Malicious PDF — malware analysis report

Static analysis result for SHA-256 21299dba730f83fb…

MALICIOUS

PDF

78.2 KB Created: 2021-03-01 17:17:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7d71997b4c38e95d8d6a07f6ac214a32 SHA-1: f08bee8c31955dfa22f184729b870a08d36991cf SHA-256: 21299dba730f83fbc909abd51d7f78fcff66659e42c781994e3cab4021b95300
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains a large number of embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or malware distribution attempt. The presence of external URIs and the overall structure strongly indicate an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=lg+bp350+review PDF link annotation
    • https://cdn.sqhk.co/terupilenu/h1Iieic/jukude.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/40Mgg0u/stadium_ludogorets_arena.pdfIn PDF document text
    • http://jiteruruw.sportsontheweb.net/programa_de_estudios_2011_secundaria_matematicas_primer_grado.pdfIn PDF document text
    • http://helplnstagramcontact6088757.com/steven_skienas_the_algorithm_design_manual0urjd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384316/normal_600e32c573aca.pdfIn PDF document text
    • http://kapovulup.mywebcommunity.org/12169645284.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/pusaxakowasotosijujupaxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446642/normal_6024f0f16191e.pdfIn PDF document text
    • http://fakts.design/how_to_write_an_introduction_on_a_case_studybp6yv.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/rubibudujakuwujepife.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403143/normal_5fe7d264dbdaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386086/normal_603af51f285b7.pdfIn PDF document text
    • https://cdn.sqhk.co/digipexula/ccfwAps/53491746128.pdfIn PDF document text
    • http://tortomsk.ru/barrons_sat_subject_test_math_level_2_latest_editionp65xa.pdfIn PDF document text
    • http://mujudesuxiropa.sportsontheweb.net/blackberry_classic_non-camera_black_16gb_verizon_wireless.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/jeoge51/jewish_history_month_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gevejonitu.onlinewebshop.net/what_does_it_mean_if_your_roku_remote_stops_working.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/can_quicken_2015_run_on_windows_10.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_off0000f3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FC 5228 bytes
SHA-256: 925fa782a3eac82d3eb8d0875274589c16db26fa668333ad067443f45845f9f9
font_01_sfnt_off000105fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FC 11228 bytes
SHA-256: 983f2348ef648a765acaba001b48425b54ec1ebdbd41581ec5f85d75a17174f7

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