Malicious PDF — malware analysis report

Static analysis result for SHA-256 72bbc56490ca52c2…

MALICIOUS

PDF

91.2 KB Created: 2021-11-07 14:02:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 52fe62493a70b12bbb7f381fcae83028 SHA-1: 1ce4b968701cccfd7b4550211dbabfa85b11ef32 SHA-256: 72bbc56490ca52c2904d328843b0d634a42fcc2aa426b3f6dbfeaa3880e4be50
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://clubselectionvoyages.com/images/file/susokilagukavojinuxo.pdf In PDF document text
    • https://pchome.uzai.ca/upload/files/jifusowi.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/38095125284.pdfIn PDF document text
    • http://villkasz.hu/editor_up/mivivigeladifinoforemi.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/pabugafusit.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/24505417811.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/nabesufatutuluniv.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/28212859368.pdfIn PDF document text
    • http://kodemari.info/data/files/vanotesurijutekadixixaw.pdfIn PDF document text
    • https://primer-spb.ru/files/files/mufemevigobiwaf.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/87881291865.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/8909368291.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/pawekafid.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9249de119---58341058885.pdfIn PDF document text
    • http://splogservice.ru/content/files/zigimuzevur.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/najijuzumapizanubitiji.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/dofozigob.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161867bec2e661---93859985572.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/kijazufamenunoz.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/43987111562.pdfIn PDF document text
    • http://webursitet.org/Files/file/22014371767.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/furunepon.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/gidizude.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/tovirafokabanefamivipeg.pdfIn PDF document text
    • https://ismart99.net/upload/files/82161749474.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/22027125855.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/6Zflnl449io/uplcv?utm_term=best+300+blackout+subsonic+loadPDF 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_off0000f96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96C 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_01_sfnt_off0001108d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108D 19976 bytes
SHA-256: fdcde49a7f1c44e5d1e4fd4e55e6cefc7f0e16ff78c5203f166ea7a16acbda93
font_02_sfnt_off00014529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14529 10944 bytes
SHA-256: de84253dfbf15f44af9267879032a3a2f094af5a7816fc8b98f90b08a42284fd