Malicious PDF — malware analysis report

Static analysis result for SHA-256 c780674987704bde…

MALICIOUS

PDF

77.9 KB Created: 2021-10-08 23:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: ddc6021b27240a8581061ad9058845f4 SHA-1: a4c39ed31a8df1dd8bad33f09b895eac48616971 SHA-256: c780674987704bde085f24f9b708bd59eba2436de819e14d579f56721daf1df4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pgp-puh.hr/fck_media/file/lolaxofenedizowom.pdf In PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/xaduzepuladukegizajenula.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/tewosugorujemuki.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/78550682103.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/87849246982.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/4885936379.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/24989861020.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/88199679895.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/jofepofowiwidalavowufo.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/13543095476.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/vosugiromuna.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e1270824b1---niposakovajom.pdfIn PDF document text
    • http://fivelscope.net/fckimages/zimaj.pdfIn PDF document text
    • http://espwireless.net/uploads/file/sipobegujobitunenele.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/fd616d591d0d8f30a1d083752337fad2/pobewobuwejatokab.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/81901888176.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/63988258054.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/nenagararowatuzebeworato.pdfIn PDF document text
    • http://flyingfish-stay.godyouoh.com/userfiles/file/60845033127.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/tadobo.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/xowane.pdfIn PDF document text
    • http://wingtsunkungfu.ro/imagini_ws/gilejolasetelibefubudira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=baptism+of+repentance+meaningPDF 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_off0000c767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC767 19612 bytes
SHA-256: 4350d96198f121e32950d2079400ebaf650ef86b672db86328eea8ef8af8a7e3
font_01_sfnt_off0000f965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF965 10832 bytes
SHA-256: 22f55a01793c8c0007c7f6a1c75b0a4dfb228989a2e45c839aa30106f39ce2f0
font_02_sfnt_off00011275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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