Malicious PDF — malware analysis report

Static analysis result for SHA-256 66276a7b138aa891…

MALICIOUS

PDF

71.9 KB Created: 2021-05-08 05:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8ebeac98717fca5efe5d164890168297 SHA-1: 579098ed77fa08c3fe448acba98131cce8e57421 SHA-256: 66276a7b138aa8910d0a38923665255a691f27c43ede273808701b5ee0d1f185
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 0.9993

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://druttle.ru/strik?utm_term=premade+d%2526d+campaign+5e+free+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416153/normal_6067d70897f94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379856/normal_603fcd0960fef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479938/normal_5fc75e13b73c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403422/normal_604ac781042fe.pdfIn PDF document text
    • http://juzufezike.mygamesonline.org/44013768362.pdfIn PDF document text
    • http://retapadu.medianewsonline.com/crossfit_workout_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421630/normal_60349fe734190.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427820/normal_6058c8d687774.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424029/normal_5fe9f3944934d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470387/normal_6035f06c03790.pdfIn PDF document text
    • http://vimobewawulipiz.mypressonline.com/bitmap_image_converter_to.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479470/normal_600ce6ddd2f52.pdfIn PDF document text
    • http://niwopofe.scienceontheweb.net/altivar_31_manuale_italiano.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_ddec30ae3b1a4e64bf81cf0e5dcf4f6b.pdf?index=trueIn PDF document text
    • https://cdb53ace-3f3f-41e1-823e-0ecf3add8ba2.filesusr.com/ugd/47e9e0_a4276b2104dd4ed6a44152d2e01ca79e.pdf?index=trueIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_0bf1bfd521a34898adc05f062fc8009e.pdf?index=trueIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_d97e4eecbc5a4a9b9e7ebe16c329817b.pdf?index=trueIn PDF document text
    • http://damowepoko.myartsonline.com/breeds_of_horses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4462d63d-0568-4a0d-a029-3506f9858e94/40036438267.pdfIn PDF document text
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_ca3e1d8d5e5345fe9f0a0f1f8944b3cb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de6da82f-72b7-4d1a-8f4a-f27ce6278ca2/29994505127.pdfIn PDF document text
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_9964167e702548e08a5e99f5916bd923.pdf?index=trueIn PDF document text
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_3484c75d0f9b43d4adc55f86de4228e5.pdf?index=trueIn 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_off0000da7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7E 4764 bytes
SHA-256: ad21b8ad57503804d97a01b9c0290da6d215895093bfccf0b86e9c0c1dea2552
font_01_sfnt_off0000ea90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA90 11700 bytes
SHA-256: 848ddbb20b43320ec9b488877077c3f829d21e9ec441b07dbd25c4363316e13c