Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d207b92ad3fcc8f…

MALICIOUS

PDF

74.5 KB Created: 2021-09-18 09:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 07cfa0403bb4abca737fd587ce07faf1 SHA-1: 153562cc30ed3d6cc4c7fcff6b438d6c20222b0b SHA-256: 9d207b92ad3fcc8fac36050d705c85c8d7e2a7b1d47e91b6128031b1c5a32453
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing or link-farming operation, as indicated by the high number of external links, many pointing to disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs imply an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/56128931856.pdf In PDF document text
    • https://aldapa.eus/files/galeria/files/liwetibotide.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/35411548298.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/86535649523.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/69810324105.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/muralejojobodesodi.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/gikajigosekuvamoda.pdfIn PDF document text
    • http://yztools.com/images/upload/File/dulafemikoxotakanirapebon.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/dijuzeziz.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/dbmbb86p4ercjcho73it44adpp/28547003077.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/tezidavozupipuje.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/56080000134.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/79hpk1ls2vme90ubuklojof8o7/28484734600.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/35172245182.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/gedaje.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/pagafuzisazelik.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/lodojatulafadago.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/linurusulabu.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210902023727_298259.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/36247053468.pdfIn PDF document text
    • https://gangnampools.com/contents/files/89183576296.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/32237401362.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/67372433009.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/luzikebisepi.pdfIn PDF document text
    • http://katachizu.com/img/news/files/61227674225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=laiye+je+yaarian+full+movie+123moviesPDF 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_off0000bee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE1 17052 bytes
SHA-256: 9a491cce24df36450f9b3ba9ef2a3b88f36034a74a64512a4437c68297ba8da0
font_01_sfnt_off0000eaeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10302 10988 bytes
SHA-256: 6a8440871d8ea33dc8a4f0ac6f9cd94d7bbbb066f2e12a44b147f6fe51f90044