Malicious PDF — malware analysis report

Static analysis result for SHA-256 23484737bfeb31a4…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 07:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c48d28970a0d9dc17d243865981ac68c SHA-1: 8056c4908e3d5e46ef3a3611a08965099568f1a3 SHA-256: 23484737bfeb31a48f6abaed7e9ecaf03d1e93df145b59335ac513fd0a443a4f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to potentially malicious domains, and is flagged as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://sheenabusesandcoaches.com/userfiles/file/13156559943.pdf In PDF document text
    • https://aprilboya.com/userfiles/file/47697890051.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/rovaperinodagadi.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/sumuguwurabodumej.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f03a3817e3---49878998975.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/55787263809.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/sujebosuragiz.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/4558982641.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/91716323401.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/tifolitipe.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/84132628706.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/besipa.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/23592492958.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/48574872337.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/4511060785.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f63d9762e2---tetisadobaxaxubagowage.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/32718269697.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/zipebalen.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/nikolonomibenazi.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/rixobipavobuwetozax.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/69466006987.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/pepegip.pdfIn PDF document text
    • http://videlec.be/ressource/file/suguvovurizolidafox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=nds+roms+free+downloadPDF 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_off0000dc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48C 18372 bytes
SHA-256: 64b3193203f6b61506b0b9e84f4e354fa47cd8de8ab3e80f1683283f7ed7b5f3
font_02_sfnt_off00012475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12475 10388 bytes
SHA-256: b76a5cc90d1ff886800951efb73a8d71cdb22ee03f37ff9224cf9661be31fd4c