Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab52fef16d44ea7…

MALICIOUS

PDF

79.8 KB Created: 2021-06-07 02:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 381463f4b7815233a157d24e9946c6ad SHA-1: f681956b884b8d48dc54493c5ee72c7622a35193 SHA-256: 4ab52fef16d44ea7bd679fc23ec28e222f6efe5631acbb3467d2246c3452a5c8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting services and utilize UTM parameters, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external 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://infrive.ru/pbw?utm_term=between+the+lines+nikki+grimes+pdf PDF link annotation
    • https://gatuxarujesij.weebly.com/uploads/1/3/5/2/135296766/7256214.pdfIn PDF document text
    • https://xukunuwemixul.weebly.com/uploads/1/3/1/3/131384589/jivizi.pdfIn PDF document text
    • https://rukusipaxup.weebly.com/uploads/1/3/2/6/132683367/8568640.pdfIn PDF document text
    • https://wevepoguf.weebly.com/uploads/1/3/4/7/134717949/0c39d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vakerul.pbworks.com/f/beyblade_burst_evolution_in_tamil_dubbed_download.pdfIn PDF document text
    • http://mumubib.pbworks.com/w/file/fetch/144412116/how_to_identify_herpes_zoster.pdfIn PDF document text
    • http://naxoxututal.pbworks.com/w/file/fetch/144756726/gonafogibeweburulube.pdfIn PDF document text
    • http://kepigiwup.pbworks.com/f/lubow.pdfIn PDF document text
    • http://pupowivala.pbworks.com/w/file/fetch/144426813/62458200751.pdfIn PDF document text
    • http://pugaxigodaka.pbworks.com/f/summary_of_employment_equity_act_55_of_1998.pdfIn PDF document text
    • http://zigunef.pbworks.com/w/file/fetch/144750777/exercicios_de_movimento_circular_uniformemente_variado.pdfIn PDF document text
    • http://lomubel.pbworks.com/w/file/fetch/144496917/basics_of_keyboard_theory_level_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3333c84a-c423-4670-a6fa-e3d8cc165a99/cuanto_mide_un_metro_cubico_de_concreto.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/f/qu_significa_soar_con_que_se_te_caen_los_dientes.pdfIn PDF document text
    • http://pebakix.pbworks.com/w/file/fetch/144730758/86581417265.pdfIn PDF document text
    • http://gipomebepate.pbworks.com/w/file/fetch/144582132/97190205778.pdfIn PDF document text
    • http://zafasuvolo.pbworks.com/f/wong-baker_pain_rating_scale_faces.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aaa4a33-93ad-492d-9923-41959f0e3069/57612140721.pdfIn PDF document text
    • http://veputuvus.pbworks.com/w/file/fetch/144757764/kivitisadevejizax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c28672fa-2938-443c-ae50-aec1654ae07a/how_to_use_ti-89_titanium_calculator_for_finance.pdfIn PDF document text
    • http://zorisomofi.pbworks.com/w/file/fetch/144710523/pivefudajo.pdfIn PDF document text
    • http://sozakuvepar.pbworks.com/f/what_is_the_purpose_of_jurisprudence_and_legal_theory.pdfIn PDF document text
    • http://paditoxef.pbworks.com/f/heat_and_mass_transfer_data_book_9th_edition_free_download.pdfIn PDF document text
    • http://fevawigo.pbworks.com/f/winabin.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_off0000f655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF655 5448 bytes
SHA-256: 30f8408b063869d6ea2256aa799748daab255e7c9597783d6c93f26f45c2a1cc
font_01_sfnt_off000108ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CE 12016 bytes
SHA-256: 0f54ba4b93731efa4ae1569edf2f0837d9fa6662b6ca8b1d1e799634949dd557