Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb32ac64b4ad69cb…

MALICIOUS

PDF

76.8 KB Created: 2021-05-19 06:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ffb6c4e4e18f28fa079ec000f1e1a961 SHA-1: eecc248c4a0f591b5a34f3d5900c6730601c9608 SHA-256: cb32ac64b4ad69cb0c6c04048360e4b6c4dd2e2f2e5518289a95f686ed88c121
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to link farms hosted on disposable domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. One prominent URL, https://jacksth.ru/strik?utm_term=cuantas+carretillas+es+un+metro+cubico+de+arena, is directly referenced in the document's metadata and heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/strik?utm_term=cuantas+carretillas+es+un+metro+cubico+de+arena PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379723/normal_605ab91e470e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470014/normal_600628b0b317d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406169/normal_605dcab5e9dce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408346/normal_5fd76c8c66338.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446635/normal_601b20253dca9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ratebasazor.epizy.com/22023384108.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5a824b4-ffd7-40bd-95fd-b5db0c36ef29/how_to_treat_acne_scars_at_home_naturally.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3afb2bd1-1ba7-4279-8c3f-74774a9efdf0/18051945450.pdfIn PDF document text
    • http://fogevodazeta.epizy.com/54073226059.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b48aef3-8e0c-4e3b-a62b-5a74a5a6dcc6/44379792117.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/375b0055-5a84-40db-8fbb-41d98fa672c9/rock_climbers_training_manual_forum.pdfIn PDF document text
    • http://fezesotufixodow.epizy.com/joomla_templates_for_nonprofit_organization.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/313d93db-1732-4ebb-bc1a-c02f0f8ce3c1/hitchhikers_guide_to_the_galaxy_film_review.pdfIn PDF document text
    • http://bupujipa.epizy.com/50237497577.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/united_technologies_annual_report_2018.pdfIn PDF document text
    • http://falalovoxiwada.epizy.com/gasutazerugikobalox.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/50321826582.pdfIn PDF document text
    • http://mikesivu.rf.gd/banelumeneruwuworase.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/fedramp_policy_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5e8d4a0-e8c8-4136-a65f-8e0eb77b8a1a/happy_life_love_quotes_images.pdfIn PDF document text
    • http://xulodolab.epizy.com/47292262199.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04dae604-47ff-49bb-ac33-9f26a1d392cc/73928824048.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b17f7f4-be52-4ee0-b20e-693d89d4e270/76268646180.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/84935986508.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/7372757793.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_off0000ec11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC11 5128 bytes
SHA-256: a567f3d7d87f335c234360a988631e43579c63498cd7d025375cc7e8da5719ea
font_01_sfnt_off0000fd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5C 12496 bytes
SHA-256: 15bf3063faf1b52a7ef750cfcf2540346a33533c81033793d5be4a4ac90442ae