Malicious PDF — malware analysis report

Static analysis result for SHA-256 d30363a196ce4b5f…

MALICIOUS

PDF

70.8 KB Created: 2021-06-10 14:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ebc7fbab6ca424659d87d93e0b3eb652 SHA-1: cc4d0782e42b93fe3265810c33344eee4f8dcd92 SHA-256: d30363a196ce4b5facf0c378d429eb1ffd906f1c9c35ef60796c925fffef9ed2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple external URLs, with one specifically identified as a link farm designed to redirect users. Heuristics indicate it's a phishing or malicious PDF, and ClamAV detection confirms its malicious nature. The ML classifier also strongly flagged it as malicious. The embedded URLs suggest an attempt to direct the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crysiq.ru/pbw?utm_term=types+of+adjectives+worksheet+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446272/normal_5fccb02d591ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465264/normal_5ff3b8e799b9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406481/normal_6047210abff8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375071/normal_5ff9abc4de3b2.pdfIn PDF document text
    • https://lovefuzabuzonif.weebly.com/uploads/1/3/4/1/134109130/vulenanavi_xijosurog_fenekegepalifim_fefizi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471958/normal_604dba8431ea4.pdfIn PDF document text
    • https://sabovewedasujak.weebly.com/uploads/1/3/4/4/134493104/folipidede.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408989/normal_6062df594e289.pdfIn PDF document text
    • https://rilumegunelado.weebly.com/uploads/1/3/4/6/134615428/vazidinemuseso-duwetojo-lujas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383704/normal_5fff29d98d57d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369626/normal_5ff1b494eaa7c.pdfIn PDF document text
    • https://kiwilepivuzapox.weebly.com/uploads/1/3/4/4/134490275/409245.pdfIn PDF document text
    • https://vaxevadokipab.weebly.com/uploads/1/3/4/6/134610393/kesevadidasadazetu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://radejaki.pbworks.com/w/file/fetch/144766731/zarupukexixalunujul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea38b404-1edd-48a1-9960-4dce251542d2/g-shock_ga-1000-1a_battery.pdfIn PDF document text
    • http://dujimowiwup.pbworks.com/f/ficha_descriptiva_preescolar_2019.pdfIn PDF document text
    • http://gufabewa.pbworks.com/w/file/fetch/144699417/formula_para_calcular_el_volumen_de_un_prisma_triangular.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5e898e7-db69-47c5-8fc0-bc8a8b7c21a0/unitypoint_methodist_peoria_il.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41b020f5-b67b-4499-8f6f-04ee13016c50/gutugibetojapopup.pdfIn PDF document text
    • http://wamotarirup.pbworks.com/f/71896746265.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/f/39263236131.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_off0000d9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C3 5552 bytes
SHA-256: 2c5d22f77461740a724f18b2392481cdadae68177d9cb1f233010c83abfd262e
font_01_sfnt_off0000ecc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC3 9792 bytes
SHA-256: d3c9f10e8c0d2694489daf1d5a6b4dd8bf59aaa6afabaa5149220026f9052fc8