Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f1a98c99a286b6…

MALICIOUS

PDF

79.5 KB Created: 2021-09-09 02:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f3cb2351d2ca9f36630163c58f833e2f SHA-1: b50963b0de66e93046879f713064056a07963d68 SHA-256: e8f1a98c99a286b66a91ba222f2e6f78886f3ccf267f8d29dbcdbe67f6d4b4a5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it is part of a link farm designed to obscure malicious destinations. While no scripts were explicitly extracted, the presence of embedded URLs and the overall detection profile strongly indicate a phishing or redirection attack, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/5d863c5c68d550c6f34ad1887d59fe3c/towovub.pdf In PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/95398013593.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/fenoxe.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/33224739479.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/18344253362.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/59247729733.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/dusisibivezedelu.pdfIn PDF document text
    • https://zagi.hr/files/37747971499.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/fewowovelutofilufoxivu.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/56262221438.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130a591ae065---kedumuji.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/zudebikitavozolonukusix.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/87134266988.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/didiguto.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/85001981864.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/4279885696130f91fd3dde.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/43960605777.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/bazukowisorojosobuzarefuv.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/vebuvukegib.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/61527438990.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/sazokomarumadivuw.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/49512491435.pdfIn PDF document text
    • https://vzglavniki.net/data/file/gilolitanasewuro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=kumbalangi+nights+yifyPDF 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_off0000c9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E2 10656 bytes
SHA-256: c33912e28437119389a13376baa5fc4209e8775b568187b1a1c897741c80047c
font_02_sfnt_off0000fa07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA07 20840 bytes
SHA-256: 518a15b2ae05330002528d0c3a1bc3887be51a21abee9beebc9b606e050e6c36

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