Malicious PDF — malware analysis report

Static analysis result for SHA-256 16adbe0eead417be…

MALICIOUS

PDF

82.9 KB Created: 2021-09-18 07:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b66412644dca91bd38bda6b85997dccf SHA-1: 342be1ccfa91171caeabc02e724e518be7fa47c3 SHA-256: 16adbe0eead417be4f80b65fcbe0862a7ff561a743cc31dc8404482f690dde0a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, identified as a link farm on disposable hosting, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=streaming+film+the+kissing+booth+2 PDF link annotation
    • http://mylodge-naoshima.com/images/blog/file/vixujokusagiwaz.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/jufuxabududimoxi.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/32047756429.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/fopexategaju.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/25250706210.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/tetedefezojuroziregul.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc29626baf---sezigegonarug.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/dilopatalakapafujipe.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/dadadetesaridege.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/25228351289.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/32116186568.pdfIn PDF document text
    • https://clinicscrm.com/img/files/60549941954.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614446ef4607d---82906008068.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/zuduluj.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/76871514573.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/dilulasisomememu.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/59843388065.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/27324152729.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/nefifamagipabe.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/lubupisoke.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/wunigim.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/xaredivukit.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/17150366990.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/wasenamojusigonigimimab.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/79398051808.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_off0000d98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98F 11088 bytes
SHA-256: b9e2679a4300521c18075085f75931df95bc6a8e3658b04cd85323cc0ce4cf12
font_01_sfnt_off0000f33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33C 19432 bytes
SHA-256: 986dd9e975b198b157b610fa28c0a4bb4baaf4f7256601ee4fd08b7ed26c2d74
font_02_sfnt_off00012627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12627 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1