Malicious PDF — malware analysis report

Static analysis result for SHA-256 f417be3a0b481c73…

MALICIOUS

PDF

95.8 KB Created: 2021-10-08 09:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 472ad5876e7e1600e6e4e4dc080d86b7 SHA-1: d36376c96a93580d2310f0379755b7519c3bb114 SHA-256: f417be3a0b481c73807739a32460eadb9d3956a8aad5c194d0e9b1147bbc01cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to other PDF files, suggesting a link farm or content distribution network. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent related to SEO manipulation or hosting further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://atlastoursntravels.com/userfiles/file/lijunikopofutagafamukudi.pdf In PDF document text
    • http://www.sandipmallick.com/fckimages/file/9635238841.pdfIn PDF document text
    • http://idcla.net/upload/files/82525042139.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/13881042144.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/72080812747.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///jexefubegutolimutagireb.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/57353437831.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/sixuwirexewuwopopilo.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/66929729652.pdfIn PDF document text
    • https://arerp.kr/data/file///dawogiwoxotiz.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/duvugagazamobejobolebus.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/xufuw.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1615cfa57cb92f---xumadebeteket.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/jutuf.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/28208159724.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/wozisijigez.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/49384195324.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/98946947084.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/gepodogezagenoz.pdfIn PDF document text
    • https://renetravel.ro/images/files/wexesisasevoziwaj.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/fopaw.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/84676808665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=dave+gorman+terms+and+conditions+applyPDF 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_off00010dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD8 19512 bytes
SHA-256: 7d7980cb6ed65a5754b8edb4fb7a9b6b7689eff63d258cb647a600bff0452254
font_01_sfnt_off0001400f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1400F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15826 11036 bytes
SHA-256: fdf3105b990d5f687582e1bace909676899f36f2e9c46fead10143da542cb23f

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