Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffeef810df99fda7…

MALICIOUS

PDF

69.8 KB Created: 2021-09-12 14:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6e79241a794b418a44fb8915f04a349c SHA-1: 120b54e8dbb620d0adf66a7a00aaef45c8de4ae8 SHA-256: ffeef810df99fda76783376abffe9eec7b96af016149ee9f04dd66c950e640b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of linking to many distinct hosts, suggesting an attempt to distribute malicious content or conduct phishing. Although no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/3720659187.pdf In PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613864e934d92---vejazagegivet.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/nifurinesojokikizuxofigil.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/138309161.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/mividajutejudatitodit.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/berazumovogufub.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/fafetasogimok.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/texetajepamofasiboxivu.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66823078165.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/51712379424.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/48413931277.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/k7nh2q2222rt115uofmpj3lqd6/37840596719.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/gifojifepejuxirusotiworiv.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/50878895363.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/memewuramisimukabedukuwaz.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/lofusol.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/91716106104.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/padagataliwed.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/sijugenut.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/69766530641.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109051944418071.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/kunax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=i+music+apk+downloadPDF 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_off0000b018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82A 16548 bytes
SHA-256: 7b66d10950c4f6f6c3035922d0dbfd2223b7c17b8c35cc43bc9e46a38bd20193
font_02_sfnt_off0000f1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F8 10576 bytes
SHA-256: 836e47eb2279c66163249946f3b21b16fcb9c819b7acfdad3b583dc4b72c60af