Malicious PDF — malware analysis report

Static analysis result for SHA-256 32e97bee3c15b47d…

MALICIOUS

PDF

87.3 KB Created: 2021-09-09 23:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4cc15f921ea83c751f5e82140ea6f87c SHA-1: 2043020222b77d4427999bece66af4f3338f0731 SHA-256: 32e97bee3c15b47d10a7c978b724f242220554ef3a9688898e9967f5813ee164
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a common pattern of using embedded links to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ornito-silesia.eu/userfiles/file/45365858638.pdf In PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/movigotulipotizafero.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/28200884762.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/63214178742.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/gobumisi.pdfIn PDF document text
    • https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/71322362373.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/82295214910.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090222063273499.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/42090870383.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/lumivigexetile.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/wabagijoxakafot.pdfIn PDF document text
    • http://rubensova16.cz/files/file/patofekuwakijixezabiju.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/55479790681.pdfIn PDF document text
    • http://idcla.net/upload/files/92334231500.pdfIn PDF document text
    • http://lovesenergy.com/file/ripobovawefe.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/61041587296.pdfIn PDF document text
    • http://abpaluso.com/upload/file/42194705503.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/dedexuxe.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135492e48274---86972205149.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/datugepiwak.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/jabuxubukazob.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/80986668220.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/gukusewozel.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/bilowosewisugebesivup.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613614d4217c1---koxakonumowuvakaxabili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=hack+football+master+2PDF 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_off0000e942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE942 10644 bytes
SHA-256: 197d421a48c5682f41811af3725b428271d937cab321c1eb800f991cd7afc9ba
font_01_sfnt_off000101c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C8 20308 bytes
SHA-256: d1cf7abea6e0bcf482489a2f29ccb56dccc6d6219c636c058c861a1b8025416a
font_02_sfnt_off00013791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13791 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1