Malicious PDF — malware analysis report

Static analysis result for SHA-256 5758ffcc5f449b1f…

MALICIOUS

PDF

79.2 KB Created: 2021-04-23 19:40:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 178b4a31152dbf05ce784113f045352e SHA-1: 27dcc3d3ba3e8f104ab76eb7186556b64ae1a9b9 SHA-256: 5758ffcc5f449b1f8b7051a5b681642c2a99e87647d5faf2aeccf8600c42042e
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://zajinet.ru/strik?utm_term=que+es+ficha+textual+y+un+ejemplo PDF link annotation
    • https://s3.amazonaws.com/fajujiju/proform_745cs_treadmill_weight_capacity.pdfIn PDF document text
    • http://migriruy.ru/2776995767zr0li.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427103/normal_6005467ad2325.pdfIn PDF document text
    • http://julubavixukab.66ghz.com/everstart_3_amp_smart_charger_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/76074500596.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445879/normal_60323db0aba50.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/18674666426.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379363/normal_5ff7eeee68792.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/foruluvavuzefolowapip.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/danujubumelenixora.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379369/normal_601d764ab5353.pdfIn PDF document text
    • http://pop-marketplace.ru/superficial_thrombophlebitis_accp_guidelinesi7b9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492272/normal_5fcb098e9af44.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lelekon.epizy.com/66263294512.pdfIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_df5f41dc4b5b44a2bf22e255e1dc7f66.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a188a0e6-7229-414f-9910-58f218204a92/what_does_an_it_system_engineer_do.pdfIn PDF document text
    • https://0ca3454e-05ac-49fc-8d00-644b1af7be3c.filesusr.com/ugd/8bf3fc_2120f4b941f74948b2a2c5419d546875.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/04204963-c80a-4b2d-8c97-cbf3002882ca/el_hobbit_la_desolacin_de_smaug_personajes.pdfIn PDF document text
    • http://maderenefozido.rf.gd/78894619332.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c420df4-629f-4e0d-85e6-e7b548d3df99/jumizenag.pdfIn PDF document text
    • http://fuginifetulad.epizy.com/singer_sewing_machine_promise_1409_manual.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_off0000f566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 5464 bytes
SHA-256: 0c4464b5da15c84c132ea431507e773a15b057e812cdf61e2396af2dff71c533
font_01_sfnt_off000107f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F8 12532 bytes
SHA-256: ace5ab4fbefa71dfac6915732da44597081fb97f32cce1ef926bdf1e131105eb