Malicious PDF — malware analysis report

Static analysis result for SHA-256 e541fd3091fc0911…

MALICIOUS

PDF

83.6 KB Created: 2021-09-10 12:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aa6bb8c693ab1fafec441d2b32ba80e6 SHA-1: 02d556e6ecc6ffa11fb648246212c21ac5fc5f76 SHA-256: e541fd3091fc09112a39cb06f47ecb13cd719dbd76a6c92aa48117703f70aa29
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://garglob.ru/uplcv?utm_term=the+kissing+booth+2018+full+movie+free+download+with+english+subtitles PDF link annotation
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/4ff3a8f52c45841f9e948b7bf472b57f/58000766855.pdfIn PDF document text
    • http://belovosushi.ru/files/lafixuwiduvab.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/zevibowivizeduk.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/vesapepajirewa.pdfIn PDF document text
    • http://lagrupacio.cat/file/powom.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/fonokimetudijubakaja.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/wekuvaxogoximelebiw.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/dujogepazogafunobizow.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/31214178059.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/navopozot.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/22312271389.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/27246451598.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/6366721161.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/66944939142.pdfIn PDF document text
    • http://metabolit.ru/files/file/68331404453.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/biximawodatizaja.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/xibafof.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/4190360566.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f570e63e22---bokiwafixesat.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/10285442234.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/vudazigaminimepijaso.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26822807980.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/lavivaxabolekuliligezow.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/punawizajinakijadaw.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_off0000dbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFC 11752 bytes
SHA-256: d2a71975c2b2dac51571496e11728558fd668bdaab8168c675214d46d34c643a
font_01_sfnt_off0000f7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE0 18984 bytes
SHA-256: ee59c8d5e7536a60ab54d3da7e8b7797642305949f93758fdf2afdd6f7d6c36c