Malicious PDF — malware analysis report

Static analysis result for SHA-256 2558d8dc92deded8…

MALICIOUS

PDF

79.6 KB Created: 2021-09-08 20:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9e1acef3746ced101828a82d7344244b SHA-1: e53d2f8b9947aa7ff9a440fbd69860d25ef2e10d SHA-256: 2558d8dc92deded8003dc262b61ed0688c4f70b76134aea0affedc4437564cef
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 embedded URLs, many of which point to potentially malicious domains, suggesting a link farm or redirection mechanism. The PDF structure and the presence of external URIs indicate it's likely used as a lure to redirect users to malicious sites, possibly for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://agisma.ru/files/pages/files/modobow.pdf In PDF document text
    • http://www.kymkarajok.net/tiedostot/files/junuvifelilezix.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/3179545798.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/netero.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/oj5d8n7gpqjleks6f12a1rq8eq/gepuwuva.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/ketab.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/fifimolesole.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/40300594976.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/86940079660.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/17567405264.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/28570900795.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/sazep.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/fijojow.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/33653166381.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/bigijeniwake.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/82251025006.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c10d05d14---8648702913.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/92792406089.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/51228123468.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/jifasepetukadewireva.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/pabekun.pdfIn PDF document text
    • http://zl369.net/userfiles/file/koxatuvolodonojotarojirob.pdfIn PDF document text
    • http://lecostationery.com/files/file/nazamujupusogokowi.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/54129095877.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/51193204450.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/34931778388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=svt+digestion+5eme+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_off0000d1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A6 10808 bytes
SHA-256: ecc14fbfbcf7c162e6999464df244db880e41be089aea2f453cc3a0d4f92324d
font_01_sfnt_off0000ea62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10274 18080 bytes
SHA-256: 9d89f9521accd93f06bc541aebb64d279d638c3357cbc12731c8afa1ed6c3bcc