Malicious PDF — malware analysis report

Static analysis result for SHA-256 06bc783053b37d42…

MALICIOUS

PDF

76.7 KB Created: 2021-09-16 21:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3ad84ed8d856857fba4a656927eb083f SHA-1: d713d1010c3667db50dd261d8ced59fddd4eec78 SHA-256: 06bc783053b37d423b17c81ca1c0ff58d6b404de77120a3a3a626e6ba0033d02
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external URIs, some of which are hosted on suspicious domains. Heuristics indicate a browser installation lure and a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of JavaScript to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://moraure.net/js/ckfinder/userfiles/files/26671179074.pdf In PDF document text
    • https://dichvuketoansg.com/luutru/files/xagupufupemogemuzajevure.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/1450042210.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/xavikawudedijazoluluri.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/lorolax.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/nitogudalositozisanajelo.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/sodovelakorogivoledewaw.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/75238561274.pdfIn PDF document text
    • http://boldogelet.hu/media/71359884047.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/xarixoxebutekiradatoto.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/wevirukijugebiloba.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/zonozipolasiriwanifo.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/94019982350.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/34972983976.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/47342991034.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/50055637880.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/59248326740.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/kewakugorafomajitewemabor.pdfIn PDF document text
    • http://thaoduoconline.com/userfiles/image/file/pizila.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/8961157786.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/nukojiwitifejav.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/zadipebi.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/85688558184.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/kerexofijaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=moto+face+unlock+apk+downloadPDF 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_off0000c67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67C 10524 bytes
SHA-256: 06bcb5b7e75c43e5c23c9b9dcc0abed0aa49170ca293f07c8758ae696f2ad3d3
font_01_sfnt_off0000dead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BF 17824 bytes
SHA-256: 8894c21b4b161402607b037ec2c2000e16d077bf085fbe15cf99fe4f429e8860