Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5c30b7e796701c…

MALICIOUS

PDF

79.0 KB Created: 2021-09-12 20:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d9a9f60b2181d8b2551c1f24889fc995 SHA-1: 500604f5986de31709f1ddd54ff67dc16ccaa772 SHA-256: bc5c30b7e796701c0dbd622f31c6e6232efc382786cf2113d4415bf26b4e71f6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to one of the numerous external URLs found in the document, which are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.
  • 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 http://sklepjola.pl/userfiles/file/danogowezebexidumag.pdf In PDF document text
    • http://gramercy-grand.ru/files/file/xenojepet.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/sadewigapi.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/3265619653.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/44649859186.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/xugagekikiwopivufe.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/c335cfa7aa41055958270ef7203d3772/13274170049.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/30b7468633a1217f374ccfc7936fb1f4/lodonebunanoruxuwirazez.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/31324947446.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94466803866.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/56027757342.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/gegemerebap.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/84993654125.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/rigovomuwesidewumajov.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/jegowuniwi.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/bomapupixepa.pdfIn PDF document text
    • http://93564497.com/userfiles/21877542803.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/17771554649.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210901112946.pdfIn PDF document text
    • https://themalc.org/files/file/93869569957.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/6588984099.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/4062208007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=mixgram+free+downloadPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD127 17244 bytes
SHA-256: eaa3ec1895d74dab3cb2705f60f6401cdb88225ac241ca84dfec5e9202f91ceb
font_01_sfnt_off0000fe77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE77 10612 bytes
SHA-256: 5d5f6926874898ec2dd9bd0acc02a94c6f7b1d904d7fce7ac02dd943ef0b6918
font_02_sfnt_off0001168a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1