Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd185c4faaaaede5…

MALICIOUS

PDF

80.7 KB Created: 2021-05-20 04:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c5b928fd09a3b712fb719a970ee647ed SHA-1: 58e9de5806dd20ac1d1fb5029a9e7b1081a7a95d SHA-256: fd185c4faaaaede580224b2e3deed6beb559e57538578c6c92c601f7a51dbe15
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 0.9998

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://bologen.ru/strik?utm_term=how+to+fix+e6+error+in+voltas+split+ac PDF link annotation
    • https://zunurevupuvofas.weebly.com/uploads/1/3/1/4/131438471/bamabijobusu.pdfIn PDF document text
    • https://ruvavebi.weebly.com/uploads/1/3/5/4/135401399/fovapazigeve_rozajisuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426557/normal_602ffb1e6a0f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481409/normal_5fe853502c8fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367648/normal_600d439d50150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450514/normal_5fd61af7aca7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449411/normal_605fe9be7f271.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481424/normal_6008e7a0d92f3.pdfIn PDF document text
    • https://wiwujakibites.weebly.com/uploads/1/3/0/7/130740442/399e320d1a2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368506/normal_5ff3e0a441c8f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495985/normal_5ff8f0fa11846.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481402/normal_5fec48b3c6dfd.pdfIn PDF document text
    • https://puzomukasudugun.weebly.com/uploads/1/3/4/8/134865935/5030794.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/40a71800-fbfb-4a52-a1ac-72ba971fd81c/what_is_the_criminal_justice_system_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/380b5f14-55fa-4b12-a41b-059389571f73/hitchhikers_guide_to_the_galaxy_movie_download.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/cibt_russian_visa_application_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2af3a9b5-ef45-4ecd-9149-bf1185c57091/what_type_of_oil_does_a_champion_generator_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c22d858a-d7c7-4798-8b1b-f213090797dd/87930380568.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/ashton_kutcher_and_mila_kunis_that_70s_show.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ec5a227-3134-4a32-8390-2b9b3b28ab25/ruvizudebakok.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_off0000fe86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE86 5344 bytes
SHA-256: 5ebd116f047433f629743c42929bf6502ef479a154272710f2df1526c625912c
font_01_sfnt_off000110d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D9 10716 bytes
SHA-256: 13cf340c1a8f21c84385000b2c342d09774b15ca626baed41c10823afa6e075e