Malicious PDF — malware analysis report

Static analysis result for SHA-256 e167edbc2a3c8bb3…

MALICIOUS

PDF

76.2 KB Created: 2021-09-19 07:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b22becd6fca9b854076765d74f374a2d SHA-1: feca240a46f57ea16d12a718e4f2395e762487a2 SHA-256: e167edbc2a3c8bb3985370954dddf931b683cc5a8dd65724c0dcb1928d7dd79d
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a large number of links, likely for phishing or malware distribution. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7562

Heuristics 5

  • 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
  • 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://archism.ru/uplcv?utm_term=macbook+air+live+wallpaper PDF link annotation
    • http://sziszolg.hu/editor_up/89820019125.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/09/file/202109041838551920.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/fokofiguwozazewu.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/lusokanususe.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/27349230352.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/45347193033.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/44603057997.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/zeroziba.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/jisesajedogalenexer.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/siwofotedik.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/vatetekilor.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210905_6C7E9A0C4A08495F.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/mufutazevisenogunala.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/dodujizaxujizenokagunor.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/mupubojomu.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/febirabuwolinar.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/wumujosozoxiwebudisubuk.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/somizozelew.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/tinav.pdfIn PDF document text
    • https://gencatakan.com/upload/file/tazuwisolakix.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/pukulumudebilulip.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/15581877836.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/59690376d83399c8496628f10f2ef244/1207552926.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/49666525815.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5A 10372 bytes
SHA-256: 0fc2f9edf076769301cad877be44cebd7e9e4aadffc856f865ad071b7f03b4d1

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