Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4ceeb0685ed944…

MALICIOUS

PDF

78.9 KB Created: 2021-03-11 13:36:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 07d2028a4d39883f29d698a873a9dbea SHA-1: 01875f404dc0423f8cfd45b267504c2f3035ad78 SHA-256: fc4ceeb0685ed94449dd55dc69f958de0861f14fce93a2204e1d7db627a86087
216 Risk Score

Malware Insights

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

The PDF contains embedded script and numerous external links, including a link farm heuristic, suggesting a malicious intent to redirect users or host further malicious content. The embedded script itself is XMP metadata and does not contain executable code, but the presence of PDF_EMBEDDED_SCRIPT_PAYLOAD and PDF_SEO_LINK_FARM heuristics, along with ClamAV detection, strongly indicates malicious activity. The primary attack vector appears to be a phishing attachment, with the embedded script and links serving as components of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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 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.
  • 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://fokemale.ru/aws?utm_term=windows+terminal+powershell+starting+directory PDF link annotation
    • https://xemubafuwifo.weebly.com/uploads/1/3/4/4/134475424/3019384.pdfIn PDF document text
    • https://javufivupa.weebly.com/uploads/1/3/4/3/134349262/9062887.pdfIn PDF document text
    • http://juvugewit.iblogger.org/what_oil_does_a_dodge_durango_take.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387419/normal_5fdec8b636cf5.pdfIn PDF document text
    • http://nitalesilafatem.22web.org/4968191059.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375890/normal_60240aacb69b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477181/normal_5fdacbf9b0843.pdfIn PDF document text
    • http://wawogofofun.iblogger.org/brodski_dnevnik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d921397d-3813-4479-8f1a-6e0644ebfe3a/abu_garcia_black_max_reel_review.pdfIn PDF document text
    • http://jefevuxivux.epizy.com/orissa_human_development_report_2011.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/android_navigation_drawer_hamburger_icon_not_showing.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/reducing_fractions_worksheets_6th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/interview_questions_for_administrative_secretary_position.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/2020_bmw_z4_m40i_performance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e384b1b-b1ce-43de-a18b-ac473b3e8a6e/experience_and_education_john_dewey_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feaf8003-5a23-4ba5-bac1-a4da2c734128/67289138837.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/katikati_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/xilebenitamimu.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/96005491191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bce4cc88-3684-497a-8970-f944a171d356/rupozusuxazij.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_0001360e.bin pdf-embedded-script PDF raw stream script payload at offset 0x1360E 1661 bytes
SHA-256: 0405aba386573631bc1fe2c462f139c0b397e8f6a321106c96b182f50e9b2215
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='Mobipocket Creator'>
<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>Vijanu Buxuvi</rdf:li>
   </rdf:Seq>
  </dc:creator>
  <dc:description>
   <rdf:Alt>
    <rdf:li xml:lang='x-default'>Windows terminal powershell starting directory. This is a problem that is raised on the GitHub page of Microsoft Terminal in windows terminal as the</rdf:li>
   </rdf:Alt>
  </dc:description>
  <dc:subject>
   <rdf:Bag>
    <rdf:li>Windows terminal powershell starting directory. This is a problem that is raised on the GitHub page of Microsoft Terminal in windows terminal as the</rdf:li>
   </rdf:Bag>
  </dc:subject>
  <dc:title>
   <rdf:Alt>
    <rdf:li xml:lang='x-default'>Windows terminal powershell starting directory</rdf:li>
   </rdf:Alt>
  </dc:title>
 </rdf:Description>

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

 <rdf:Description rdf:about=''
  xmlns:xmp='http://ns.adobe.com/xap/1.0/'
  xmp:CreateDate='2020-03-08T11:10:41'
  xmp:CreatorTool='Mobipocket Creator'/>

 <rdf:Description rdf:about=''
  xmlns:xmpMM='http://ns.adobe.com/xap/1.0/mm/'
  xmpMM:DocumentID='51ac25c8-670a-405b-a660-612e49f3abb0'
  xmpMM:InstanceID='665078a5-eea1-41af-9f1b-63d7eb30d960'/>

 <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_off0000d082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD082 5484 bytes
SHA-256: cacf8200acb61c6cd125f14f1cc384be4b072f0d7c61bcb5ebc3211b86ac45d8
font_01_sfnt_off0000e30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30E 11288 bytes
SHA-256: f4faba4c3a06672b748ba6ad30271c04d689e12a38e6a6c7c6011479890cc266
font_02_sfnt_off000109da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DA 16352 bytes
SHA-256: 867fd276a12397c4e9cf6579dce5e07e5ba80c6769d60c08053fe2abc7b8f701
font_03_sfnt_off00011f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F64 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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