Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2bd328ed3f6d46…

MALICIOUS

PDF

75.5 KB Created: 2021-04-21 20:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e7a97b784f947185fbfee3e10f932379 SHA-1: 5a550ff2cf8cd80bc3dc3207e253a58924b81523 SHA-256: 4a2bd328ed3f6d4646ec53e52f81d2e001948d2e9f6c6afb076e26c35ab6b600
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded JavaScript payload that likely attempts to download and execute a second-stage payload from a remote URL. The document body and metadata suggest a lure related to 'Windows powershell 3.0 step by step pdf free download' to trick users into opening the malicious content. The presence of multiple suspicious URLs and the ML classifier output strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Embedded script payload in PDF stream high PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain script execution markers such as ActiveXObject/CreateObject, WScript.Shell, PowerShell, or shell-exec primitives. This is stronger than ordinary PDF JavaScript because it indicates a staged external script payload hidden in stream bytes.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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://soxebez.ru/strik?utm_term=windows+powershell+3.0+step+by+step+pdf+free+download PDF link annotation
    • http://gibelineg.sportsontheweb.net/9_point_hedonic_scale.pdfIn macro / runtime command snippet
    • https://cdn-cms.f-static.net/uploads/4490001/normal_6041bc0e47f47.pdfIn PDF document text
    • http://ravigimojamel.mypressonline.com/grade_6_math_word_problems_worksheets.pdfIn PDF document text
    • http://lutafem.getenjoyment.net/7069723622.pdfIn PDF document text
    • http://gonimuliveza.22web.org/tratamiento_de_anemia_megaloblastica.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369519/normal_600be0a6a4ece.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423714/normal_60675e1536df5.pdfIn PDF document text
    • http://safijejog.mygamesonline.org/64236414399.pdfIn PDF document text
    • http://wupemokabate.scienceontheweb.net/fovulevufafitivopegemuwal.pdfIn PDF document text
    • http://lotusedafefuwi.22web.org/74420807419.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448548/normal_6023d822a4144.pdfIn PDF document text
    • http://padojobimo.mywebcommunity.org/lizubu.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/notudimovokazivawizolu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408992/normal_5fef9f04f17af.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/8d9bfd3a-bd68-4c07-8b6a-dd248c988205/sonekixinopupebolofo.pdfIn PDF document text
    • http://vujapaporetakik.epizy.com/65221601947.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09aa0e62-3426-4548-a6da-422598a4b059/gibetubifunagewinez.pdfIn PDF document text
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_b2a72aab4a5849698024d68025df5675.pdf?index=trueIn PDF document text
    • https://6c892e0d-5736-4b4a-96a3-cd490fd1fe3d.filesusr.com/ugd/1407cd_f781099be3e147dba9dfe8719796a8fd.pdf?index=trueIn PDF document text
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_ed16eeef8b044f1fb85b18216347c60b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/25568406-f78d-4929-8551-db32b362af8f/what_is_your_management_style_interview_question.pdfIn PDF document text
    • https://a0bbd489-bf03-48a0-8e93-88abd0751e5b.filesusr.com/ugd/370ea2_a031eca848744b72a425c9277e8a715a.pdf?index=trueIn PDF document text
    • http://dinorafox.epizy.com/les_miserables_broadway_show_plot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5689246-5b02-458f-8ed9-ee2c8ac28273/simogilirasokosopiridet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_00012856.bin pdf-embedded-script PDF raw stream script payload at offset 0x12856 1652 bytes
SHA-256: 181f0dda6cbfcfaa454f2bc7426a6821c1fb331bad6914665d4896af1d906cc6
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 shell/COM execution token(s).
Preview script
First 1,000 lines of the extracted script
<?xpacket begin='' id='W5M0MpCehiHzreSzNTczkc9d'?>
<x:xmpmeta xmlns:x='adobe:ns:meta/' x:xmptk='Karbon'>
<rdf:RDF xmlns:rdf='http://www.w3.org/1999/02/22-rdf-syntax-ns#'>

 <rdf:Description rdf:about=''
  xmlns:dc='http://purl.org/dc/elements/1.1/'
  dc:format='application/pdf'>
  <dc:creator>
   <rdf:Seq>
    <rdf:li>Vakadebece Vewoferu</rdf:li>
   </rdf:Seq>
  </dc:creator>
  <dc:description>
   <rdf:Alt>
    <rdf:li xml:lang='x-default'>Windows powershell 3.0 step by step pdf free download.  Beyond Compare by Scooter Software is a pay-to-use program that compares file codes side-by-side. I</rdf:li>
   </rdf:Alt>
  </dc:description>
  <dc:subject>
   <rdf:Bag>
    <rdf:li>Windows powershell 3.0 step by step pdf free download.  Beyond Compare by Scooter Software is a pay-to-use program that compares file codes side-by-side. I</rdf:li>
   </rdf:Bag>
  </dc:subject>
  <dc:title>
   <rdf:Alt>
    <rdf:li xml:lang='x-default'>Windows powershell 3.0 step by step pdf free download</rdf:li>
   </rdf:Alt>
  </dc:title>
 </rdf:Description>

 <rdf:Description rdf:about=''
  xmlns:pdf='http://ns.adobe.com/pdf/1.3/'
  pdf:Producer='Karbon'/>

 <rdf:Description rdf:about=''
  xmlns:xmp='http://ns.adobe.com/xap/1.0/'
  xmp:CreateDate='2020-01-19T17:16:29'
  xmp:CreatorTool='Karbon'/>

 <rdf:Description rdf:about=''
  xmlns:xmpMM='http://ns.adobe.com/xap/1.0/mm/'
  xmpMM:DocumentID='084b107d-c6f5-45b7-a11b-37601e35d3bc'
  xmpMM:InstanceID='6e3c431f-bd25-461f-bf96-32f17868b71a'/>

 <rdf:Description rdf:about=''
  xmlns:xmpRights='http://ns.adobe.com/xap/1.0/rights/'
  xmpRights:Marked='True'/>
</rdf:RDF>
</x:xmpmeta>
<?xpacket end='w'?>
font_00_sfnt_off0000e8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FB 5816 bytes
SHA-256: 1e50059d7b61a4db80201b759f7d68dabbd7f153bd2d0e45c33da815b22d885b
font_01_sfnt_off0000fcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDE 10316 bytes
SHA-256: d4322ffba55bb153673dd1138d3984b8029cf2714abf148e55a9764bec45f40b

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