Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c286ebed8653a3…

MALICIOUS

PDF

82.7 KB Created: 2021-09-24 03:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 970fce547edf0078c80e243376133082 SHA-1: 77e2da1968d85b51d83f6b77fe42446fb9a1529a SHA-256: c9c286ebed8653a30da0017d705d2835d269e5a614d677d049c88ed1f6f2eca4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to other PDF files hosted on various domains. This pattern is commonly used to obscure the ultimate destination and distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://chromowane.com/userfiles/file/wajeb.pdf In PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/12230502338.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/9459833892.pdfIn PDF document text
    • http://khocabien.com/uploads/files/57556741818.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614547935daad---28204304152.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/51173078676.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/49552621614.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/parumogini.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/gelaluxidugumem.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16131c2fb2af9e---tiwurefuzobibomo.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/96994409457.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/16511372186.pdfIn PDF document text
    • http://stringladies.cz/userfiles/22914178935.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/32128731620.pdfIn PDF document text
    • https://nghiepvu.udicmanpower.vn/uploads/news_file/zuwagojop.pdfIn PDF document text
    • https://mahae.hu/files/files/kadusi.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/wiguz.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/povudovenizifugabidefe.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/15514329210.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/pemuposidaxanibojosegixo.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/daruwarub.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/tupetudopekaseba.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/sitetogovonitoxu.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/30706150418.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=download+supersu+zip+file+for+androidPDF 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_off0000de43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE43 10640 bytes
SHA-256: b87861bf24aba9050d3850a6effe350cb99cb5b1596aac323deb2c28846ea782
font_01_sfnt_off0000f6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C7 17988 bytes
SHA-256: b13941754faaaffc055bd0f71f08256c2c81bb8d74b06b8d3c80fa9195b12bce
font_02_sfnt_off00012521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12521 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1