Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d12b0b0ccecc54…

MALICIOUS

PDF

74.5 KB Created: 2021-02-20 06:47:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 25722c81974dfe3b77f7f61d1076f4b9 SHA-1: 77f91c124ace8ed10c936f08fc816cbca721dff7 SHA-256: b5d12b0b0ccecc549ae33fe2d8652d1c632ea6f80faf9745034b828508c17416
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used 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://leonvi.ru/strik?utm_term=kingdom+principles+definition PDF link annotation
    • http://navalny.design/lagu_ampar_ampar_pisang_versi_karaoke8g7r6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418575/normal_601fb2d9793ac.pdfIn PDF document text
    • http://vagijuderotogur.22web.org/despicable_me_1_full_movie_480p.pdfIn PDF document text
    • http://blog-millionaire.buzz/fumekagumopizedogujepo6n9jd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450347/normal_601c8cc871609.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390055/normal_60222389007d7.pdfIn PDF document text
    • https://cdn.sqhk.co/vejuwipem/DgfyYGC/claire_modern_sofa_with_metal_legs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502268/normal_602810ab37e4e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387226/normal_5fff365630fdb.pdfIn PDF document text
    • http://nefidale.22web.org/colorectal_cancer_surveillance_guidelines_uk.pdfIn PDF document text
    • http://myfoxing.online/hdfc_ergo_motor_claim_formumlvp.pdfIn PDF document text
    • http://tryici.xyz/resistance_3_trophies_guidefr7hf.pdfIn PDF document text
    • http://pr-bux.online/reaper_miniatures_paints86en.pdfIn PDF document text
    • https://cdn.sqhk.co/tolebilu/S4jhumT/desiwadora.pdfIn PDF document text
    • http://yogist.fun/wojudiwokojifujeresupow9jt8.pdfIn PDF document text
    • http://cabinetshub.xyz/cg_vyapam_ppt_result_20198r2co.pdfIn PDF document text
    • http://rotelebi.22web.org/xewunosuzavegiga.pdfIn PDF document text
    • https://cdn.sqhk.co/surofowudula/FjhGGnt/defunekisu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://devisufuxuvit.epizy.com/63344068284.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA09 5020 bytes
SHA-256: 80b58e1fc5aec7f56bfc2a976e3be72c52f223fda0a19ab5d4ddcdd65fa7b8cf
font_01_sfnt_off0000eb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB05 10480 bytes
SHA-256: d8749e932bdd2bf879b8c2ec3ec9c85d2095461b64a5d6fd8a2d86a0d04d07b5
font_02_sfnt_off00010eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAC 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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