Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e2c840d9590e97f…

MALICIOUS

PDF

82.2 KB Created: 2021-09-11 11:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f738cdcb93edb7fe1c21db47dfb38d8e SHA-1: 0f56d6ed43e0f2dcd77a3327b3d830a8b6a071be SHA-256: 0e2c840d9590e97fb8cad2d9319225f4a48c26286f4c60680c7f58140194c900
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs pointing to external websites, with several heuristics indicating it functions as a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is weaponized to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://nomylo.ru/uplcv?utm_term=eat+out+phrasal+verb+meaning PDF link annotation
    • http://nprofit.hk/userfiles/91427005448.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/95903370699.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/60102286265.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/70234124002.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/wimuvafisibefixogifuvu.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/toxizogusafobamunenaw.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/sapilagokojaf.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/wowedegifokipukefej.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/86144898945.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/gawosafutid.pdfIn PDF document text
    • https://sealskinz.ru/files/file/tasozaso.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/zutuzewafagajan.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130516e24bc9---xevupojujadokazojisewiwab.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/41799396997.pdfIn PDF document text
    • http://gibisch.biz/files/files/2039248103.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/33947161978.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/wozefuwupofitiji.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/darakenapiparubajizur.pdfPDF link annotation
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3e0b184ca372192c4ae620f1553e7c63/36209974988.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613c02c66268f---nafojatokekugosevojin.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/bexotolitedamexoxuxulok.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/xubesiduforofuzigori.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/resikopatabewen.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_off0000d6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECB 10988 bytes
SHA-256: 7a3dc1fde8b1cd9d12f684b8c9498be159439aaa61711a0843bd8f1537b8cfea
font_02_sfnt_off000107ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EC 19776 bytes
SHA-256: 12497da4ecf33addc1f23b7fd61f626330c344af954f955294f300e2cf34f619