Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aed5a571fde3d85…

MALICIOUS

PDF

71.8 KB Created: 2021-09-20 14:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 29d74490c14a1aef827141547af13f30 SHA-1: 41268b261947f5d610ebf557b7060b2f8b1f6e23 SHA-256: 5aed5a571fde3d8570392a1dfa84ceaa76a149ad08acf53a84cd8b71b57979bc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to disposable domains, suggesting a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and a link farm heuristic points towards an attempt to redirect the user to a malicious site, potentially for credential harvesting or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://yomadesign.com/userfiles/Proj_Name/files/xewewobokiwipofiled.pdf In PDF document text
    • http://ceramkgres.ru/userfiles/file/podixobexarawaf.pdfIn PDF document text
    • http://domario.ru/userfiles/file/88326531543.pdfIn PDF document text
    • http://3m18.com/images/editor/files/89587366558.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/batisemogujinatuje.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/nikefedijejuloke.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/89437467722.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/pujepolimifimaxatasubuxu.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/nufilarut.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/54411481767.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/88806723759.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ca3d62108---60511582458.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/16332189006.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/dajabukalotur.pdfIn PDF document text
    • http://grimastone.ru/files/85059872143.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/bewuka.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/38047770239.pdfIn PDF document text
    • http://tlznailspa.com/media/files/vuwolinexu.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/futunosusekugesofadub.pdfIn PDF document text
    • http://origo.ws/userfiles/file/59389004070.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/56755910595.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/tagabijogasagivorujug.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/20274628465.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/69905252836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=dream+league+2019+apk+obb+highly+compressedPDF 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_off0000b2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F1 11668 bytes
SHA-256: aeced0ab9f4f2241fd7d8250611836d963df9306f6af3fa4617a552f668c481d
font_01_sfnt_off0000ce62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE62 16356 bytes
SHA-256: 6136a1481e01780ccd7809d445411e3c512d8907fc91dae9c1744f3cbd17f7a2
font_02_sfnt_off0000f800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF800 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1