Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd9ac04a9d40693…

MALICIOUS

PDF

67.6 KB Created: 2021-10-03 23:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4cdc6d7348e6da51fd81e1ffbf8a6297 SHA-1: ce716d8c9f2de98be2ee2da67769459e5aba69fc SHA-256: 8dd9ac04a9d4069310bc3203ba89e4a68910dcaba30fb860fe49ea54ddbbb182
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains, suggesting it functions as a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://rais.bg/uploads/file/zutamexolujomi.pdf In PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161379e3e65996---50300834568.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/40574715292.pdfIn PDF document text
    • http://splogservice.ru/content/files/nobexokap.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/nelewovipokipetib.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/132933932561397e7e67060.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/98415601885.pdfIn PDF document text
    • http://gestioniarmatoriali.it/laveg.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/gupagizulegig.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/20905180874.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/94148511926.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/badekewarib.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/nogoza.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/xalane.pdfIn PDF document text
    • http://ccadl.com/files/20210901170748.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/futozulofuzunanarurezob.pdfIn PDF document text
    • http://stefani.cz/fck/file/jedivovoduwo.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/jefeto.pdfIn PDF document text
    • http://iscelenie.info/files/file/kumozasuzumipemawu.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16147be2d4104d---77023541522.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/29263645064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=idylis+air+conditioner+settingsPDF 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_off0000aa1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC230 14832 bytes
SHA-256: 3717fa9c67bfecac63b0ca37cf4a3794c7973a0f2a53b58cb69ade30a88db2d4
font_02_sfnt_off0000e795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE795 10612 bytes
SHA-256: 03f940a90ee9919f598099320c5e80a9aaddb286ef6892b0492aabebc48cde66

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