Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb4f1ba1968f1255…

MALICIOUS

PDF

79.8 KB Created: 2021-03-27 11:33:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 56066f177509ce8e2b95d7824ad44486 SHA-1: 530f1d9084c55a612f27280fa54a78c4e484c59e SHA-256: eb4f1ba1968f12554fb0de5de34159f3479568623a360448670de08941396802
126 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, appears to be a lure related to updating router firmware, directing users to external URLs. The presence of embedded URIs and the link farm heuristic strongly suggest a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/strik?utm_term=actualizar+firmware+router+d-link+dir-615 PDF link annotation
    • http://fuvagezilavez.mygamesonline.org/xaluv.pdfIn PDF document text
    • http://gezinuduwep.medianewsonline.com/xosenowogilosaderofa.pdfIn PDF document text
    • http://dufifudusimube.mygamesonline.org/restrictive_and_nonrestrictive_clauses_exercises_with_answers.pdfIn PDF document text
    • http://plusstore.pro/pajuvapel8vuee.pdfIn PDF document text
    • http://form-copyrightservices.com/55887323683flpnm.pdfIn PDF document text
    • http://kukushpa.fun/54558930893f3eb7.pdfIn PDF document text
    • http://vovality.club/dabamofubetizumivubumoby8i9j.pdfIn PDF document text
    • http://wumomotetidofe.getenjoyment.net/rosatuluzenibafo.pdfIn PDF document text
    • http://tapozifokun.mywebcommunity.org/sidizalomil.pdfIn PDF document text
    • http://lenudes.com/89480285958oj0z8.pdfIn PDF document text
    • http://gofadivus.mygamesonline.org/biodata_format_for_marriage_for_girl_in_marathi.pdfIn PDF document text
    • http://luziniwanemek.sportsontheweb.net/bibliografia_formato_apa.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/epidemiologi_penyakit_jantung_koroner.pdfIn PDF document text
    • http://zafikapasipugog.medianewsonline.com/antibiotic_sensitivity_test.pdfIn PDF document text
    • http://kapovulup.mywebcommunity.org/63684314774.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/85933577186pck0r.pdfIn PDF document text
    • http://future-techno.ru/what_is_a_normal_abg_for_a_copd_patientrxvhp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://womawujun.atwebpages.com/what_to_read_after_captive_prince.pdfIn PDF document text
    • http://sugamane.onlinewebshop.net/streamline_english_connections_workbook_b.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c6fc1f4-24db-43c8-ac3d-ab62f6c25ec4/zexefarudapozobegipatu.pdfIn PDF document text
    • http://wovibojo.onlinewebshop.net/nopugafaziwebitosalutuluv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7a78832-3923-43a1-a11c-8eb4b38b49ff/fegejabinijam.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_off0000f828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF828 5548 bytes
SHA-256: c869ade58c59393a2480e01e2a62d933e4789c3cc64d47e5a031953cb3928e6c
font_01_sfnt_off00010b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B20 11700 bytes
SHA-256: 1cd7d19eb849ef74c0d7d1c6257240f749557d50e52dbf326d5cd08ac973f91a

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