Malicious PDF — malware analysis report

Static analysis result for SHA-256 b12b1ab15aecae50…

MALICIOUS

PDF

72.2 KB Created: 2021-03-26 08:54:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9b763d75b8f7d21c0bbecfd252411a5f SHA-1: c620d76b59afee5fa79ca92944455c0d9be2cbea SHA-256: b12b1ab15aecae5050ea336f26b5235c4bf41f35f959fb670d6708277f494b3d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains a lure related to pairing a TP-Link device, which is likely a pretext for directing users to a malicious URL.

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://bologen.ru/strik?utm_term=how+to+pair+tp+link+tl+wa850re PDF link annotation
    • https://cdn.sqhk.co/riwutosax/hegpghd/77690569973.pdfIn PDF document text
    • http://trellos.fun/xeramopowuzun2v2zu.pdfIn PDF document text
    • https://cdn.sqhk.co/tobijoge/hejdhdM/xbox_series_x_controller_pc.pdfIn PDF document text
    • http://boost-shop.xyz/madezerufigc2zem.pdfIn PDF document text
    • http://reduslimer.website/the_clan_of_one_breasted_women_summatiymc.pdfIn PDF document text
    • https://cdn.sqhk.co/lenufetimop/pgfgjgc/coplanar_waveguide_design_equations.pdfIn PDF document text
    • http://vumoramoguko.22web.org/consumer_reports_digital_subscription_discount_2019.pdfIn PDF document text
    • http://helplnstagramcontact6088758.com/zojirushi_rice_cooker_timer_not_workingf8w25.pdfIn PDF document text
    • https://cdn.sqhk.co/pifizumux/a8pKZ9X/electric_train_displays_near_me.pdfIn PDF document text
    • http://clubstore.info/14392354912iart3.pdfIn PDF document text
    • https://cdn.sqhk.co/pemoxeriko/jjAiecx/galaxy_fort_airfight_star_assaulted.pdfIn PDF document text
    • http://tplinkrepeater.netT��iIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/37b2ca08-7d2e-4aae-a012-41ef20bbbe6c/4805966967.pdfIn PDF document text
    • http://bozusofofutuv.rf.gd/diccionario_biblico_cristiano_reina_valera_1960.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a9c34ef-7e86-4a3e-9fe0-e514cf68cb7a/what_is_the_performance_appraisal_process.pdfIn PDF document text
    • http://relutuduweda.epizy.com/activity_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f30211e5-16ad-40dd-baa2-91f3011849bd/what_to_do_when_thermostat_is_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bad7439-68bd-4402-b728-81168ce47d1e/40574311261.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f924627-d1d5-4aca-b9ab-05381dd6b0ee/cheapest_data_science_degree_online.pdfIn PDF document text
    • http://tatasuvuputo.epizy.com/32411439332.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63f52c1c-d6c7-41b5-bacc-d5cf7aa88439/38243815251.pdfIn PDF document text
    • http://xuwizigev.rf.gd/number_system_and_digital_circuits_objective_questions_and_answers.pdfIn PDF document text
    • http://pupojabusito.rf.gd/ribaxibejida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e4d2f24-974e-461f-9d11-b651dc39ca92/nombres_de_jess_en_la_biblia_y_su_significado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d76af170-c9ce-4e75-bd57-d43bad18f980/24492113283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be5807ea-fef8-41f6-9196-40af5256f6a3/before_you_accuse_me_ccr_guitar_tab.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_off0000d210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD210 5212 bytes
SHA-256: 38beed959c8bf41e09147997debc38134a46c145f0cf381c08676dc74dcb1431
font_01_sfnt_off0000e3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EA 18028 bytes
SHA-256: 568dc7716b41e4fa690dd80f89d6d1f921a8f9294e5d8103ecbe081ca84cf96c