Malicious PDF — malware analysis report

Static analysis result for SHA-256 ced5bd9771ee7bca…

MALICIOUS

PDF

71.4 KB Created: 2021-09-16 11:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aa9adcbde0946609b5439dcf35c51683 SHA-1: 9e8791b37393b4ec4a402f47cadfbf854189df8c SHA-256: ced5bd9771ee7bca912b8ef919cc6dc2a651e79a1f7c9a708eb4105e074b9daf
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and heuristics indicate it is designed as a phishing lure, specifically using a download button and password protection instructions to trick the user. The embedded JavaScript and numerous external links, including one to 'master-br.ru', suggest an attempt to deliver a secondary payload. The ClamAV detection further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://master-br.ru/img/file/bujaferiwugo.pdf In PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613984b953911---vusedukimukedalowaziwa.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/21211822142.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/23690407583.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/4638093983.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/72241968595.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/56620997248.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/vapujuga.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613698507d0c2---rusurazidafevi.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45637843420.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/mubanirudapipowijapegid.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/50412156394.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/18559281242.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/demebovujenosarebabifa.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/dijunitegatevesoma.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/diledutebutoxusapexumo.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/74513573794.pdfIn PDF document text
    • https://phukienbep.net/media/files/xasukovesogobijudaki.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/54959239120.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/xogixilerewetujagabamasof.pdfIn PDF document text
    • https://mackbeks.com/files/file/temitisegixigijofipofob.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/wumogunugezumuzamiluror.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/mafotowesiguroreke.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dubisanojabuwa.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/91743456126.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=download+pattern+password+disablePDF 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_off0000b52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB52D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD44 10612 bytes
SHA-256: 4c89258e23be763d1af8a017f2948d0e05e2e49955d7fa82d125a0d04c8dcd5c
font_02_sfnt_off0000e570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE570 16580 bytes
SHA-256: cf92c940a140bebcb06dd26a73f443aa5636793268b4e7fd8d1de1704a3afdf0

Open this report in the interactive analyzer, or submit your own file for analysis.