Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb2fd2f06f912f83…

MALICIOUS

PDF

86.3 KB Created: 2021-09-21 03:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d13b0aede540d4ebc024d6628019c90e SHA-1: 00e0851b0d034506bf7e3443d246ec44cae8ec87 SHA-256: cb2fd2f06f912f831d89474ad6f8a0a4a890fe5b98e6cfb3f9d38373d6bce87b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The primary purpose appears to be directing users to a network of PDF files, potentially for SEO poisoning or to serve as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

Heuristics 5

  • 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.
  • 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://kadh.kr/bobod/upload/file/ranatozuvaxobanorisopuwa.pdf In PDF document text
    • https://bulendengin.com/upload/ckfinder/files/robapigagafamo.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/90965651041.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/zepupukajotopamotufapofub.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/7081154336.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/romup.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/78282180213.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/89288977820.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b66d25a818---6152420958.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/30402777300.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/witopezob.pdfIn PDF document text
    • https://laser123.com/geektic/files/5893196243.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210921_ACC9EFB59FE758B6.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/77201438498.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210909_B68950D521EB8B43.pdfIn PDF document text
    • http://twilaw.com/files/files/51649608396.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369d4e2a702---77715783888.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/55655438895.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/xisivitamox.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210905112844.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/niraliluravebip.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/gabokosisewerewefubuxukid.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/puzapigedipedelediduzuk.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/2393395057.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/52432850927.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/voretedijiwixudisuviside.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/11388458895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=taiwan+live+tv+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE302 10064 bytes
SHA-256: a007c26d447e411af43c08e8b7a4ca9b98a33d07b4e80f5b5446642b9664c781
font_02_sfnt_off0000f98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98D 23164 bytes
SHA-256: f6da8d8ad085f4394510ab596cb0d4b1aac21e2a2776c240edc6ef37bc728b9b
font_03_sfnt_off00013545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13545 16160 bytes
SHA-256: fa5cbea137587b1d4bb1c548ff3f8d17a18587fe273de630a8d80f12e69f99e4