Malicious PDF — malware analysis report

Static analysis result for SHA-256 d14888c646175bd8…

MALICIOUS

PDF

77.2 KB Created: 2021-09-10 14:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f20c1082433522a3c075fba1f7ca7f64 SHA-1: f1ec9227802e36611b977b76d4f1e3d9069deecf SHA-256: d14888c646175bd800a2ce0ca7b75762757c5c3768ab184cdd6bacc65d9617ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ClamAV as Pdf.Phishing.Trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of external links and the overall detection pattern strongly suggest malicious intent, likely involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=android+system+utilities PDF link annotation
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/46579626989.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/46235303498.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/dixotidowoxebox.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612faadde1937---fuladorige.pdfIn PDF document text
    • http://opsir.eu/files/file/48692019902.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/5240947656130f92a30c6c.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/95558962046.pdfIn PDF document text
    • http://zae.me/datafiles/file/suvuvoxefemevozanigofar.pdfIn PDF document text
    • http://inistor.com/ufiles/files/77137632623.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/57242334580.pdfIn PDF document text
    • https://laser123.com/geektic/files/fizex.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090416442322.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/76233222061.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/gotajerazipukusul.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/zinisujisurupilenoma.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a27fe9aff2---gowewofuxaxokemi.pdfIn PDF document text
    • https://actor-conseil.com/files/file/zutawodubot.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/44977998694.pdfIn PDF document text
    • https://phuquiland.com/upload/files/23932370810.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/gejotuni.pdfIn PDF document text
    • http://kasargod.net/uploads/file/tazewabiro.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210909115844787040h3yzt.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/dexefilupafovejapijidetel.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/93617648149.pdfIn PDF document text
    • 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_off0000cb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE350 17124 bytes
SHA-256: 32abf055c82c61bde47cd4df411c8617aea591afd11514ef58b85f057e3613f4
font_02_sfnt_off00010fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC8 10440 bytes
SHA-256: 4d79305d89a05550c55de2c34f80afd47b766840ec00db700b83d78c1e23fbaa

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