Malicious PDF — malware analysis report

Static analysis result for SHA-256 46a36a7d731d0878…

MALICIOUS

PDF

88.3 KB Created: 2021-02-22 05:54:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 0b59b78aa2a13f48ce641db9ef016e3d SHA-1: 978190b62a587e9e6575117500e3b1d28834dc5a SHA-256: 46a36a7d731d0878ddc266e827de38da6e0fc87850642571e3f7fe622890a933
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be link farms, suggesting a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of many suspicious URLs indicates a likely attempt to download or redirect to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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/wix?keyword=unidad+6+leccion+2+vocabulary+recognition+quiz+answers PDF link annotation
    • http://my-favshop.online/windows_10_activator_kms_autoiplml.pdfIn PDF document text
    • http://giftcard-sale.store/bluetooth_driver_dell_latitude_e6400770lf.pdfIn PDF document text
    • http://getveran.site/69043989955z5che.pdfIn PDF document text
    • http://mugedly.xyz/creatine_monohydrate_gnc_pro_performancek32ik.pdfIn PDF document text
    • http://fionainthefield.org/femiwijakivlsg5.pdfIn PDF document text
    • https://cdn.sqhk.co/bepoweruga/bjSWfqH/supertux_0._1_3_download.pdfIn PDF document text
    • http://keepmaxi.space/battlefield_2_complete_collection_passwordkngsn.pdfIn PDF document text
    • http://instapriz.online/patient_history_of_rheumatoid_arthritisgt478.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/mGidVeR/11420522857.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/jcgp1jf/tarex.pdfIn PDF document text
    • https://cdn.sqhk.co/barosevarega/Cih4hfh/83104740344.pdfIn PDF document text
    • http://theandyhong.com/bagefesiuveh0.pdfIn PDF document text
    • http://cyberlife.store/65450528683u21xs.pdfIn PDF document text
    • http://fitokapss.xyz/wubitinedabikenour6c8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kikumofesokir.rf.gd/google_sheets_excel_table.pdfIn PDF document text
    • http://zunaxixe.rf.gd/albinoni_adagio_sheet_music_organ.pdfIn PDF document text
    • http://maretazijedoval.epizy.com/word_games_for_phonemic_awareness.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB41 5952 bytes
SHA-256: b6c2e8ed440952efaf97338c2c272a5516bea580b869085e06886c27b3ac722c
font_01_sfnt_off00010fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAB 14848 bytes
SHA-256: ecf05cedc5b59678da176207d54f3673c6ae6b5da80e94994e2972517e899302
font_02_sfnt_off00013e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1D 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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