Malicious PDF — malware analysis report

Static analysis result for SHA-256 840597d6195a5863…

MALICIOUS

PDF

82.7 KB Created: 2021-10-05 18:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6c9ae92215c3fd88cf3d127424f75934 SHA-1: 5d8bbe33d58f3db34cdb2fcb816e4d815cd1aedb SHA-256: 840597d6195a5863fd9e8b909d583ac8cd3775e5d10c03ce33ed9fcc380e021f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) suggests an attempt to exploit PDF vulnerabilities or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://5974293.pasarantogel.com/contents/files/78722122131.pdf In PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/xivut.pdfIn PDF document text
    • https://arerp.kr/data/file///87104160255.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/pirubejanusuzoxepovuvod.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/bugavum.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/40184339667.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/kujiwizib.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/fosurolo.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/64168377335.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/dumoradojifavelasu.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/57069008875.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/bemizafasiwezogulekukudor.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/46584805141.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/kujuvapuman.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3e22d9971---54980005817.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/vanokudomuduniwoluzaxot.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/tikoxamobulabogafak.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/48008546576.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/labozuraje.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/n34r5m2n6scbmr7gj8oevkb5lq/90905142030.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/97409282751.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/82952660970.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/24169349142.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/38928255039.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/96794951214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=relationship+between+management+and+leadership+pdfPDF 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_off0000df4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75D 17012 bytes
SHA-256: 6bc71fb35d64be678cd2c9df7735cc351bffd2c36d3da1d4b3056f70d2bb634b
font_02_sfnt_off000122c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C0 11216 bytes
SHA-256: ddb51309a2b8ba40b179c851494e49ebb39dc1813d9947907a09d27e9a64592c