Malicious PDF — malware analysis report

Static analysis result for SHA-256 018fe89022efd318…

MALICIOUS

PDF

86.2 KB Created: 2021-09-09 02:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a4373faaba0f858831d870c3b8a16c01 SHA-1: bf7b18d40790fd47222f5cd7f4df76446a5d50aa SHA-256: 018fe89022efd318b2b660c41819183381d061f84fffca51d67ce75fd052eb79
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The PDF structure and embedded links suggest an attempt to redirect users to potentially malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://smirna.pl/files/file/musegosiwa.pdf In PDF document text
    • http://thepnguyentran.com/media/ftp/file/95611302309.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/gufixekebijelelow.pdfIn PDF document text
    • http://gotween.com/userfiles/file///fanivitopit.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161392c499a1b2---vuwabaforiju.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/zerejib.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbc831bfe2---30747236131.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/68332876667.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/2199089887.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/35556797499.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/fitafo.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/5417086684.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/ginanafexakeputulewagolak.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/wemikedofitijutow.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/rajadebesoxejafi.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/majalubafetasuwatarilufed.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/60436284732.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/5841656217.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210907152347.pdfIn PDF document text
    • http://chinazzjx.com/d/files/81004426827.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/63799923119.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/66402275234.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=watch+ggg+fight+onlinePDF 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_off0000ec20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC20 10340 bytes
SHA-256: 73177a90887555bdfb9e031c2a5deadf5eed263e2553a6bfd6b49c8c3189c061
font_01_sfnt_off00010370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10370 18672 bytes
SHA-256: 5bf0d2f07c844cbe7a8227f2300e2414f4dbbce9a2bdaf81c47a539ac75f2d74
font_02_sfnt_off000133be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1