Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44187c770b46bb9…

MALICIOUS

PDF

122.5 KB Created: 2021-09-17 08:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 24c0df9c6c0272a13446888876928623 SHA-1: 15bfcfecd5e1d219a51655ad197186bae9f001f6 SHA-256: b44187c770b46bb92fa227c18f998bafe7daf87b6ae1fb2043af89454cf5c3c8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous external URLs suggest a phishing or link-farming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://pixomot.ru/uplcv?utm_term=market+android+giochi+gratis+da+scaricare PDF link annotation
    • http://bienbao.org/uploads/files/17219668535.pdfIn PDF document text
    • https://olterus.info/contents/files/49022159726.pdfIn PDF document text
    • https://bczenekar.hu/files/file/midofenevujuli.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/13728544191.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/mevul.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/74784871713.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/74143013623.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/56587418356.pdfIn PDF document text
    • http://asustainable.com/global/file/13530704092.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/fudivobexopepumegiwopage.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/12399479671.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/8jkvdghedl6hsk8ub4sahhiv43/werikiwaxagat.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/sewokipuliboxuvuto.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/75907339229.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aca71c7d18---67429625893.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/jupamedukewomuk1631479827.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/44337466811.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/zavopovaxosevabigum.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/58837080579.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/812894867.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/43708684912.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/ladimu.pdfIn PDF document text
    • http://szpk.hu/_user/file/didijuto.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-17/images/files/lajixexewin.pdfIn PDF document text
    • 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_off00017b82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19399 10688 bytes
SHA-256: 3ec05445231bc391b1da3c351bd573007753930819e87c6136a32ebdec3f363b
font_02_sfnt_off0001abd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABD6 18280 bytes
SHA-256: 9a3fe99200b2242074619e40eb55c951ca07b42061ef20bdaeaa96d1e89bb9e1