Malicious PDF — malware analysis report

Static analysis result for SHA-256 4615a9eecabc13fe…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 05:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 872a05c01709b683dd5c850905a8a28e SHA-1: da92d6eb2574c2cfb8a20463a7199e803b581788 SHA-256: 4615a9eecabc13fed1fecc4584f0848211e93b818b4635761550204e2c208d71
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to T1059.007, and the overall nature of the PDF suggests it was delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=rock+lee+shippuden PDF link annotation
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/4527013912.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/xutedezakatu.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/sofesudawi.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/6811420336.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/todenuzupeniwibativa.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/81237000194.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/vitovepavavota.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/jigusogesafel.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/26142893975.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/6563355228.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/53156030511.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/13008104271.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021091312483195.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/nigozugexavijitesujojusi.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16134740f3f4f3---10537868331.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b8b312ed6---15373334537.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/68946242076.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210917113412_542719878.pdfIn PDF document text
    • https://sadex.pl/fck/file/dotaxekuzoma.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/sufaserotarin.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/ranamolorapud.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/gefijikajatodom.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/66415627396.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7306564f2---xurabo.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/wovuleg.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_off0000dab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB7 10488 bytes
SHA-256: 4d8d67fb7b2f669044de95664056592976f459246a871b9e1cf5f7cf1d2c9708
font_01_sfnt_off0000f271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF271 19468 bytes
SHA-256: cb4c969fc0a4372c4203607de334cda614ffd62174de88339d58c859594be45b
font_02_sfnt_off000124f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1