Malicious PDF — malware analysis report

Static analysis result for SHA-256 a407186ffcb883f0…

MALICIOUS

PDF

183.8 KB Created: 2021-03-08 14:20:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 46fac7b597e41d93a270f0d48183b58c SHA-1: f914bd124225f4a1d5038916426ebec4e03591b8 SHA-256: a407186ffcb883f03cab9548d8d70bed822447d49f1bbf04755ffb94a71b9f93
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting, and a primary URL that appears to be a redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9817

Heuristics 4

  • 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 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://fokemale.ru/strik?utm_term=alexander+the+great+empire+map+modern+countries PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368250/normal_5fc68f9828f28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486351/normal_5fcb3a5a4863f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465908/normal_6018483e07c14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450045/normal_6039f4733fd0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377371/normal_603ba3851aac0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386851/normal_5fc914b90c514.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393631/normal_603509d15e902.pdfIn PDF document text
    • https://dukuvelawabuze.weebly.com/uploads/1/3/0/9/130969723/bubakuwetam.pdfIn PDF document text
    • https://kibalenujodoziz.weebly.com/uploads/1/3/0/7/130776895/890730.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459621/normal_601ba6c00ae8b.pdfIn PDF document text
    • https://widowajezow.weebly.com/uploads/1/3/4/5/134584852/kizobosiwogume.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368477/normal_5fc816c75dbbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444092/normal_60287a59e541e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_3c3ab208b85b46faa7791673d70084b4.pdf?index=trueIn PDF document text
    • https://4d354257-8314-43f4-994b-4737921b64e0.filesusr.com/ugd/3835dd_652d6c81e6ae464294505dcc381dbef8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/acbbaadf-5ba6-43de-a3b1-e4a042e09697/7180442810.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a13659d7-d0e8-468c-8f28-967e053150b1/32327403316.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc2e70f8-9f8c-4f41-b4a0-9671a21c06c2/digital_photography_course_in_iti.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/62217339115.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/bomimerojikazupunufigab.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/what_is_ethical_and_legal_issues_in_nursing.pdfIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_e39f049f8380484e98cc426f28f177a8.pdf?index=trueIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002b311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B311 5428 bytes
SHA-256: 987efa97b3ddeac2989ecfb3298fabc304a13f27f7e10af597588219950cb519

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