Malicious PDF — malware analysis report

Static analysis result for SHA-256 4806f16b88207ea4…

MALICIOUS

PDF

71.7 KB Created: 2021-03-31 04:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 31259a3e9e8d63cac9be1ef302a7eaec SHA-1: 3af9c074f14f7d3d60615b04c06a394cf98ff303 SHA-256: 4806f16b88207ea4f7f1081c562843879ba290abf48921aa01acca0da424403f
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 0.9997

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://pelibifir.ru/wix?keyword=change+your+life+in+7+days+pdf PDF link annotation
    • https://cdn.sqhk.co/nazujovo/gdicgdv/lokuwivesurupevumadufo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388289/normal_5fde576e55f12.pdfIn PDF document text
    • https://cdn.sqhk.co/togixulala/jem0gcr/50938414457.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/jjifxsG/21695816374.pdfIn PDF document text
    • https://cdn.sqhk.co/jakatote/KhhYGU5/big_bang_theory_definition_of_screwed.pdfIn PDF document text
    • https://cdn.sqhk.co/jozopotuwomo/hNzPhhM/70051166555.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402949/normal_5fe6226d2505c.pdfIn PDF document text
    • http://ewop.space/black_and_decker_20v_lithium_battery_trimmersl0mg.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/hdtjd4T/lemelifofatesotipemudol.pdfIn PDF document text
    • https://cdn.sqhk.co/xarupozikala/geyXijb/gutuseduzogatupuxumibejid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380411/normal_60003087550df.pdfIn PDF document text
    • http://omoikiri.info/hillsboro_school_district_salary_schedule_2019-20c06l0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_31fab4b5209c4a0d8fde091d998510c5.pdf?index=trueIn PDF document text
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_a05b11f3fc124f7296f6978fa5d0734f.pdf?index=trueIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_f0f7922a4bcc4d4a935817414f52d47a.pdf?index=trueIn PDF document text
    • https://05491ccc-77c7-428b-9c25-74f2c6c50d4a.filesusr.com/ugd/d51d36_5cfb0ea85358475080150fe16e85b1e8.pdf?index=trueIn PDF document text
    • https://a6f18165-9bfd-46c9-8f51-0ab50cd0b687.filesusr.com/ugd/265c7a_07857a32b7db4930b67647faf5cab54f.pdf?index=trueIn PDF document text
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_f90e0e1ba7bb4ecd846179cf03e73a14.pdf?index=trueIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_8de05f062c9e4f1bbd49174ac6517127.pdf?index=trueIn PDF document text
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_11dbab4d303744189c6093aab6c9ac7e.pdf?index=trueIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_19393842c9004d58ba0bddb6907d9375.pdf?index=trueIn 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_off0000dbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD6 5392 bytes
SHA-256: 85dbbd793e08eaf59a4c832130d3a18e165b06974784408043097f94e5f51e5e
font_01_sfnt_off0000ee37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE37 10264 bytes
SHA-256: ec52ae59cc18c68bc1dfd033006460986cecabd9c3a258b57008fe821c43d0be