Malicious PDF — malware analysis report

Static analysis result for SHA-256 833d1193ca40bf96…

MALICIOUS

PDF

85.2 KB Created: 2021-10-11 05:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c4e6d1315d973a2969341eba41a85f1f SHA-1: c02632847148a9d61df69f611c5a6ff82f3a10ba SHA-256: 833d1193ca40bf96e692613a6114ff9974f036c89f6c290b14e47c693efb327b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of a visual download button and numerous embedded links to external PDF files suggests a phishing or scam campaign designed to trick users into downloading further malicious content. The document body is heavily obfuscated and unreadable, providing no direct textual clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://faradtvandor.hu/picture/userfiles/file/rujogesizajuzafiv.pdf In PDF document text
    • http://ipceurope.be/assets/file/2743818130.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/95624423715.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615eb8972e590---94138894091.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/dokuroxikuviwelosuke.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20211003_BB297EA0220C16BD.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/dukijokepetofoferuv.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/19907453837.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/vudanovu.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/tirogegaxefexiritibumi.pdfIn PDF document text
    • http://yipdeals.com/app/webroot/upload/files/41458756289.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/26697543889.pdfIn PDF document text
    • http://membranekeyboard.de/_data/file/mojozipukelazupudab.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/vuxafotowosogaxovin.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/demefiwivanese.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/xupazesid.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/pipewad.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/puwosebo.pdfIn PDF document text
    • http://yieldpharm.com/upload/files/mulufinorotikeb.pdfIn PDF document text
    • https://merlak.ru/userfiles/file/baxafilos.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/64917310342.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/70302168154.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/doposotabenepujubero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=agneepath+2012+full+movie+download+720p+blurayPDF 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_off0000e5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B3 11608 bytes
SHA-256: f98d0b79bd371a38acd2c18344ae703ca5f0f304755de7e41f403f1beaafea7a
font_01_sfnt_off000100de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F0 17944 bytes
SHA-256: 77fa718898437d3fbb8c44348bcd56548a1bb0e59af1a9aa03a2885ed036a5c4