Malicious PDF — malware analysis report

Static analysis result for SHA-256 e253814c54ca7b56…

MALICIOUS

PDF

81.4 KB Created: 2021-04-03 15:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d820a4377660a0f501f436248e11e56e SHA-1: 0b4ea13925068f06acd94130eb39dbb061ba73a0 SHA-256: e253814c54ca7b56e895491624b74795d6df7ca06eca2804751d73bb3c020376
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

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://leonvi.ru/aws?utm_term=what+is+a+visual+learner+called PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374366/normal_604ab1c752b11.pdfIn PDF document text
    • http://nunesop.scienceontheweb.net/99816941412.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452593/normal_60635b513a20f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412584/normal_5fd6742c4aea6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450634/normal_6066b47b2af4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388426/normal_602883303b4fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483836/normal_605a1ad4218fb.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/mofunugotipu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461207/normal_6026dac898997.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489979/normal_5fee9a3f3c685.pdfIn PDF document text
    • http://pogekoxuw.mygamesonline.org/gowokesejavowularevuw.pdfIn PDF document text
    • http://javaxirivibewi.mygamesonline.org/causes_effects_and_solutions_of_land_pollution.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/8c892465-c0a4-4c8f-9414-1bf73e49a2f1/holiday_2020_makeup_releases.pdfIn PDF document text
    • http://kepofif.onlinewebshop.net/pdf_book_marketing_management_philip_kotler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/329f603d-6070-4ae9-a4d3-54e4e836118d/dell_t7500_motherboard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5f1b717-82f0-4067-b619-0e4e257a47eb/system_engineering_process_v_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3a03c0e-81a6-4009-9ad9-296f1e63b366/master_of_orion_conquer_the_stars_cheat_engine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88c66482-1ebc-4958-8d06-15e07731a4dd/ph_practice_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be391992-9a97-495f-8c6c-34b4c3421118/how_to_add_and_subtract_polynomials_with_different_exponents.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/300cd02d-3939-42cd-bfdc-8c4e0e20070b/76111354543.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cabdff7-3eab-40e8-8b11-961c56a21b6c/satofifekowamumog.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_off0001016f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016F 5100 bytes
SHA-256: 2d6195ebdcf6a8aaf47a567b957f8d92a472b93debc2c5136f3654724f7a4901
font_01_sfnt_off000112d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D0 10932 bytes
SHA-256: a07db70da08cf8b2eace377059706be5f7bfd88866597393f0bcb4ae53bb69eb