Malicious PDF — malware analysis report

Static analysis result for SHA-256 f833b44c2fac2ff2…

MALICIOUS

PDF

158.2 KB Created: 2021-04-16 11:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 51de8cb312cc3d58b4c2e076c8cbec96 SHA-1: c016f1931a88bce4f97097962f01a3f8c7bb2ca4 SHA-256: f833b44c2fac2ff2e9b0ce439a916d662f3cbbf2f36e16bc9387986ff942f3b9
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains an embedded script and a suspicious URL, indicating an attempt to execute malicious code or redirect the user to a compromised site. The heuristic firings, particularly 'PDF_EMBEDDED_SCRIPT_PAYLOAD' and 'SE_LOLBIN_RUN_COMMAND', along with the ClamAV detection, strongly suggest malicious intent. The embedded script itself appears to be metadata rather than executable code, but the presence of the external URL and the overall context point to a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=windows+powershell+ise+x86+%25E9%2581%2595%25E3%2581%2584 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419415/normal_605fe20467675.pdfIn macro / runtime command snippet
    • https://cdn-cms.f-static.net/uploads/4374956/normal_602ca2a112d98.pdfIn PDF document text
    • https://mikuzowadakan.weebly.com/uploads/1/3/1/3/131383480/notode-kazem-pododifez-loniwadifiladi.pdfIn PDF document text
    • https://bafiredevidif.weebly.com/uploads/1/3/1/3/131384403/a46dcc8a30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500447/normal_60274d46f2de8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378393/normal_606e1e7869163.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374968/normal_6050db02a01ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413454/normal_603da62c8436a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475383/normal_60400a7992a1f.pdfIn PDF document text
    • https://mixozanuzobese.weebly.com/uploads/1/3/5/4/135400893/892eeda5c9467d.pdfIn PDF document text
    • https://molowusutet.weebly.com/uploads/1/3/1/3/131380828/zepixulidavekopajeme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462694/normal_60250b91e58e3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_fd3bfb2f927c46b09667e9aa8c082ec3.pdf?index=trueIn PDF document text
    • http://witibepav.rf.gd/libro_formulacion_y_evaluacion_de_proyectos_rafael_mendez.pdfIn PDF document text
    • http://beposutixavi.epizy.com/27637321884.pdfIn PDF document text
    • http://ziwutaje.epizy.com/92651165006.pdfIn PDF document text
    • https://441dbedc-201a-49d7-bb2a-292980023e2b.filesusr.com/ugd/473728_5aa6f6f542e14dba8c773a3d9453b154.pdf?index=trueIn PDF document text
    • https://07a38509-5a9d-4455-89b8-b0b93af23ef2.filesusr.com/ugd/f9d4cd_dd2cb4b53a6c439f96b688ca02bc8e9a.pdf?index=trueIn PDF document text
    • http://surobufalinaxis.epizy.com/budget_plan_report_sample.pdfIn PDF document text
    • http://sorajapiliwixod.rf.gd/wordscapes_answers_level_4010.pdfIn PDF document text
    • http://sedinuposib.rf.gd/oneplus_7_review_android_police.pdfIn PDF document text
    • http://gevosumol.epizy.com/the_breadwinner_book_trailer.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_00027279.bin pdf-embedded-script PDF raw stream script payload at offset 0x27279 1864 bytes
SHA-256: 262ab4062842aa462a83d6aef1da9b6183c0f662bb59c6aff2f48e6b37c135c1
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 5 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='Inkscape'>
<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>Suwoge Bocivo</rdf:li>
   </rdf:Seq>
  </dc:creator>
  <dc:description>
   <rdf:Alt>
    <rdf:li xml:lang='x-default'>Windows powershell ise x86 違い.   Windows 7以降のバージョンに標準搭載されているPowerShell。 コマンドプロンプトと比べて知名度があまり高くないため、最近その存在を知ったという人もいるでしょう。 PowerShel</rdf:li>
   </rdf:Alt>
  </dc:description>
  <dc:subject>
   <rdf:Bag>
    <rdf:li>Windows powershell ise x86 違い.   Windows 7以降のバージョンに標準搭載されているPowerShell。 コマンドプロンプトと比べて知名度があまり高くないため、最近その存在を知ったという人もいるでしょう。 PowerShel</rdf:li>
   </rdf:Bag>
  </dc:subject>
  <dc:title>
   <rdf:Alt>
    <rdf:li xml:lang='x-default'>Windows powershell ise x86 違い</rdf:li>
   </rdf:Alt>
  </dc:title>
 </rdf:Description>

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

 <rdf:Description rdf:about=''
  xmlns:xmp='http://ns.adobe.com/xap/1.0/'
  xmp:CreateDate='2020-09-05T12:18:16'
  xmp:CreatorTool='Inkscape'/>

 <rdf:Description rdf:about=''
  xmlns:xmpMM='http://ns.adobe.com/xap/1.0/mm/'
  xmpMM:DocumentID='a01d74c1-d0b4-4edf-803a-37e58c8f8f1c'
  xmpMM:InstanceID='9a59e9b2-fddf-4120-af9a-04a70e4813f2'/>

 <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_off0000f9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B4 100932 bytes
SHA-256: caa5f76e60aca73e9afa9cfb004c99af817b97f08a2e3b40623b8ec81235e09b
font_01_sfnt_off0002259d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2259D 3380 bytes
SHA-256: 2eabe2a74ce301b977bd5c6e1f935abb5cb82e4d256fdcb21d3972edd30d77c2
font_02_sfnt_off000231a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x231A0 5360 bytes
SHA-256: 2a847770799469fd4c6cd59608868704d284eeb1badcd602deb7b083025a3abc
font_03_sfnt_off000243f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x243F4 10436 bytes
SHA-256: 21bf1f3abc24508c04b547c1da148c4169de4c747c436b58c3bcaabda52f5700

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