Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde9aaee86d85e3a…

MALICIOUS

PDF

68.5 KB Created: 2021-10-01 11:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 711a270dca5ce25216a10de9bd6e6ff1 SHA-1: 2f7bc5c4ad09cbd417c12ed5b7a41cb1cffce79e SHA-256: cde9aaee86d85e3a5d9016acf8cd7cc06de3cee18b5770b745fac83e53814d03
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to obscure malicious destinations or distribute phishing content. The ML classifier and ClamAV detection strongly suggest malicious intent, possibly related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://coeb.eu/userfiles/files/rudatajidezazop.pdf In PDF document text
    • https://vanphongphampmc.com/upload/files/84764374126.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/gexogawonifa.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/35354714100.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/j7tnbg1ku43q8u5bcjt5dgjtlc/xovovujat.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/73907080267.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161476c7f7a881---29890875968.pdfIn PDF document text
    • https://anup.bo/images/files/11223755218.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/79565959717.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/40267726570.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/19676882202.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/3573206516.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/fivififijopimujobode.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/67355007177.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/rugigikawimupan.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gizigavomidasuduzosamuzu.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/75734850663.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/kosutej.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/kopixagepojuvanapawe.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/82730386619.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/60468252573.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=sonic+mania+download+androidPDF 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_off0000aef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF7 15232 bytes
SHA-256: ee4f0f7248e3b9f79866507627b222d66873428bb5d6e3a6b84de05331f67aa4
font_01_sfnt_off0000d566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD566 10292 bytes
SHA-256: cb353307a740de5b96ded422461b8cd5488719737e667842ea2cc0eb29e92558
font_02_sfnt_off0000ec8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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