Malicious PDF — malware analysis report

Static analysis result for SHA-256 815af931822acab8…

MALICIOUS

PDF

77.8 KB Created: 2021-09-09 18:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aab74c7497034a470dd0d3b15b91f5a4 SHA-1: 348493038510c443f8c306ff82788e571a36781a SHA-256: 815af931822acab80a1bab58e226c54ae1ce2283feb9b3151a69f531fd4f9dfa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest a phishing or scam campaign designed to redirect users to potentially harmful sites. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://olboihorgaszto.hu/editor_up2/rotekaf.pdf In PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/lefetit.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/gimak.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/21390941874.pdfIn PDF document text
    • http://landpas.pl/upload/file/wovaruniwexibapusire.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/86172862624.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/49774450287.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • http://contextuae.com/resimler/files/25050072620.pdfIn PDF document text
    • http://artediapharma.com/upload/files/23517965382.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/a9mm12u955pvis69imu3kjetq1/72667763748.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/77004286772.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/tekekemafapidojomubu.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/lilemuzumesutoxo.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/togavigexutitumijeguxe.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/rasisujijufog.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/6agecput5h5c9v4obtqv0ea28a/27569925394.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/mijilatenepomosiso.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/83746755614.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/folinuvewemisaveledujatad.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/10837225000.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/kokinox.pdfIn PDF document text
    • http://rentaruedas.com/files/others/63526109969.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/52012896356.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/bofemukages.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/mewilewuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ac+market+free+download+iosPDF 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_off0000c241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC241 20808 bytes
SHA-256: ac22e9ec4ba0335b45aeb84357df224e98a4cb8445262279526d679d5a602892
font_01_sfnt_off0000f702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF702 10796 bytes
SHA-256: a6432b001c7dcc740090483f244e6d62469dc5f465926cd93a7c5565024cd041
font_02_sfnt_off00010ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1