Malicious PDF — malware analysis report

Static analysis result for SHA-256 830e6f2dfb0e964c…

MALICIOUS

PDF

81.9 KB Created: 2021-09-12 11:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e858927e22c2f7d5887f5232e2483751 SHA-1: 87c45fad2e821fe37a275320565742c56d3b60a1 SHA-256: 830e6f2dfb0e964c5dc4c97cfa7c9016bb42ef629841c1036d2c801c4f7179d5
126 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to disposable domains, indicating a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://p-jtech.com/userData/board/file/nodoximijove.pdf In PDF document text
    • https://sanmuabancongty.vn/images/content/files/44603984750.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/98672566428.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/48018835888.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090914451947.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/ut3nvurnud6tcaku8lfbunev5m/96739770747.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/mememolami.pdfIn PDF document text
    • https://huanghecables.com/d/files/22098783620.pdfIn PDF document text
    • https://peterdegendt.be/file/wiwul.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132ba85ad3b8---52658502512.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/42625657181.pdfIn PDF document text
    • http://ingore.cn/upload/files/28447508789.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/lifozumategivusexepogagog.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/fowapigagixawesikanod.pdfIn PDF document text
    • http://skupka23.ru/upload/m/91923246899.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/wudexanedepogo.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/retezef.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202195513303821.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/80157350615.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/gesepewim.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/67348463224.pdfIn PDF document text
    • http://jfe.hk/userfiles/89498195973.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/95714288589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=minecraft+witchery+guidePDF 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_off0000dc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8F 10712 bytes
SHA-256: ed80f83696c4e8b0020053aa73bca8c3245eb3eb9b7bc23d02e419c0191e2cd4
font_01_sfnt_off0000f4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F1 17312 bytes
SHA-256: 18240324d820166b2a139e4152dc44ee5e59a6120d03e06581cc961841060772
font_02_sfnt_off000121c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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