Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86f444b478db3d3…

MALICIOUS

PDF

74.7 KB Created: 2021-03-22 03:26:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 728b6cad02a8f4f1cd9540f51f253892 SHA-1: bb7a501dd0afae1252c1caa183fcd8fdea35d085 SHA-256: f86f444b478db3d3e090ac6afe10262de878c6233c99edd144e0a20432f7a131
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external URIs pointing to potentially malicious or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically to host a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/strik?utm_term=amazing+fantasy+15+value+american+pickers PDF link annotation
    • https://cdn.sqhk.co/gevajoke/eidtl4h/roletawipusazugidol.pdfIn PDF document text
    • https://fuvukajewub.weebly.com/uploads/1/3/3/9/133999399/zemevinow.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/ajhjfnU/72357905078.pdfIn PDF document text
    • https://godanikepogi.weebly.com/uploads/1/3/4/5/134509841/tigefivofarifixej.pdfIn PDF document text
    • http://rixorevu.getenjoyment.net/42219994691.pdfIn PDF document text
    • https://sumulepali.weebly.com/uploads/1/3/4/8/134882140/kagunoxonivipin.pdfIn PDF document text
    • https://giderolimarova.weebly.com/uploads/1/3/4/0/134098849/sulumeguvesad.pdfIn PDF document text
    • https://cdn.sqhk.co/bowewulaxam/jhc1pOU/sobadazulusukumu.pdfIn PDF document text
    • https://roloruvibufezer.weebly.com/uploads/1/3/1/4/131410818/medomoxesozatorube.pdfIn PDF document text
    • http://fekevopimibun.sportsontheweb.net/lugiposo.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/ca3ad4ff-378e-49b1-bd3b-4be050bf300b/sifakinoloxabuverijizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f65df59-c1e0-4b7c-bd43-d81e90a1faf1/zigig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44c9e059-4e39-46c1-908d-8cdb9109b70f/maxurifufixodomakamig.pdfIn PDF document text
    • https://dc6b22d1-fd3c-476a-b8f1-b0505981f591.filesusr.com/ugd/ab5adf_1dd4da862d7c43f08f19b42ea3c3d184.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fb2afe0-8fe0-4f20-8e63-36ffb8578db7/46856754474.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9b0d0ca-5606-4d32-93d0-1b98b1d53206/doxisulunugopazibolif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a753fd6-be67-4d98-b557-843cc768c70c/identifying_linear_functions_worksheet.pdfIn PDF document text
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_27f96e146c844182ae558c951fbdff87.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ad43926-8b6c-4855-9a6e-3f144f79c462/how_to_use_vacuum_seal_rolls.pdfIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_e34164d6b3d24faa906eb9dca89b3c76.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/58fe5229-1355-4800-80e9-8e21454bc25e/nilanaxaperonizesokafaku.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_off0000e262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE262 5776 bytes
SHA-256: d33bdcd433bcb0603a0e24f0a28d38422e917223b9204363bd163a613e09eca3
font_01_sfnt_off0000f61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61F 11548 bytes
SHA-256: d96799921a57d21d670c250a8bab29fa09604d6bff248c18d87ffc03dc174a35