Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da32b088b6264b5…

MALICIOUS

PDF

76.2 KB Created: 2021-05-28 11:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3e627323e1dfd2658454dd7a929d9c2e SHA-1: cae9d42c593fa6c74f730646c3166d41dd152f0d SHA-256: 8da32b088b6264b55b2d8ecf70824878b755d0a42c159775f4c2bcce8e24fb44
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded links to external websites, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a tactic of directing users to potentially malicious content, likely as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=hide+column+google+sheets+app PDF link annotation
    • https://tomadukego.weebly.com/uploads/1/3/6/0/136083679/3301114.pdfIn PDF document text
    • https://daxeteven.weebly.com/uploads/1/3/2/8/132814811/suriwarologexim_wekonokajejif_vefixejuzevefe_bopinaronow.pdfIn PDF document text
    • https://pipulelinukebe.weebly.com/uploads/1/3/4/3/134364851/3735109.pdfIn PDF document text
    • https://waluxine.weebly.com/uploads/1/3/4/7/134759732/c0390.pdfIn PDF document text
    • https://bilujujopubeda.weebly.com/uploads/1/3/4/6/134661541/wiwore_sopewotut_gofikufeg_purirabukukore.pdfIn PDF document text
    • https://gikotaduxig.weebly.com/uploads/1/3/1/4/131454052/3241261.pdfIn PDF document text
    • https://kimonasisu.weebly.com/uploads/1/3/5/4/135400987/bopanotezo.pdfIn PDF document text
    • https://lanufirosonez.weebly.com/uploads/1/3/4/7/134704233/wamifim_wabupukurunut_sivowuzedo_sakunep.pdfIn PDF document text
    • https://xomixosusanit.weebly.com/uploads/1/3/1/4/131438267/0918d96c7c.pdfIn PDF document text
    • https://lekifusa.weebly.com/uploads/1/3/1/3/131382118/losoxedewo-relojunas-lonuvoxuvakod-gigimokik.pdfIn PDF document text
    • https://voteweze.weebly.com/uploads/1/3/5/3/135346586/991247875b0db3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c52744fb-9da0-45a3-98cf-6d6b54162061/8672091908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84363cf4-86a0-4b3f-9090-9c3b406130e3/download_film_ada_apa_dengan_cinta_2_lk21.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/058b62b9-3baa-4c61-875d-6b57c5552034/oil_filled_radiator_heater_safe_for_birds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c5683e0-b1db-403c-a074-9d31f860ceae/65991026733.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4b0fb1e-b314-439b-8304-92220b1ad230/tolosoradizoja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8761307c-ba5e-4428-8832-2635549a4290/zoputinubip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c3f8ab6-839d-4319-8045-44c79a9d1684/vukeki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9172528f-1b99-4264-a27c-e6920158f7eb/minn_kota_riptide_terrova_quick_release_bracket.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f912bb1d-c83b-4f21-b58f-4df40e89680b/how_to_measure_air_pressure_in_tires.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60c84325-8eb8-4c92-9af9-7d8e160d8cfb/jbl_flip_5_vs_charge_4_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e99adb22-2b7f-475d-b37f-1724a789902c/53743254177.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f702310-0cac-4cf6-92ec-40e7eab126e8/rozikobijopogirukaronele.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_off0000ede0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE0 5352 bytes
SHA-256: aeb9ed7d47599058c5cc63e8aa2bf93e38af037ae921e15f6e7fd4fcac986dbc
font_01_sfnt_off0000ffef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEF 10400 bytes
SHA-256: e510213f2eca4e70eaad21513474a0f676e298243eb591d81e8c9406b1902194

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