Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf17859cbe53dd88…

MALICIOUS

PDF

69.2 KB Created: 2021-09-29 11:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 01a122b9c17b3b3fb47d010a21e14375 SHA-1: e802c5792607a33458c454933c38f9ea4bea9672 SHA-256: bf17859cbe53dd88d2eb0cad51c6533bf2be56dde86d2ff349b941a1604da177
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ippinnudon.com/uploads/files/gofifexaxobaporo.pdf In PDF document text
    • http://yishiweb.com/upfiles/files/20210913_023120.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/21810789579.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/vafesajobutugif.pdfIn PDF document text
    • http://short-story.ru/upload/file/xijegitavopikegexapabu.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/66117812801.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/51279546492.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/21439581837.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/3819544875.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/fafeguludiduvupemoxu.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/kurorixelotagoxonimivomu.pdfIn PDF document text
    • http://mauthietkedep.info/upload/files/20432873540.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/zakozifokufiz.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/4478137149.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148e2211d39e---zemizujofukonusijibuli.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/73160082324.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/denofunuzokibanazogaj.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/74936493781.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161418c9643b09---dabofelakagozobukepe.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/41983037334.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210904/file/16307885601641.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/39427278807.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/kufedanikuvarisa.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/xuvafanovogitifuw.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/pupanukip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=pacific+warships+world+of+naval+pvp+warfare+mod+apkPDF 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_off0000b027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB027 14636 bytes
SHA-256: f998c78d721e2e0da956ea34271de712c910e1daf52d9f347b787d4aa9235d25
font_01_sfnt_off0000d510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED27 11032 bytes
SHA-256: 538a02a23c31b976bf2dba1d87126706febe1eb610a73b80bbc1c2522ec4c809