Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f0437fd784993d9…

MALICIOUS

PDF

79.3 KB Created: 2021-09-07 21:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 13f8453d4c36dccc214b288faadf711f SHA-1: 2b5c0b7c46801128daf0a1e5760d7b02b850ec5d SHA-256: 7f0437fd784993d953a51cd8941dcbb97484835f17930ceb99f049b0debd7768
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many hosted on disposable domains and employing UTM parameters, strongly suggests a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm designed to obscure the true destination, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://krisoc.ru/uplcv?utm_term=convertisseur+pdf+en+word+ilovepdf PDF link annotation
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160701932d2edf---lotijivojabuteku.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/gopulaxir.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/29779968433.pdfIn PDF document text
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/53862377913.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///83893502925.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/puvofa.pdfIn PDF document text
    • https://invest.pl/userfiles/file/kunajufeneduk.pdfIn PDF document text
    • https://preciseenergygroup.com/media/tezez.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/nibux.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/lemaj.pdfIn PDF document text
    • https://anfauglir.com/images/file/49096287777.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/1037457598.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/94637353073.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/refigotolewovis.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/limetifexodaw.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/9389303819.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080592e12eb1---97494186306.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/72110372518.pdfIn PDF document text
    • http://qca.ch/userfiles/file/xilukavezi.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/5412161027.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/30711052542.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/gijujupas.pdfIn PDF document text
    • http://furniture83.com/upload/files/43679522306.pdfIn PDF document text
    • 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_off0000ced7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED7 19108 bytes
SHA-256: 64de9c9ddd56d22b859eb2b8cca5475a97e477a5088f1d4ce516b72ddbff5a58
font_01_sfnt_off0000ff13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF13 10612 bytes
SHA-256: cf5ad2bf5162f65d3135bdd0c3118efa520a5fa914be1812f1feec0c037fcc61
font_02_sfnt_off0001178f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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