Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af8cddce2554ee4…

MALICIOUS

PDF

67.8 KB Created: 2021-03-23 14:33:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4a936c1df48dec73aa1cba5fdc383189 SHA-1: 675aa95b41a3ca65df506e5a680656899a4173b8 SHA-256: 4af8cddce2554ee4ffb5184add212c9387a6d24faa24ae34749bda5670a54591
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://seumenha.ru/wix?keyword=aventura+spanish+1+workbook+answer+key PDF link annotation
    • https://kulitexujaw.weebly.com/uploads/1/3/4/0/134099612/murogijodojor.pdfIn PDF document text
    • https://sotemupavunu.weebly.com/uploads/1/3/1/4/131413148/3056023.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/gdTjdhi/htc_contacts_backup_to_pc.pdfIn PDF document text
    • http://xajavawinereko.mywebcommunity.org/malayala_manorama_calendar_june_2020.pdfIn PDF document text
    • http://rikafitamedad.medianewsonline.com/mazujezumirejexutuv.pdfIn PDF document text
    • http://wigageturuv.mywebcommunity.org/autocad_3d_design_tutorial.pdfIn PDF document text
    • https://seruvukajobal.weebly.com/uploads/1/3/4/4/134479042/db9a17c.pdfIn PDF document text
    • https://cdn.sqhk.co/dufadafakuti/AkJdicI/basketball_shooting_shirt_designs.pdfIn PDF document text
    • https://cdn.sqhk.co/bolukawet/eahhVb5/cyberfoot_2007_serial.pdfIn PDF document text
    • http://kabomodom.iblogger.org/atresia_duodenum.pdfIn PDF document text
    • https://cdn.sqhk.co/naruxibe/jCzibhd/nom_factores_psicosociales.pdfIn PDF document text
    • http://vugiris.22web.org/cloud_types_printable_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/reditifotep/j9YhhPT/zuguvawukekojikevij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_5d79cbc5df8a46cd85fdd93f9622d814.pdf?index=trueIn PDF document text
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_6f5b430347ac42b28a676c428ffa23aa.pdf?index=trueIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_69d213cdc35549f3a2d3302691f62942.pdf?index=trueIn PDF document text
    • http://pexaniruvuwuwe.rf.gd/chimney_inspection_report_template.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC6 5372 bytes
SHA-256: 2299f39b7cba20d92242c1d981c1bf79dd91c211518090b7e60d7ccc06844a10
font_01_sfnt_off0000df26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF26 9784 bytes
SHA-256: 3da29661b1807277113d397213393127133e1b6637534b118b31e2c7f78cc2e7

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