Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1d018470324bce…

MALICIOUS

PDF

81.1 KB Created: 2021-04-07 13:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 01570ad11dc86cb2263609be4b15813f SHA-1: 240f56e5c35ce4bc06275cf723e8656caf03a7d9 SHA-256: 8a1d018470324bcef7f6f26375af97a4895f4c7b2be742ada8269184e1508faa
184 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by multiple heuristics and a machine learning classifier. It contains numerous embedded links, many of which point to disposable domains and redirector infrastructure, suggesting a phishing or malware distribution attempt. The presence of the 'utm_term' parameter in one of the URLs indicates a potential phishing lure related to educational content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=short+moral+stories+in+hindi+for+class+10 In PDF document text
    • http://dresdenpharma.ru/wexabirufekiygkmh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386591/normal_5ff668dbd6d04.pdfIn PDF document text
    • http://gobitujesan.scienceontheweb.net/3965176945.pdfIn PDF document text
    • http://reduslim-buy.site/biografia_de_pericleshy7ih.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488137/normal_6009ded778868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460477/normal_601d7799be7c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417429/normal_5fc7972661a1c.pdfIn PDF document text
    • http://particulieres-societegenerale.best/31374840980fomm9.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/cNDa1Vl/5807780385.pdfIn PDF document text
    • http://larijasetejupaz.mypressonline.com/loranasanipopalilaledobo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501777/normal_605f925be7cfc.pdfIn PDF document text
    • http://mudikovarew.mygamesonline.org/revit_architecture_residential_house_design.pdfIn PDF document text
    • http://atomyimperial.ru/panamojaxisawodimus8we.pdfIn PDF document text
    • https://cdn.sqhk.co/sepetuvab/hdibwS4/paypal_customer_service_contact_number_canada.pdfIn PDF document text
    • http://xonigej.mypressonline.com/ahlan_wa_sahlan_magazine.pdfIn PDF document text
    • http://medilawibume.scienceontheweb.net/spark_4_workbook.pdfIn PDF document text
    • https://bikugepoxo.weebly.com/uploads/1/3/5/3/135351236/vupez_repuwes_nevan_wibomiros.pdfIn PDF document text
    • https://sopazamiwurigu.weebly.com/uploads/1/3/4/3/134387891/874088.pdfIn PDF document text
    • https://cdn.sqhk.co/sifomujotaxa/5aZhgqf/fallout_shelter_pregnant_not_giving_birth.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/risisipajole/59569785199.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/solubility_examples_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/faravo.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/tesewikaki.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_off0000ff3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3D 5556 bytes
SHA-256: 0602651da8a967e0743ad97c9dbb710cbe4946076d53791c86d8ef2c4f35e27f
font_01_sfnt_off000111f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F4 10704 bytes
SHA-256: 9dc4439214b2de2eba3e486355f364344f5d38b83756e971dba2cd75e1a3d392