Malicious PDF — malware analysis report

Static analysis result for SHA-256 564459d7fb3b7b9d…

MALICIOUS

PDF

86.5 KB Created: 2021-09-14 11:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9e23bd8ac0f22edfbacd5198b0460520 SHA-1: 27520be39e9d4daf3a5a5d4574fabb72acc5fa5a SHA-256: 564459d7fb3b7b9d2f88f1139765eb290af45ef0955117440c1f362d71bdc22b
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, with heuristics indicating it functions as a link farm on disposable hosting. The primary attack pattern involves directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nbcmedia.vn/ckfinder/userfiles/files/27609701415.pdf In PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/tumifuloroxadijepogasa.pdfIn PDF document text
    • https://priscar.com/documents/files/28001526443.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5cfdb5c5a---77627915614.pdfIn PDF document text
    • http://contelex.it/userfiles/files/1601452217.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/23736720036.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/jolelajulu.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/dilokeveberibipuw.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/73997531894.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/46372108192.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210913140645.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/gotab.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/25669164683.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/92176244890.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/vesowukekekivemamotare.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/karadatusa.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/jugikeli.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/bemojexemiki.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/66362191951.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/8232588423.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/99533695518.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/26389011401.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/dipazis.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/29531687247.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/73674357268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=best+database+for+android+appsPDF 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_off0000ef07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF07 10636 bytes
SHA-256: deedcea2155a28a2b7e21deb3e14fdabd98e7b32518a873887743d7aeced2657
font_01_sfnt_off00010752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10752 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F64 17328 bytes
SHA-256: ce2b904553a6c7b7bbf642f9c8fcc55b51204e6c60f5422e03a2f34fb45763dc

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