Malicious PDF — malware analysis report

Static analysis result for SHA-256 3175cecff6f8ee7a…

MALICIOUS

PDF

83.7 KB Created: 2021-10-10 01:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1afa32ca9525bcb55a0930be13b75eda SHA-1: a728214f7a22ca77c535e3fa9574384ed565ac67 SHA-256: 3175cecff6f8ee7a611ce1a5dbcb0e738b0d1cc05ed9a8cf6eb113b4d313c3ec
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to one of the numerous external URLs found in the document, which are often used for phishing or to download further malicious payloads. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://ketchas.ru/uplcv?utm_term=introduce+yourself+sample+for+experienced PDF link annotation
    • http://tnslib.tools/userfiles/files/82905831496.pdfIn PDF document text
    • http://ocung.net/img/files/50415238002.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/terabutasup.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/72956257539.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/rogiperunire.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/titid.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/manalepaziseliju.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/fagisusunuveruwom.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abbd14a234---pewojelumigo.pdfIn PDF document text
    • http://agama-rc.com/upload/files/borupujisop.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/pugewipumewezunexa.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/mitejedamawugarisow.pdfIn PDF document text
    • https://hojoairport.com/images/file/73799102207.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/palepojilipotokejosi.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/73468675188.pdfIn PDF document text
    • https://masukpt2.com/contents/files/madogefala.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/74175280922.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/31539222746.pdfIn PDF document text
    • http://metapolar.hu/tmp/gukiwilofap.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/roviwabotuna.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/30704642400.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/12974457072.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/joxudotarejam.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/0de1nf61f0jlf6jvlp55kribn6nr57cf/23216057663.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/pasodenaferesapagigu.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/95555218672.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/foteloriwodokum.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_off0000de8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8D 18624 bytes
SHA-256: 7135e82acd1fd595a73cbbf7e7b98da02298b4a8c5c1b1b40bbaccea94b34d11
font_01_sfnt_off00010e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A3 11048 bytes
SHA-256: 34e34c59d7228d9348d3b8bf9ee6c66803193cc46395bd6296bde01bbf70667a