Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cbc33aab4bc20ac…

MALICIOUS

PDF

68.2 KB Created: 2021-09-28 15:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4041c12539b3a80a33254ecfeee1709f SHA-1: 9c49528a2850154a23f93c3334a97ec3a284ff86 SHA-256: 6cbc33aab4bc20ac5749ed815b869039ea29de426c60d5aa5c29d5062977f2ae
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It employs an image-only lure, typical of phishing, to trick users into clicking a link that leads to a malicious PDF. Embedded JavaScript is present, likely used to facilitate the download or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/fapidi.pdf In PDF document text
    • http://rc-modeller.se/images/file///xabazuzejomukeleditagafek.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/palulujupojamani.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/ralose.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/78671640595.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/suromakimuzifevezupoj.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/13574162782.pdfIn PDF document text
    • http://moje-stranky.eu/userfiles/file/rogur.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/dibidonudubovu.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/dunazoj.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/fesube.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/99914641151.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cba4692955---sejikidas.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/nilur.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/62001107020.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/xejawogarivifipigesebup.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/35687623820.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/42710215020.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/19061188793.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/36352452712.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/62720629576.pdfIn PDF document text
    • https://emenu.hu/editor_up/dekuvimeserazazez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+change+the+ringtone+on+my+phonePDF 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_off0000aee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE2 10796 bytes
SHA-256: a29deace62ab715d852f89397b9d2c93db263f7fe0f89a56c293b27fe3baf46e
font_01_sfnt_off0000c799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC799 14172 bytes
SHA-256: 6d2dce5931e98fd52a9749dd35a39e073effc59c40c372ae008aa66796fe7b09
font_02_sfnt_off0000eae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1