Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb6b6e12a7671907…

MALICIOUS

PDF

86.2 KB Created: 2021-09-21 01:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 201f670dbb0712ac179a8bb235a86e53 SHA-1: a35e62dae80cd26598784ac124dd9f2541b42bbf SHA-256: eb6b6e12a7671907768355737f005b93fe3e1613af2eb0c2f729f8d76c309c00
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to PDFs hosted on disposable domains, indicating a link farm designed to redirect users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://panda-es.tokyo/yamituki-n/uploads/files/dilezu.pdf In PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090403193669.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613f92fe4ecb5---tusujoxid.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/vurewanedutisegu.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/nuniradirarezitaxowaxex.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/milapirufipudi.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109201628038714.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/vefubupubagulakatofikota.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/73397315932.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/dogobimurumikomubis.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/66664226307.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/83704853711.pdfIn PDF document text
    • https://full-flavors.com/img/Data/file/redesu.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/55391796739.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/lulajebinem.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/21686893845.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/96746409212.pdfIn PDF document text
    • http://popeyebio.com/upload/files/wetawuje.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/natoremasasirerubepege.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/pumovifadekebojixo.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/882983771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=garmin+sign+inPDF 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_off0000ee68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE68 18064 bytes
SHA-256: 322c74aea7e67d9bc0b9168d434f2c91dee9f95a750c6c37f498cdaa1ed3fb61
font_01_sfnt_off00011d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13522 10096 bytes
SHA-256: c37bf99384ecbb6517eb47adb48453666e755bf424af502a2b9b0c98ac2aac45

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