Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf3499504b5d970…

MALICIOUS

PDF

69.5 KB Created: 2021-09-29 13:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5fe0b1c85fc57b7258525bdfe0dc4cd8 SHA-1: 7e38ae7334c012717bca1e126a02ef22a1ec4f8b SHA-256: 8cf3499504b5d9701053b9f16d6b0a5e52eabef43a63d971fbf2f39038787e2c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers, indicating malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or distributing further malware. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags the PDF as a link farm on disposable hosting, reinforcing its role in malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://laborke.ru/uplcv?utm_term=my+brilliant+friend+season+3+watch+online PDF link annotation
    • https://globalathena.com/ckfinder/userfiles/files/6980209586.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/32776378448.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/55600476181.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/lirokevi.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/nozazipaxiwekav.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/bunin.pdfIn PDF document text
    • http://chikatere.com/Upload/files/74095333684.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/14330004395.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/wedijarenukiluvaxav.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/mudigerijak.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/80981437345.pdfIn PDF document text
    • https://windscrm.net/files/file/povomukowipowufojusavusit.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/ponegedegebamafiza.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210925182537.pdfIn PDF document text
    • http://sungder.com/upload/wekimemasetemepejeduj.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/totetuzilipubifuwav.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/63593498844.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/44694763686.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/24706416930.pdfIn PDF document text
    • http://sdes.in/uploads/65186647374.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/wifuba.pdfIn PDF document text
    • https://e-room.co/userfiles/file/kudog.pdfIn PDF document text
    • http://mawarids.org/mpfiles/file/sarit.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_off0000ae00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC617 11080 bytes
SHA-256: dc9287399d905e235230a1c878d4d282d3017b862c7289b94e15f3e2dc629b62
font_02_sfnt_off0000dff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF5 15856 bytes
SHA-256: 2bf01817a7d1f010d94cb77f9b05161e4d10e2cf6efdd0da423ae9141c2819ea

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