Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4786f01d8129ee5…

MALICIOUS

PDF

69.7 KB Created: 2021-09-28 21:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d461b601ea2dd1c432f213f39a91efdf SHA-1: b696bced09b01d3a62adb656ae899bf7d63c3915 SHA-256: c4786f01d8129ee5e81113a22f59bdb83354703bad9c2dca45707bb0fe3e780d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for distributing malicious content or phishing.

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 http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16142615b8c89f---papanezonujerojutaxov.pdf In PDF document text
    • https://philly.drinkpoint.com/uploads/files/jijonovukazapinugibup.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/pudusidagetotegupokazuli.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/20361829461.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/51681350219.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/23021162601.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/35518232155.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/livinebotefako.pdfIn PDF document text
    • http://generoussecurity.com/uploads/sevebipupiwa.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/bikogijosoz.pdfIn PDF document text
    • http://health-bridge.in/upload/file/dinujagexadedav.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/vibarogul.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/masepexizunodupupis.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/10338951579.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/lusirugaxuzexinejudi.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/gixofofomux.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/38288135520.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/64111296425.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/jesepuvegenut.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1614256871863e---pozijipuvab.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/78705063967.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/femobozowefewe.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/19794827114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=outlook+calendar+not+showing+up+on+iphonePDF 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_off0000af7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC795 11096 bytes
SHA-256: 907d61d46755bef1b87bb5da07c98b9d667e0854e031b1451d07db430dc05960
font_02_sfnt_off0000e147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE147 15844 bytes
SHA-256: cc0896a03c52af50184c25d76656f74ecc434b4b34c27ff4e2140bf68d61bb69

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