Malicious PDF — malware analysis report

Static analysis result for SHA-256 046dd8de3abddcbd…

MALICIOUS

PDF

73.9 KB Created: 2021-09-26 20:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3baae39748ec3cff52ae186accf84009 SHA-1: 92f25779cf1e89ef15cba664960767f04a580d92 SHA-256: 046dd8de3abddcbd4e450ee18a2f4d4a905668a39c9b5f3ae29d6ca83292b11c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document contains numerous links to disposable hosting, likely to obscure the true malicious destination. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://dichvumayphoto.vn/webroot/img/files/66965580503.pdf In PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/29641393626.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/36941990873.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64075137977.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/rigeke.pdfIn PDF document text
    • http://360global.ca/userfiles/file/zafugofabikadununevog.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134bcf6b2b6d---venesoropavoxasedomi.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210914084503.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210904040939.pdfIn PDF document text
    • http://origo.ws/userfiles/file/44204847563.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/pegubi.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/25461946551.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/52287590369.pdfIn PDF document text
    • http://stl-hk.net/userfiles/41273096118.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/niditopevenovi.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/97828440453.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/5b0a1f4dbd562f719038cefde5052707/9589055665.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/laxefuvi.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/buvezusulixikowowapupi.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/vixirasogelokulogidozub.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/25474927618.pdfIn PDF document text
    • http://perfect-aerosol.eu/userfiles/file/74637840385.pdfIn PDF document text
    • http://selidbe-beograd.info/files/monuwivirul.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/51785709337.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/58219594675.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=love+keyboard+app+downloadPDF 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_off0000b903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB903 18944 bytes
SHA-256: 8fbd8d0e1cc6acc5578fb9f8de22c4b5f0111cb3abee9aed31f8b7b67bb1a19e
font_01_sfnt_off0000ea32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10249 10484 bytes
SHA-256: 866af36d935dcf07149bb301b45a64b69aa6267090ebdf0d4069ab7e80c86b73