Malicious PDF — malware analysis report

Static analysis result for SHA-256 16891d502c8f130b…

MALICIOUS

PDF

79.0 KB Created: 2021-03-31 12:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 85c4c2ce4d7f572020260ee8ca02ce62 SHA-1: 80c9de0a16cf0b843de5a3b283ebdaa0207f9262 SHA-256: 16891d502c8f130be26822337251feebf63a9477ea9c75d661a96651ef2dcfe8
256 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and numerous external links, many of which are part of a link farm. The presence of a PDF_EMBEDDED_SCRIPT_PAYLOAD heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent. The embedded script and the nature of the URLs suggest an attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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.
  • 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://gimoguvi.ru/strik?utm_term=learn+windows+powershell+in+a+month+of+lunches+3rd+edition PDF link annotation
    • https://melijezaziwoni.weebly.com/uploads/1/3/4/8/134851492/3962068.pdfIn PDF document text
    • http://jabisoj.22web.org/pozulitakabun.pdfIn macro / runtime command snippet
    • http://xujavimok.22web.org/tumosado.pdfIn PDF document text
    • https://musokolej.weebly.com/uploads/1/3/1/3/131383826/2439140.pdfIn PDF document text
    • http://pokulumaj.iblogger.org/eureka_enviro_steamer_pads_60675.pdfIn PDF document text
    • http://mizikekow.22web.org/84678495320.pdfIn PDF document text
    • https://xosovixa.weebly.com/uploads/1/3/4/3/134318585/tuxifavelukipib.pdfIn PDF document text
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/navezad-rirux-waramorebare-lilavumokajix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sajezife/bhajana_patalu_telugu_lo_ing.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/gosete/presentacion_power_point_los_7_habitos_de_la_gente_altamente_efectiva.pdfIn PDF document text
    • http://dodarululi.epizy.com/rijulavelifi.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/aus_email_erstellen.pdfIn PDF document text
    • http://mulisemovilunud.epizy.com/bachelor_degree_with_honours_short_form.pdfIn PDF document text
    • http://dufosulux.epizy.com/xeripaxuvibik.pdfIn PDF document text
    • http://fovopokam.epizy.com/tekapukepurupazifuwejuvir.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/ejemplos_cotidianos_de_movimiento_rectilineo_uniforme_variado.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/11780822934.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/73238604014.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_0001363e.bin pdf-embedded-script PDF raw stream script payload at offset 0x1363E 1671 bytes
SHA-256: 64d889040512c587f7ca499b88f912ac5edd2f162de5d8aee8594465c627c4e5
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='pstoedit'>
<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>Yunobami Dikuxute</rdf:li>
   </rdf:Seq>
  </dc:creator>
  <dc:description>
   <rdf:Alt>
    <rdf:li xml:lang='x-default'>Learn windows powershell in a month of lunches 3rd edition.   Hey all, I am Andreas Schubert and I am working as a Principal Consultant and Database Reliability</rdf:li>
   </rdf:Alt>
  </dc:description>
  <dc:subject>
   <rdf:Bag>
    <rdf:li>Learn windows powershell in a month of lunches 3rd edition.   Hey all, I am Andreas Schubert and I am working as a Principal Consultant and Database Reliability</rdf:li>
   </rdf:Bag>
  </dc:subject>
  <dc:title>
   <rdf:Alt>
    <rdf:li xml:lang='x-default'>Learn windows powershell in a month of lunches 3rd edition</rdf:li>
   </rdf:Alt>
  </dc:title>
 </rdf:Description>

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

 <rdf:Description rdf:about=''
  xmlns:xmp='http://ns.adobe.com/xap/1.0/'
  xmp:CreateDate='2020-09-23T06:13:45'
  xmp:CreatorTool='pstoedit'/>

 <rdf:Description rdf:about=''
  xmlns:xmpMM='http://ns.adobe.com/xap/1.0/mm/'
  xmpMM:DocumentID='9caed291-d96d-4504-acdd-5607e8a1d8c3'
  xmpMM:InstanceID='b3f1e980-c467-4afb-83cf-3414e8cc15b6'/>

 <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_off0000f116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF116 5592 bytes
SHA-256: ecf5e616e7a50e90fb5873d142a956399dc37d03718449288413c3cf50ee6252
font_01_sfnt_off0001040d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040D 12452 bytes
SHA-256: 87e86bac0035eb96137a0980a8043fd01ff4beb005e092587316bf870817190c

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