Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9aa54140720921…

MALICIOUS

PDF

49.6 KB Created: 2021-02-07 21:01:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 474326c8d3dce607910e68795eee8569 SHA-1: 82d64c60c168426befd71e170e9a8e926245906c SHA-256: 5b9aa5414072092194ffaebc6d21cf60c9cb58cc9cffbd018b3c04f60fb19742
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf and mentions 'weather fronts worksheet answer key', a common lure for educational-themed phishing. The presence of numerous external URIs and the ML classifier's flagging strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7805

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 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://druttle.ru/aws?utm_term=weather+fronts+worksheet+answer+key PDF link annotation
    • https://dowusezawidi.weebly.com/uploads/1/3/3/9/133997386/9051669.pdfIn PDF document text
    • https://dosasefezopalan.weebly.com/uploads/1/3/1/3/131398547/xoxeropoviwefibex.pdfIn PDF document text
    • https://pedogore.weebly.com/uploads/1/3/2/8/132815008/50a0d9.pdfIn PDF document text
    • https://putofikanavo.weebly.com/uploads/1/3/0/7/130738484/xoxokoja-tiboxon-rukesozifune.pdfIn PDF document text
    • https://dudegakabiwuzab.weebly.com/uploads/1/3/1/4/131406663/rijizo.pdfIn PDF document text
    • https://musevupuli.weebly.com/uploads/1/3/1/4/131438528/nozefigusijuba-lomigomofajif-loluw-zikugixif.pdfIn PDF document text
    • https://famutogerene.weebly.com/uploads/1/3/4/6/134688643/xadijituwaken.pdfIn PDF document text
    • https://tadesurirow.weebly.com/uploads/1/3/2/7/132711952/0d0d61.pdfIn PDF document text
    • http://ziboporo.epizy.com/sejojudemovopumajo.pdfIn PDF document text
    • http://xizajitidug.rf.gd/12392743954.pdfIn PDF document text
    • http://wosakev.epizy.com/semicolons_and_colons_worksheet.pdfIn PDF document text
    • http://tekunobujolid.epizy.com/zokuguxirakesedifibikoti.pdfIn PDF document text
    • http://lafugigolemetuk.rf.gd/zoxejetudefavonufagag.pdfIn PDF document text
    • http://desuvusemexemob.epizy.com/gijatibuteragirusafo.pdfIn PDF document text

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