Malicious PDF — malware analysis report

Static analysis result for SHA-256 b22b24f2bbbcafa1…

MALICIOUS

PDF

84.5 KB Created: 2021-03-10 00:20:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ec96bc690a7c87861713070817500b7c SHA-1: d69f9276d97c5782d5d30ad8e94798e82ea94b23 SHA-256: b22b24f2bbbcafa1eee7e816bd77eb7e091dacbd7cd367fc00184e261076abad
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URIs pointing to disposable hosting, suggesting a phishing or SEO manipulation scheme. The embedded URLs, such as 'https://midufefew.ru/award?keyword=anemias+microcytic+pdf', are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9129

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 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
  • 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://midufefew.ru/award?keyword=anemias+microcytic+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416125/normal_5fdf5369d2b02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407733/normal_60173a5d93949.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/jadotulunibug.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/18281137911.pdfIn PDF document text
    • http://sovadarasuzepa.iblogger.org/18352412108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447252/normal_6028fe9b96feb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464877/normal_6040649c4beb0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383929/normal_5fefcc60ab05b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450440/normal_5fcbfbe28d564.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376858/normal_5fe6deaf539d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417645/normal_603b5f426f3bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367622/normal_6027a75bc7de0.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/plan_unico_de_cuentas_para_comerciantes_en_colombia.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/july_2020_calendar_template_word.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366654/normal_5fd5f50cb546b.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/30200861847.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nunitew.rf.gd/airway_management_devices.pdfIn PDF document text
    • http://kagabefusexem.epizy.com/16282490392.pdfIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_47d80ed71b0b4591ba3f56d5dbcdfdfe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a9a0899-333d-4568-8297-dfc8d1c6614b/xuzapa.pdfIn PDF document text
    • http://maretazijedoval.epizy.com/84713927289.pdfIn PDF document text
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_f3f872777e5e441faa4d0543f4300bac.pdf?index=trueIn PDF document text
    • https://b1d4f555-1eac-4d61-aa83-27206cf3ee4b.filesusr.com/ugd/1706f5_757adf8d8f87437e87df5f55ed16f0f4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cc6abc2-825c-4a0b-94a3-d69e3cf1521e/hp_deskjet_960c_series_software_downloads.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10918 5360 bytes
SHA-256: f515c05655827009aaed2d2b6cd406e5510ee66bf5f48382096a928b7a7654c9
font_01_sfnt_off00011b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B45 10488 bytes
SHA-256: 57790ce8e4021e8052136c1ec1f5e38cc4e960d1901e20373fcfff1fb1319c7a
font_02_sfnt_off00013f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F68 16148 bytes
SHA-256: 98bbda09e34957c2c47eea570891e411fa41ced272e9777bbef021ce7395b75a