Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e9af90454eb4d35…

MALICIOUS

PDF

78.2 KB Created: 2021-10-04 15:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0168e68835a149f60131f93a123c02d1 SHA-1: 3c3bdecdafa7714a69344ca76be9a330b3694af0 SHA-256: 5e9af90454eb4d3559c597c540e41eb054343dd9d664b495ead6b2165ce44f70
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which host PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this being a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware via the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://livresdarts.com/ckfinder/userfiles/files/livumaduzovafidut.pdf In PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/golopawi.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/mugibozemomemarixuk.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/73137758616.pdfIn PDF document text
    • http://malifer.hu/upload/file/vugajijofuguzizusid.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/wamesixowulenaxo.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/bukedaresufedunab.pdfIn PDF document text
    • http://pnalog.ru/images/file/segitibateno.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/42116980561.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/22249374433.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/e246c1061ef05764abf4a248cca30934/24269210530.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/niritinirujelali.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/86799304686.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/xuxibode.pdfIn PDF document text
    • http://benetalent.com/upload/files/48617146641.pdfIn PDF document text
    • http://foxadv.net/file/rexufoniwaxufuval.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/kikuborus.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090407462173499.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161384ea3dfe8b---24543032479.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/6022295754.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/56110820131.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/nobonimapuboziwutera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=environmental+communication+and+the+public+sphere+pdfPDF 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_off0000cb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7F 11172 bytes
SHA-256: f2fef1dedfbacd87583f137bada5c0416403c9accd6463f27031a4043e9f3e08
font_01_sfnt_off0000e52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52B 17552 bytes
SHA-256: c5ade90fb3c6ebb14462f484562c20d8bf0edb23af539cb3cd911c61358e6f05
font_02_sfnt_off000112be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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