Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc36938fca0333b…

MALICIOUS

PDF

69.7 KB Created: 2021-09-19 08:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 439c0a4c7922f20abd1885ef8e460a53 SHA-1: e66dd532f34851fbb87d559498d23d3c8045c14c SHA-256: 9bc36938fca0333bdcb223af91dd59f868fa33697820517be134c11993bede8f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to deliver malicious content. The PDF structure and embedded links indicate an attempt to trick users into visiting potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • 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://gallery4walls.com/upload/editer/file/sidafe.pdf In PDF document text
    • https://leifs-auto.dk/images/file/dapavunevibadileduzoba.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/14931412595.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/repodidijazok.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/82384157386.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/fexobademenil.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/foravefalafavis.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/labakiruzinijezubitif.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/ponitekipanolibubasorek.pdfIn PDF document text
    • https://khanikango.in/file/92050237644.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/47440024420.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/regoposozinaruju.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/4620364175.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/fireliromumemukesekoxi.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/20744135087.pdfIn PDF document text
    • http://nyt.jp/p_images/resource_library/file/17469286166.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/b0f6b1b6171f7f02566ba630464d907b/zotanomejow.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/ponor.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/54435546495.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/bukipudafu.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/19635646115.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ride2i5jf0sa3g2rg3atlc2qq9/mojelokeziropites.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=amazon+prime+mod+latestPDF 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_off0000b2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F6 10596 bytes
SHA-256: 52bc77ccae15c537ad1616547afea3dcf4fae6daa376f7fca4c244fc9caf6c44
font_01_sfnt_off0000cb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB26 15236 bytes
SHA-256: bf14387ca87661730855f3d17fd8c2c1bc2bfd294860f73ccbba43b13baf8756
font_02_sfnt_off0000f18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1