Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb92f8295e9e11a…

MALICIOUS

PDF

85.5 KB Created: 2021-09-23 20:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 13989b4725a4a0c756bb31d21651f03b SHA-1: 8218f0094a82d98c4678c8406ab0f984a66b7bdf SHA-256: cfb92f8295e9e11ad480e4cc6e6f5f1e2093cdb3d8769c1cbac177cdfc9d0469
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, indicating an attempt to redirect the user to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the URL 'https://pistant.ru/uplcv?utm_term=outlook+2019+activator' suggest a lure related to software activation or phishing. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://pistant.ru/uplcv?utm_term=outlook+2019+activator PDF link annotation
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/dd0c627fb5a8e28ec1b838b61435dc43/buvuzar.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/zejapepukolorufu.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/89821842853.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/rarawolofeburusivorefe.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/67559070629.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/70999789582.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/womudepugekufipopipitevu.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efb539a6d8---lefejuvipebewix.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/mawog.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/62077110448.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/94500666218.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/20603589524.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/56438122032.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/67047563943.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/33150236073.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/25942154705.pdfIn PDF document text
    • http://sql110.com/pic/xadajexaxogarikivedipaf.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92911431383.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/xipozoloxosiwosolal.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/70718891870.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/31084078411.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/wupetujapuxisadogijoxo.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/pawidizofubifu.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/27316919544.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/11678998363.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/88570713466.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/favusareviwiwosaju.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_off0000e984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE984 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10196 17748 bytes
SHA-256: d8edf131dd94284d8b7002b8692b6eceaa3b8fded91d3dded1dff9375e3f7486
font_02_sfnt_off00012f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F67 10564 bytes
SHA-256: feb511901218be7c37ae1b43be1df0b8c82ae3e7e428616a0a96119fae9b166b