Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf585d670e8bc3c3…

MALICIOUS

PDF

74.3 KB Created: 2021-09-17 04:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 476004259945deaccdb836379a7299e0 SHA-1: 7dd2d0f26f1cfc556b10815a9c370ff0fc60df7c SHA-256: bf585d670e8bc3c3d3501140ca0cfde68b8a034eb16551a99d7cdfcb41d58448
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing infrastructure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating the PDF is designed to host many links on disposable domains. While no scripts were explicitly extracted, the nature of the PDF and the embedded URLs strongly suggest it's used for phishing or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://chcial.ru/uplcv?utm_term=sleep+cycle+premium+crack PDF link annotation
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/84448164497.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/36545130114.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/21040533627.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210916034824.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/kifimadiniwamenepizal.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/pisit.pdfIn PDF document text
    • http://csp.hu/editor_up/balomulamijopov.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/95420430016.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/92959829831.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/24b77e6b4b56d143c776812f200140fd/9054973740.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/rinetiwarubogovoririxir.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/pemataro.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/femomuzin.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/nebudokig.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/96221603367.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/90762446950.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/tevojavu.pdfIn PDF document text
    • http://preiss.at/upload_files/files/2775776050.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/fetulaxaxuluros.pdfIn PDF document text
    • https://patc.fr/imagesfile/guxabizalutakobewe.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/gapoxuxe.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/34639957701.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_off0000bee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE9 17524 bytes
SHA-256: c090c23ec671740e9cd6254245989786321f2603791a78dc76dde625c2cb2966
font_01_sfnt_off0000ec93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AA 10428 bytes
SHA-256: 1505403b2948178aaa607d42660b8e0e2ca4a5ad724fe32ba445d0070a99745f

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