Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8500492f935dac0…

MALICIOUS

PDF

72.0 KB Created: 2021-10-03 04:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8742bbbc60e9164054c4e900800d03cd SHA-1: 4eb9c34fbd58b08c07b7c1eac28d3a32e2390915 SHA-256: d8500492f935dac061c310048287419b4f4c2b6fd6e2089362bb1d471740bfd4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://melodylavernebettencourt.com/media/file/xugiz.pdf In PDF document text
    • https://adurucui.com/ckfinder/files/lojemepavawod.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/sejigeribesar.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/sukiridiwapurup.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/zuvofivadezonoxowixeb.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/62350827486.pdfIn PDF document text
    • http://kidzcastleschool.com/singhania/downloads/file/fegezonewafokerevutafu.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/69807105071.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/rapupudifesivaxupodow.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/81595885166.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/11807936076.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/18879638964.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/94242021434.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/53294182441.pdfIn PDF document text
    • https://deepex.hu/hirek/files/5870632023.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/vikatuzekeweke.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/jekulabapoxegadoluzoza.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16156970da2306---ritogewoxusometawewesipen.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/gugoge.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/21797045067.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5189e4de9---sujaxa.pdfIn PDF document text
    • http://www.moyekolodin.com/files/49668432714.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/sijodezi.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20211001_15D810C25B4FD065.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/tivukasuvuv.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/38044797135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=netstat+command+to+check+established+connectionsPDF 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_off0000b62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB62E 10744 bytes
SHA-256: 7a93b95f334d86e9191087c8cc2af8dae2093bbfa2129bbc3a0044e7263ac77e
font_01_sfnt_off0000cea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA6 16648 bytes
SHA-256: c1c714802bd43726a616e7893a781b20eba543a62f6e076395a6b83fafa8dffa
font_02_sfnt_off0000f9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1