Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83bd91516117095…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 04:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a19067894de8f093f1792dca9779631e SHA-1: cb26a2b5a312c98cdd7391ed11bccf2131cde51f SHA-256: c83bd91516117095d7a9e855cdc22bdf6d49d75d0eb8b4697764a5cba5d646b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on disposable domains and utilize UTM parameters, suggesting a phishing or scam campaign. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://oniceh.ru/uplcv?utm_term=pdf+book+rich+dad+poor+dad PDF link annotation
    • https://universal4shipping.net/userfiles/file/vemakurabovoja.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/gibarexokorigaliru.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/xerodupobebusekibolipitu.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/37546315173.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613602bad92b2---berarutexaseli.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/xudozovebalixijedina.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/folepaxej.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/95577882557.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/vogoxufufe.pdfIn PDF document text
    • http://kgmda.com/upload/files/weruwadigidudowax.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/rerarebemodaviratosiwawa.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/tixepujono.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/solalododewuk.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/31471485295.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/sifurubifebi.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/81502390617.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/49188910708.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210904172303100.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fd50075e6---5075853990.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/fubasozosup.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_off0000de39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE39 10404 bytes
SHA-256: fff75cf34fc04bebf0b0e6c72b338d97eea1af9a280512b049598711a82c4e14
font_01_sfnt_off0000f59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59E 18352 bytes
SHA-256: 08a1772717a9a9df635e9666e813a251f26ec66cb8912bc4c34c33b3659be9b0
font_02_sfnt_off00012531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12531 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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