Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49d695aea7dbd48…

MALICIOUS

PDF

93.6 KB Created: 2021-09-09 18:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e4da87ca334f5bdea9cd0f76af64377c SHA-1: 2d02cdc784f0be7d70122fa9f6896463efdc1ae3 SHA-256: b49d695aea7dbd4804e381d3d11a7409d7ed8a36c94c93b559a977be65d37d41
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple disposable hosts and UTM parameters in some URLs further supports a campaign aimed at user deception.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://nhagiatxanh.com/public/default/ckeditor/files/66606627887.pdf In PDF document text
    • https://aaaxxion.info/images/file/93349042876.pdfIn PDF document text
    • http://brlairport.com/images/file/dovoguwifuwiwupoxufibamed.pdfIn PDF document text
    • https://bawauang.com/contents/files/loxaladoki.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/sudawujewiwilokeden.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/vavegewukupubefu.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/jitobuzuzazonozukovuwiz.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/bepabikin.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/81018715783.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/verir.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/dawujibajenemelivobo.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/vagepenebijafagujaker.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/54515185709.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131710b6d666---98581643600.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/xejologusogo.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210903015107.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/62636834493.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/12975409343.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/65287733092.pdfIn PDF document text
    • http://melabo.com/upload/files/rutetuvumoxujosufelixagoz.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///8089630902.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33267198116.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/ravedenebeboriwu.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/junojub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=talking+droid+original+version+apkPDF 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_off0000fec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D7 10592 bytes
SHA-256: 6c365723de1aa6c86e6a28d0141c24bb4f1db8d5d90d4aaf32e932020bedce31
font_02_sfnt_off00012ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE9 21704 bytes
SHA-256: dab8336aff2096d61623bc30a9e7aa265c57b243a9b4afc0d3a3fcd328dcebbf