Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ba9a00d3fb0aabb…

MALICIOUS

PDF

81.2 KB Created: 2021-06-07 13:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8bc11dce9d2f4f3461ee9cfeb274667e SHA-1: c98a440002ddb8b45d9311ef5676b898765dff4f SHA-256: 9ba9a00d3fb0aabbd79b818161e64dc5cc51a0cd9e3f568c5cac8a88934e2979
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • 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 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://ketchas.ru/pbw?utm_term=geometry+dash+2.2+release+date+robtop PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468820/normal_60241d8462492.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411218/normal_60477119a8319.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527237/normal_6059bd4ccb862.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454973/normal_5fcb4979ca33f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366369/normal_5fc5aa2a9eb9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485014/normal_60b89addef333.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393890/normal_6023045469bf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369651/normal_604104030872c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393353/normal_60bd5b8639089.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450354/normal_60bd927e371e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379500/normal_604888267c046.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384632/normal_6016c56ce7395.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479902/normal_602e1bc846406.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ronefete.pbworks.com/f/vifimutetexipukaladuwap.pdfIn PDF document text
    • http://furalagaposu.pbworks.com/f/uniform_circular_motion_worksheet_with_answers.pdfIn PDF document text
    • http://dumogaluz.pbworks.com/w/file/fetch/144673428/joluvitelujexa.pdfIn PDF document text
    • http://sujagajo.pbworks.com/w/file/fetch/144734304/practical_statistics_for_data_scientists_50_essential_concepts_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/410d549e-f2b8-4eb2-854a-c1a91f8dab60/xitogegewal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfc2b523-cbef-49ab-909d-26c915c8311b/singer_brilliance_6180_manual.pdfIn PDF document text
    • http://zufiwuz.pbworks.com/w/file/fetch/144657051/what_about_bunny_tiktok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/832782af-f80b-47e7-b505-d4a8e8aa8995/39700990584.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d38e0d0c-4c50-4bad-855c-d481567b0977/30315300720.pdfIn PDF document text
    • http://dawanitapix.pbworks.com/f/surface_area_and_volume_of_composite_shapes_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81fc1f91-ebd6-464b-8b11-cb2aab348e0c/hoover_power_scrub_spinscrub_carpet_cleaner.pdfIn PDF document text
    • http://pulixojesu.pbworks.com/f/sims_4_how_to_make_your_own_custom_traits.pdfIn PDF document text
    • http://feteselulo.pbworks.com/f/can_yoga_increase_height_after_18.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_off0000ffcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCD 5636 bytes
SHA-256: e2f88b67a2c1accab78d93708825eb258a1e780d14d6284a7f68bcef103ec50c
font_01_sfnt_off000112d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D5 10372 bytes
SHA-256: 2ea71892adffd27adc9cfbd8e2dc54494eb1cc8e80ecf0a732a724b8e568226a