Malicious PDF — malware analysis report

Static analysis result for SHA-256 948853286e8883e4…

MALICIOUS

PDF

76.2 KB Created: 2021-09-20 07:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8d93a12a38ba2b35c975df0eeaa93a59 SHA-1: 2a9d6dbecced917aea9c92a33ddc6feced3c0655 SHA-256: 948853286e8883e423d4ece969ddb1be28ec2e5c2def7817953f86328b671b20
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. It contains numerous embedded URLs that point to disposable hosting and act as a link farm, with one URL specifically mentioning 'genshin free gems' as a lure. The presence of these links suggests the document is designed to redirect users to potentially malicious sites for phishing or malware delivery.

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://oniceh.ru/uplcv?utm_term=genshin+free+gems PDF link annotation
    • http://espwireless.net/uploads/file/zuxupabatosijodibutekug.pdfIn PDF document text
    • http://tercovci.cz/files/file/65894716503.pdfIn PDF document text
    • http://dolonchem.com/upload/files/woginokivuludolojopufotib.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/43760057036.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/wijedefefebefod.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/tililikitipojavo.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/xeludasegofedixidojat.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d8d9caccf---dibufeganebate.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/nenida.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/bamivemujaze.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/vurapugepugozelew.pdfIn PDF document text
    • https://umutfm.com/resimler/files/29058167838.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/zopuzurisefagosuzusa.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/99855565796.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/jumalirebapemulakuj.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/42742447430.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/wafuresukuziwerole.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/nuzovudivovubi.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/87585414395.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/49637701963.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/wexubevirifezubax.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/lowikufikukegu.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16138814ee2ad1---tezajowasojajamuwaki.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/kowexedenusonevizixixer.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_off0000c739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC739 17568 bytes
SHA-256: d593e02a88455b6e8ca2fa152b2b3182037ab34afc1517cf04b1d67b95661cb3
font_01_sfnt_off0000f4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B4 10276 bytes
SHA-256: 471e4bc14f75a87746ccf8a91bbf6e48a9a818dab9fa68ef7147b6de866e94b2
font_02_sfnt_off00010b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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