Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4dbee7ae1466444…

MALICIOUS

PDF

74.0 KB Created: 2021-09-20 17:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 827c9704b16c184026ee4a29f0534128 SHA-1: 86554aa46bfb321cb0e049befd70a04a6214ff08 SHA-256: b4dbee7ae14664445687887fac9395a6b8209c638eebb576787de23ae752a4ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • 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://smidgel.ru/uplcv?utm_term=xlx+to+pdf+converter PDF link annotation
    • https://ud-hobby.com/images/Upload/file/2454771681.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613251991a1f4---51319373345.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/16304796261.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/sabuwexuwozosovalujibil.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/89397283781.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/mijogokinus.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/66745345194.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/wenajiviradexepaneporuju.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/logorapigurevakugo.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/94220986429.pdfIn PDF document text
    • https://ip-pharma.net/data/files/27848161696.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/66953459295.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/vonabumowomotile.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210918_181909_143.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/94998903370.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/37338129493.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/lbnij33hbhnfep3tangt9hta96/4487137325.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/situsamox.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/37173368494.pdfIn PDF document text
    • http://nenorm.com/files/files/7480606179.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/26275570080.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/61047428428.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/nufavidikotuzoxonomewubix.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/zokaweboxojonovivir.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_off0000c0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F3 16396 bytes
SHA-256: 046ac9a63e3d4acd65702bd9e026195b59c57b3a74fdaf23ffefe54c9bdae715
font_01_sfnt_off0000eae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FC 10364 bytes
SHA-256: 99ef5cb5c9b03958839d39c3248446606e7f5dbd333fc6518b94b090bbebd751