Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9e81f3d2755b253…

MALICIOUS

PDF

80.3 KB Created: 2021-09-23 17:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 024bb5d74857165905a04da3fd56220e SHA-1: dfde76394c1f6d1de855450851184156ad8dbe1e SHA-256: d9e81f3d2755b2532d5141a2d19b2bb416ae95fabbcc711471f21854d82ca4bc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. The PDF structure itself does not contain readable content, but the presence of many external links points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crysiq.ru/uplcv?utm_term=ios+simulator+on+android PDF link annotation
    • http://pop-around.com/file_media/file_image/file/rozirikenakesum.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/bimezepizuverudova.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/sajenekebufadimo.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/suketubilanoxigo.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370a2dd255b---3363597819.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/26258775364.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/ronilov.pdfIn PDF document text
    • http://videlec.be/ressource/file/95807359524.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/28438581101.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/gepovimaxifij.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/terosugesazixexinufel.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138b4889a8e9---59721300145.pdfIn PDF document text
    • http://netart.hu/userfiles/file/48829731039.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/pimufesesesikagadim.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/sifegasunusikomapafi.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/95601926699.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/kodofat.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/51937164178.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/pewofavanakebilomeje.pdfIn PDF document text
    • http://eastwoodfamily.net/userimages/sipobek.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/garajawidu.pdfIn PDF document text
    • http://anm-av.de/uploads/files/fafuzoribobow.pdfIn PDF document text
    • 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_off0000d6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F8 10328 bytes
SHA-256: 4e457b5def8fb4f0e17bb413c0bcaf012545ef83a7717b7e8475a9a55902c9c9
font_01_sfnt_off0000ee33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE33 17488 bytes
SHA-256: b5d48dac007fb2042dd7982a5ae755529cc2df9a8e46e2cc4c3d1880532a8576
font_02_sfnt_off00011b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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