Malicious PDF — malware analysis report

Static analysis result for SHA-256 753bc07037f5b6ad…

MALICIOUS

PDF

83.4 KB Created: 2021-09-18 22:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d3976f280f73bc0339ea01001d416f7a SHA-1: 6a1cf84174e33103fef8429406fd15fd5e23829d SHA-256: 753bc07037f5b6adc398a1985cfe8ee776039c3d469f35455d01415423261ebd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links, many pointing to unknown domains, suggesting a link farm designed to redirect users to potentially harmful sites. The presence of embedded JavaScript further supports the malicious nature, likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/rasukefadupaxuzizuvidok.pdf In PDF document text
    • https://floridahouselottery.com/test/userfiles/file/91692667973.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b496ffbfbdf566bb0d26ce667c209e5a/jukuvajuko.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/47959040093.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/37907292519.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/dilebiberoremoxujadupo.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/seleviritamukopatibup.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/61402950693.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/67415454047.pdfIn PDF document text
    • https://totounited.com/contents/files/rufokazezud.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/zolokakemukopodu.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/21222410275.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/82246839954.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/15072544573.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/nijunexesagimefijozadag.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65242590462.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/22341931594.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/xaxidadovavenil.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109070542408407.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/vipikevutogaliz.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fde36079db---zodoxojakekarola.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/gozixoxo.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/pepufibesokakawituju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=i+can+watch+a+moviePDF 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_off0000e0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F9 18404 bytes
SHA-256: e7f596b32ed98856e3e9af2682a6f02e462aa40d2d3d59db71a5d51164788f63
font_01_sfnt_off000110e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E3 10284 bytes
SHA-256: bd198d03add47de19ad8ba9782b520c69e30cb4da2f6214c682539eb39c7993a
font_02_sfnt_off000127ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1