Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef25b26968fcd41f…

MALICIOUS

PDF

74.7 KB Created: 2021-09-25 03:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5cfb7b2b1f0ed7f1c0c3377c35e1c958 SHA-1: d409a73ce134f7977a071189d35565672cc989ec SHA-256: ef25b26968fcd41f4f1ac763e5d57bd9e6fac8d283b012608394aebacbacadc9
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, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://studiosaletta.it/userfiles/files/74155785368.pdf In PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/nenabigu.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/jizowiguxome.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/18356018952.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/27599051428.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/desiwazebejopuferu.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/39088194201.pdfIn PDF document text
    • http://buddhavihara.net/userfiles/file/82372145062.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/mipajimowopurovodesawe.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161478b436360c---fakuxofivatud.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/femakakaf.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/70412766019.pdfIn PDF document text
    • http://getem.pl/files/file/63808733508.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/87409812459.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2d4b53db6918f588667faab2f698339b/wopofakebi.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210919_C34F2D7B05AF9CE6.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/butiwenelirelijolefudex.pdfIn PDF document text
    • http://olympusflights.com/files/files/84067312901.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/zawejikusebezena.pdfIn PDF document text
    • http://aquatherm-graz.at/files/59235539065.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/zixaluwegisapumokixizuwas.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/13327006429.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=frankenstein+essay+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_off0000bc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD492 19032 bytes
SHA-256: 75a094d5a06140c17e901b38e91be791d79ed743e350a8cbfb09fcfbfe572831
font_02_sfnt_off000105b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B1 10508 bytes
SHA-256: a3ace0c89d33978175ba04c3c307bc8a500e070700e495178ea093f81987e30e

Open this report in the interactive analyzer, or submit your own file for analysis.