Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9553580d87ae80…

MALICIOUS

PDF

82.3 KB Created: 2021-09-10 17:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6ea8f10d4777aca1d256826a3fa653c5 SHA-1: 463daaab5e5b70156b01cbc6823bd1f1a2cdfcfc SHA-256: ff9553580d87ae8045642a6aec18f9f3a05e41b3ee39c81b82ceb297b684ac26
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically points to a link farm strategy, and the presence of external URIs suggests redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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=a+quiet+place+1+free+online+stream PDF link annotation
    • http://laulumaja.fi/ckfinder/userfiles/files/rukuwapulevukuvisuvir.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/9929737243.pdfIn PDF document text
    • http://artio.pl/files/files/xubapunelasixa.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/11337484894.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/65267871470.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/natubaxabodanu.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/marurixizu.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/fixemefizuv.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/fizuragogunoditefidesub.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/60018448826.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/zezuxaburuxam.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/31581196901.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/57888849678.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/60263198045.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210910000855.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/punir.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/18645486403.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613414cd6cad8---nuviwonanojiritiz.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/peregakusamisefuwenux.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/zulidonegafopo.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/51944594278.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/titukugutam.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB06 10920 bytes
SHA-256: 18013da01bc3d63e5f9668b2f5cede97553ecddacb42a7a8bfaf4107ec020d6a
font_01_sfnt_off0000f45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45A 18552 bytes
SHA-256: d683516e1eb88a3a8eca2fcde9bc93e1254a3ee6fc724abd71e0a3c1d3dd36ab
font_02_sfnt_off0001240b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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