_glitch_androidw7phx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459328/normal_604eee489ca2f.pdfIn PDF document text
    • http://ellmax-site.xyz/exalted_3e_dragon_blooded_character_sheetkbe7b.pdfIn PDF document text
    • https://novomuzedideb.weebly.com/uploads/1/3/1/4/131406537/miwofeg.pdfIn PDF document text
    • https://noxetetejiv.weebly.com/uploads/1/3/4/3/134391164/2507319.pdfIn PDF document text
    • http://crystal-light33.ru/how_do_i_change_my_veinminer_settingsba5nj.pdfIn PDF document text
    • https://fimuvuxufubewi.weebly.com/uploads/1/3/4/4/134442536/zisosofisumoxez-zitowelon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426087/normal_60469b3be4dea.pdfIn PDF document text
    • https://kupugaxome.weebly.com/uploads/1/3/0/9/130969415/ramuj-digonutulane-daputom.pdfIn PDF document text
    • https://dodonixufaf.weebly.com/uploads/1/3/1/4/131453867/voxolirunuseva.pdfIn PDF document text
    • http://menbp.online/how_to_reset_my_overhead_garage_door_opener3jges.pdfIn PDF document text
    • https://nupanirosum.weebly.com/uploads/1/3/4/8/134858368/lamiwibigo.pdfIn PDF document text
    • http://tryporte.xyz/fluke_dtx-1800_cable_analyzer_user_manualw8iee.pdfIn PDF document text
    • https://wezogefizu.weebly.com/uploads/1/3/4/2/134234847/wirijetumawejejit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388165/normal_603eb78c144e6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bibekuxamawijoz.epizy.com/mixed_present_tenses_exercises_intermediate.pdfIn PDF document text
    • http://gonurorirezode.epizy.com/85096896909.pdfIn PDF document text
    • http://finubovuputok.epizy.com/44609693793.pdfIn PDF document text
    • http://wavedada.epizy.com/asian_forest_scorpion_information.pdfIn PDF document text
    • http://bekepijamewevo.epizy.com/dragon_ball_z_androids_saga_episodes.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AC 5996 bytes
SHA-256: d2e4bd43cd04699a59903ef2f4f8c3e36543889eac3c035d17ef02e72f09a3ee
font_01_sfnt_off0000fa08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA08 10788 bytes
SHA-256: 6b18a76a7ebff3c3ce899779abf9890d8e21d5b2929f706dcce105c8b692376c

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