Malicious PDF — malware analysis report

Static analysis result for SHA-256 eebcfec454c17016…

MALICIOUS

PDF

82.3 KB Created: 2021-09-24 00:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: f697fe48cf5060d819c58e60b17c52b3 SHA-1: 5e61cfd01686131d1e025cff206a02b8baf784af SHA-256: eebcfec454c170163adec25553f547c55a2ba19fe2726d7b0a9dbcbdec690215
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, and one heuristic specifically flagged it as a link farm on disposable hosting. Although no executable scripts were found, the structure and URL distribution suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://boxerdapolenta.com/cmsimple/images/file/kares.pdf In PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/bokepasufewodalupobo.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/wuduf.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/nulamazizulojerurefo.pdfIn PDF document text
    • https://grandegroup.net/files/sewedu.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/84456403965.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/nejilulomejoki.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/65329206663.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/tutedawedujo.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/vivufokewupulolamugat.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/pejuxama.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210911_8199E981CF66B671.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/dulomasovererobike.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131315dbd852---xejudabigubepudu.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/xonin.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/xuniratusobimugofugevum.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/melupuzuxu.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/91636514484.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/50274940678.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/bilifetagizotugibopopin.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/mulabiv.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/62889926188.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/37019852834.pdfIn PDF document text
    • https://synersys.fr/contenu/file/93294876719.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149fa2c5d60c---rebenijosumikilefowaxemug.pdfIn PDF document text
    • http://polipack.ru/content/file/giguwixukas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=kubernetes+up+and+running+dive+into+the+future+of+infrastructure+pdfPDF 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_off0000d943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD943 18460 bytes
SHA-256: 49264060e8e81553291d9b1b1f5f8b5cdeaf4a07e47ed680212d31bd458a04a5
font_01_sfnt_off00010967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10967 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001217e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217E 11152 bytes
SHA-256: b868ac412c4fa7909a161ae2c12c71b189696df1a1017eec42c2b24dae053d9f