Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bfa2563355428d6…

MALICIOUS

PDF

71.7 KB Created: 2021-03-20 10:21:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9f088947d75c9ec8f120478361894d4 SHA-1: 2929d02b130cc3893b903d61643d89053ee0194b SHA-256: 1bfa2563355428d61fee0d5e096f1e883af20b8126aa326d5ed32554ef713f11
186 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing numerous external links to various domains, likely for SEO manipulation or to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, with the PDF being identified as a phishing trojan. While no scripts were explicitly extracted, the presence of many external links suggests a potential for downloading further payloads or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/strik?utm_term=the+river+radio+station+willmar+mn
    • http://jadebey-x.com/alkaline_diet_menu_weight_lossy7uel.pdf
    • http://soul-felt.com/sniper_modern_elite_v2_downloadx4c8j.pdf
    • http://tesidakikize.iblogger.org/95929052864.pdf
    • http://1xbet-registrat.site/hp_officejet_4500_g510h_driver_for_windows_7qavca.pdf
    • http://cheapkeys.site/school_counselor_report_writing8loyq.pdf
    • http://rameautbxy.space/turiwafukunubivapkutf.pdf
    • https://gorejorifal.weebly.com/uploads/1/3/4/8/134888975/fawowupivepew.pdf
    • https://suxapenogabako.weebly.com/uploads/1/3/4/6/134602080/0a17eabfeb53a.pdf
    • http://sayseedokg.com/zedufokutar49c43.pdf
    • http://plusstore.pro/eater_guide_hong_kongydzpt.pdf
    • http://coolvdomaion.online/24949256180j6v3b.pdf
    • http://fherixq.com/68068294085u3ey8.pdf
    • https://vuvudarekiw.weebly.com/uploads/1/3/4/0/134017261/9997325.pdf
    • http://lifegirls.site/46357410466a7wqx.pdf
    • https://fewefemuge.weebly.com/uploads/1/3/4/3/134372507/mavofewalujo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mirepili.epizy.com/dawivusavawetik.pdf
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_212b50989f7d47faa3e48cb19c914a49.pdf?index=true
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_c999a63434e349128e816d5012e1eab0.pdf?index=true
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_14742b5f757049fd915031ae87040838.pdf?index=true
    • http://bilunijo.epizy.com/minecraft_pc_terbaru_2019_gratis.pdf
    • http://pupenedu.rf.gd/75755383353.pdf
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_090a00a0f2ef46d398266e064231bd6c.pdf?index=true
    • https://bf808793-8b46-4c54-8b11-319763181fa0.filesusr.com/ugd/0d018b_96e782a0dc88451e997375dc52a73bbb.pdf?index=true
    • http://gatujezore.rf.gd/pawosomu.pdf
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_8dd80ed9c29f47fda964c1726953fdbf.pdf?index=true
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_f38810905f53435296f020204ca84d4e.pdf?index=true
    • https://8dcf3d85-40eb-4350-b789-ae6ac2c46e24.filesusr.com/ugd/21d17a_de2b0b23ec0744c8a451b95ec4910cdd.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db54.bin
920e9f22d4e3e1bc7b0da39ad9ff087170ff1255edfd7396eae1583e0269cf5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB54 5164 bytes
font_01_sfnt_off0000ecce.bin
af05844fd556a3716603de5e989c6bc16d2a7115b515b08208ac837721f27a2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECCE 10748 bytes

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