Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a9902b6783b50fa…

MALICIOUS

PDF

87.9 KB Created: 2021-06-09 00:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 46a257b7c373b16d8564e2585928e239 SHA-1: 537bc22b6b272bf8dc31b8c9bf8fb08f5b092d87 SHA-256: 9a9902b6783b50fae0d060e7867a11c380168bb6f6c613022f7e44ad4ca07dd4
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 0.9992

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://cructi.ru/pbw?utm_term=fate+of+the+furious+subtitles+download PDF link annotation
    • https://tuwazumabokanif.weebly.com/uploads/1/3/4/6/134611666/917119.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369653/normal_606a1c7d83044.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405652/normal_5fd77e612da67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416806/normal_601314419ac03.pdfIn PDF document text
    • https://kufudazasa.weebly.com/uploads/1/3/4/6/134626120/nipizizutivo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527902/normal_60598e8156e1c.pdfIn PDF document text
    • https://lefatelaxebaj.weebly.com/uploads/1/3/5/3/135398996/buvul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/55d94b7b-c64c-4a4d-901a-fad0d3e36332/twilight_saga_eclipse_tamil_dubbed_movie_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d98c991c-2a85-4acf-9d07-ae94574b7145/bloody_roar_2_juego_descargar_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06a0f0e8-a081-4d70-8b03-36bca38a4614/air_conditioning_and_refrigeration_troubleshooting_handbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84157bf0-1931-4100-ba66-ec16df6c8c30/statistics_for_managers_using_microsoft_excel_7th_edition_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e302019-0d7f-4f90-893a-341d28e08a5d/99996186634.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e6274c9-f71b-483c-bbcf-420ea0d8e071/64929780966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26c2f540-dede-4413-a5f2-6014ec6f464d/how_to_assign_a_real_estate_contract.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03723df2-7c19-466a-9bd9-7cc0afa08584/how_to_fix_samsung_washer_error_code_3e.pdfIn PDF document text
    • http://rekadezabo.pbworks.com/f/nyc_doe_2020-21_budget.pdfIn PDF document text
    • http://gamaxidad.pbworks.com/f/is_oracal_631_permanent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df41867c-b88e-4a58-9b56-4f7717bb64d1/meruzejev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdf04e88-4194-492b-8acd-adfde01d89aa/kagudife.pdfIn PDF document text
    • http://xetibubib.pbworks.com/f/86756844965.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b7b54cc-e7ae-4b6e-98b8-d0e7fc79cee3/weight_watchers_scale_reset_user.pdfIn PDF document text
    • http://vulazojab.pbworks.com/w/file/fetch/144546222/xojuxejalagitesa.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
    • http://scripts.sil.orgIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF750 5064 bytes
SHA-256: f16f67adcdaa3add8d9b440d7203d926139f0799335dd7407d2eef72dbc375cc
font_01_sfnt_off00010894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10894 12228 bytes
SHA-256: 587d7c5ebb94b478154a37266dfa9b76504cb57594eb5e9f2f8392d4af1f8dd2
font_02_sfnt_off00013012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13012 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
font_03_sfnt_off00013e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E10 6184 bytes
SHA-256: 09c2f74ec5b0b6831f537ef34cae4230117ccb50acdc399503df275bd77d90d2