Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad2026cd3fb40741…

MALICIOUS

PDF

72.7 KB Created: 2021-09-23 06:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: afd6651698d97669709a37e24fc2fa0d SHA-1: 24bb59c3f904b5e987f188a39b7b6d4135ac7418 SHA-256: ad2026cd3fb40741618e09d2e40a1ca8411067449fb64d2570703877ce77d122
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF structure and embedded content are indicative of a phishing or malware distribution lure, likely leveraging an exploit to execute further stages.

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://reicar.dk/userfiles/file/89557482444.pdf In PDF document text
    • https://exihomes.com/userfiles/files/galapatafuwejamuzu.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/kubanukivigodomedalejisok.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/soloxodirixemijagu.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/mavasisofun.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/46676919135.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/16520809504.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/47848948378.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b67e114bc1---40835501028.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/ruwuvalapefutun.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/5659125525.pdfIn PDF document text
    • https://asiapharma.la/files/files/82921582520.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/xudagezovoke.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/nebotapupuma.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/wexuli.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/2869692980.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/pedonobapupadexagimenabil.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/66338388201.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/vogonexurobejo.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161361dd9d07db---popeso.pdfIn PDF document text
    • https://angkalaris.com/contents/files/bakunakifufag.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/mefonisiriradudufej.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/8670032666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=pokemon+platinum+100+catch+ratePDF 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_off0000b9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E4 16724 bytes
SHA-256: 3aeb09ae0c74e83949931c59098f8ad729a54c9dc2dc46e1634eb3224571d9ca
font_01_sfnt_off0000e4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDF 10836 bytes
SHA-256: 32bdbb4ef175da8cdec4104f27cb9ecbc9daf71b05c54efc49f9400385bbead5