Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a8d85d34eb8492…

MALICIOUS

PDF

81.7 KB Created: 2021-09-11 19:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cc9345b1bff85dea583f08639238a982 SHA-1: 958da56bc6f5cf153790116fb0a8051721f32e76 SHA-256: d9a8d85d34eb8492002d7ae4cec8cb849dc03a64843b7fdfae057eb29220ca9b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an initial access vector via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://coyada.com/up_images/up_images/nevoro.pdf In PDF document text
    • http://effekt-film.de/files/file/xizavajosogoki.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/89894154787.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dagufukujerizilo.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/pejupufegu.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-6/20210906053507838775.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/77289257047.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/xemun.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/12244994513.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/mevaloxajejuradatisodit.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/zadupikebex.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/42612363748.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/06/fabubeziki.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/tegalixan.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/29326386286.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/bexotiz.pdfIn PDF document text
    • http://iucecb.com/files/file/30715754348.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/52084388468.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc6e3843a9---ridijazejutafebadaguwogob.pdfIn PDF document text
    • https://seerupit.dk/assens/file/zatejogumokora.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/kazixeloropunerobitumulo.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/gigifozadusabarot.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/90802531897.pdfIn PDF document text
    • https://strechybenesov.cz/content/62298987655.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/jagijimaniwirefaziwodefu.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/2089647578613867007caaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=watch+the+vampire+diaries+season+4+online+freePDF 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_off0000dbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E6 11024 bytes
SHA-256: 610e3305cd278f35338fe064c5e5ef39871a17b374d423da2ca1d5128126c3b4
font_02_sfnt_off00010d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D64 16676 bytes
SHA-256: f3bafdc9cf19cd1381ee2e0764f0bb778b9f22db6d4e8a9d285c1a15b222efd3