Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf48d171f3cf478b…

MALICIOUS

PDF

81.4 KB Created: 2021-09-14 02:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b2f90f9a4c3a24c0653207a2ecb1736 SHA-1: be6cd151c33abcae851ae62805b37a092542e802 SHA-256: bf48d171f3cf478b7e8cfc5a222a5404fd8f67163412a340906522dd6b80b6fc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, with a high risk score. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a deceptive web presence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/topasopilemuzebupob.pdf In PDF document text
    • http://stromzeleny.cz/file/ravagupetezak.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/sitonuwipinisobitev.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/88568080270.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109111547428410.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/loxubosevafip.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391693c5e7b---33715556036.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/sigakal.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/guxijizedeluzabowitise.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/jedegapejipaxikapozuzexa.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/10243073883.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/57625701220.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/nakepake.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/95821451084.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/95928515382.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/20271877831.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/bifodazuwebirisufap.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/fobodukuvo.pdfIn PDF document text
    • http://thongthien.vn/upload/files/simaminugojimiwe.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/wotan.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7b897a908---pufasodevogedejagurufi.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/nudolobilo.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210912102827.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/11893783560.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/97058517993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=airplay+screen+mirroring+androidPDF 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_off0000d73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4E 18136 bytes
SHA-256: 377250a69972045aaf3a5dd2739f2b16354e4ae9ec9d85123a012a30133fede4
font_02_sfnt_off00011ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC6 10852 bytes
SHA-256: cf24e28a4557bdc4ed4867e9f6d63256d55376e99e2886f9397cf746b566fb71