Malicious PDF — malware analysis report

Static analysis result for SHA-256 2593e40ff2ca24dd…

MALICIOUS

PDF

76.7 KB Created: 2021-05-31 06:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8a15b9d0524f82ddd896d6334b4f9e53 SHA-1: 2ff1d98b4a1dcaed8b583105f58d46bd48b95ed2 SHA-256: 2593e40ff2ca24ddba22ce908a9d6a5f1faacbbb2381a74585f96148b78bcab2
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://soxebez.ru/123?utm_term=wordpress+template+ecommerce PDF link annotation
    • https://rudazijix.weebly.com/uploads/1/3/1/4/131453676/f4696e764da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379726/normal_5ff0c85f99eaa.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4491168/normal_60b19030ee4d4.pdfIn PDF document text
    • https://xedububedopo.weebly.com/uploads/1/3/0/7/130740082/faa5da01e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374838/normal_5feb4e1001914.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387046/normal_60294f7a4050d.pdfIn PDF document text
    • https://roletevuroza.weebly.com/uploads/1/3/4/3/134314330/bemilosogodajix_pivukipegu_padixativot_dinuvatuti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460450/normal_5fd82d1c12f33.pdfIn PDF document text
    • https://xebutikud.weebly.com/uploads/1/3/0/8/130813588/7022674.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456728/normal_5ffc4bd705719.pdfIn PDF document text
    • https://vopilejuwe.weebly.com/uploads/1/3/1/4/131407469/xanoperefew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389085/normal_6027c21e9707b.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/02a295c7-bf4e-460c-9666-8cc053747438/funny_gay_beauty_pageant_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44f30e41-5bb0-413e-94aa-ee87d86c3947/a_comparative_study_of_supervised_machine_learning_algorithms_for_stock_market_trend_prediction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/186cce76-c923-46ce-8ea5-a454c7d74817/vetanirediwaja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86f58300-c7ea-476d-902d-e5837e1882c7/girowotoxepazapevorel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e97c9774-e37f-40f7-ba77-251188156bf8/krups_waffle_maker_bed_bath_and_beyond.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/753224c1-4bde-4c63-ad7d-5717143bee24/what_is_a_permanent_dipole_a_level_chemistry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b029348d-5fdd-4482-ae07-b87b50f51457/school_psychologist_job_london_ontario.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a9a3e55-77af-4fe4-ad88-1b802fd72cf7/domonamubodomixi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66088426-35aa-4d97-9039-8ccfc76c631a/bofirexadegagatu.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_off0000f0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E8 5232 bytes
SHA-256: b624c5c2d3375fb2ec8c2dfc22d53efa40bac0bab79c3bd19b201a4e2eb6c98f
font_01_sfnt_off000102a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A8 10280 bytes
SHA-256: 5ac86f6464ecdd7761fe16e4f0325c101aef6e40e456c0769851e6a11046bd62