Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2f71ef6810f4f01…

MALICIOUS

PDF

89.6 KB Created: 2021-11-03 07:13:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7d8dfd3a6c6664763117c542978f7103 SHA-1: 4c8ca224c12d46c774ef2094b1e6e6df375f38dd SHA-256: d2f71ef6810f4f01d34e2fae66151d9283bbc0fb7377017f170ee31e2f6393ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://blueyee.com/upload/file/050712009593.pdf In PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/jenazemazisiv.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/japakekosox.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/37746824584.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/zopoti.pdfIn PDF document text
    • http://szcftz.com/upload/muzuma.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/5983574490.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/mapanilaxinumadotiv.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/5028905850.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614162a8bc383---vumuwijajotiluwabujigijuw.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/85648496458.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/rorisopopogafekajebajax.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/fubetes.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/61292362597.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/nuseboma.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/naxuzudafebedoxez.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/sezewazibefoginokeni.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/23509045499.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/kowitekimomedaxegimel.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58861425379.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/48650963234.pdfIn PDF document text
    • http://dmkert.hu/files/file/94331047394.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/64610808116.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/memif.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/TxADE9PCSUw/uplcv?utm_term=treble+clef+notes+solfegePDF 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_off0000f381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF381 19852 bytes
SHA-256: 03cba492e01e5282991b2ec7d9070bbf01f40ceee0ec1b6aa89e620997bd73ad
font_01_sfnt_off000127fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14013 10360 bytes
SHA-256: 4b03febc4ed361a0d75b0c49e856bfbe9b0bdd78ced5f42acd57cc9c6ffc3562

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