Malicious PDF — malware analysis report

Static analysis result for SHA-256 484637aad0a410bb…

MALICIOUS

PDF

85.3 KB Created: 2021-04-04 03:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 241527974fe13e7e393496825576b472 SHA-1: 23a15ae2bc942b3e002147e39f46ecc05adc8be2 SHA-256: 484637aad0a410bbbd97187b6660fa8902d658e15ec2a168ddde97161514ba76
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains a high number of external links, many pointing to disposable hosting, suggesting a link farm designed to lure users. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document prompts the user to install a browser extension or update, a common social engineering tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://botokaw.ru/strik?utm_term=painless+grammar+online+games PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465905/normal_604d754c2ca18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470218/normal_602822b297a9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415046/normal_601a86ef3e78b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476577/normal_6044d2dcc8255.pdfIn PDF document text
    • http://apkweb.net/vaxarazuddd273.pdfIn PDF document text
    • http://formblckr1.xyz/kedatonizulebu2dku7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501214/normal_6033716b3f206.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426280/normal_6068a6443265d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497093/normal_604d6765a5a82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467318/normal_602f68f71387a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490528/normal_5ff09a4930112.pdfIn PDF document text
    • http://medgaj.com/tcpdf_auto_page_breakkvu4a.pdfIn PDF document text
    • http://aycotoro5.xyz/jatuvupizilawuh7m2a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414678/normal_5feb47764fc0b.pdfIn PDF document text
    • http://parhelifrl.space/45890494623dwij6.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
    • https://uploads.strikinglycdn.com/files/80af197f-ff1d-467a-98ff-dec6953cf8cd/58733975907.pdfIn PDF document text
    • https://b3159766-6c8b-4733-a97d-e59ef6783693.filesusr.com/ugd/21851e_eb2217ac324b4cb9aeac53d4f321c9e0.pdf?index=trueIn PDF document text
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_2e9854e68e8d44bba918c6b3e5052eef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0a7952d-075d-449d-9d11-c4cd70ba2517/making_money_on_instagram_live.pdfIn PDF document text
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_042edd62020f4604b055161caee29d4c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a20426e-12f1-449b-b474-e127cb969324/vatime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1638843-cdd1-4d46-8c7b-139b47ba54db/necchi_sewing_machine_model_3537.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_off000103e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E1 4712 bytes
SHA-256: 1e873335ccd6c7e247b205f674d1697cad2b510d8480978bc93a6e85af9636ec
font_01_sfnt_off000113ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AE 11248 bytes
SHA-256: b4c5054dbba3f8f8505ac329b74e0c6b2640d301527627c10730b5256e9dae83
font_02_sfnt_off000139a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A9 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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