Malicious PDF — malware analysis report

Static analysis result for SHA-256 26feb510c940eb82…

MALICIOUS

PDF

76.8 KB Created: 2021-03-24 00:11:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: bf4506d4ca7b9343c785ebfd319addf7 SHA-1: fefca1552b46b35b429ce10c4478ce0beb33e429 SHA-256: 26feb510c940eb82d93f35f224c38e317d315930a0f40a0f5d60550d466ac43c
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure strongly suggest an attempt to deliver a secondary payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/wix?keyword=hw+daily+schedule PDF link annotation
    • http://golden-bridge.pro/2507548589559ucy.pdfIn PDF document text
    • http://fajamad.mypressonline.com/chave_do_windows_8.1_single_language_32_bits.pdfIn PDF document text
    • http://circus.market/samsung_hw-f450_subwoofer_wont_connect6liad.pdfIn PDF document text
    • http://bugarul.22web.org/why_is_it_important_to_feel_your_feelings.pdfIn PDF document text
    • http://bufibinokurun.scienceontheweb.net/96757681286.pdfIn PDF document text
    • http://supernefritroller.xyz/how_to_make_fake_bookshelvesudbnz.pdfIn PDF document text
    • http://prizinsta365.site/60337884767ezdd8.pdfIn PDF document text
    • http://finipupote.mywebcommunity.org/recipe_costing_formula.pdfIn PDF document text
    • http://bizowokare.getenjoyment.net/74932506677.pdfIn PDF document text
    • http://nuxutezupinel.22web.org/carotid_sinus_massage_how_to_perform.pdfIn PDF document text
    • http://zoluwofemofuper.sportsontheweb.net/tovokiwu.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/what_are_the_4_types_of_qualitative_research_design.pdfIn PDF document text
    • http://sisogelodaze.medianewsonline.com/liberalismo_en_tiempos_de_colera.pdfIn PDF document text
    • http://beautysss.site/why_doesnt_my_apple_tv_remote_volume_workziw3t.pdfIn PDF document text
    • http://kaxiwemusemoj.mypressonline.com/how_to_play_power_games_at_work.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/american_red_cross_first_aid_cpr_aed.pdfIn PDF document text
    • http://datidogebe.epizy.com/79268330044.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19dadaf6-0d37-40f6-b372-b8fec8d35f9a/can_animals_survive_without_air.pdfIn PDF document text
    • http://gifidabula.atwebpages.com/loworufuvevoziwobidenuz.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/wazefofob.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/juvamox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3890b18f-a51a-420d-a05d-4299cc1c03d5/lupasora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afc18d0a-e29f-4f1d-97e0-c6fd18771ef0/46012547840.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42a4c892-7c95-4e36-8581-b354e7eb982c/el_futbol_a_sol_y_sombra_resumen.pdfIn PDF document text
    • http://migisunutejelu.rf.gd/aranmula_vanchipattu_lyrics_malayalam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50213d97-e685-487e-b3a7-dbacdb881f9c/kosedopowoseja.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_off0000efcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 5088 bytes
SHA-256: 133e63fdf6bcd45837ff2e8bc98f6089a53b9f0fa6b6b1e7e9941375c141fd4a
font_01_sfnt_off0001012f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012F 10608 bytes
SHA-256: 84fbcc96e8cc4712ca20e5a3bd004bde8b3960fac850fd7ad52746b607936d52