Malicious PDF — malware analysis report

Static analysis result for SHA-256 97955263607f83e5…

MALICIOUS

PDF

82.0 KB Created: 2021-09-19 00:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4e1c22e8e41b6e4fd2698f4f42275025 SHA-1: 4fd783e13a0ce6fd843120af5185348e3d9dfba1 SHA-256: 97955263607f83e5396bea04184da8fc1f423dd25c8b1b462955ebdd5b2c5bc1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The high number of external URIs, many pointing to disposable domains with UTM parameters, strongly suggests a phishing or link-farming campaign. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=sao+progressive+manga+pdf PDF link annotation
    • https://accu-split.com/userfiles/files/95745164304.pdfIn PDF document text
    • http://hejia-ele.net/upload/8858623480.pdfIn PDF document text
    • http://artediapharma.com/upload/files/39787861932.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/mutisekevebakexawegu.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/mabenadipej.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/20808078652.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/xonanafo.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/sefivadegan.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/fugesavozodo.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/73935924112.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/35632191388.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/dutololal.pdfIn PDF document text
    • http://01host.ru/userfiles/files/misuzaxiwajogif.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/84496772453.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/nufur.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/bosir.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/feralukofixawu.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/jufimuwemelenujeba.pdfIn PDF document text
    • https://matricula.arendic.cl/files/bixurinedosabo.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109131925566290.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/navetoko.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/65991194846.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139861e4f4ba---41941702102.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/qiopaav30911hsech5h97pt2c4/ripapuzotatoziwanopixol.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_off0000d4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AF 10840 bytes
SHA-256: 878b698043471030bbdcc1326370d0faccd543696a9557c7f41f6fb27af71351
font_01_sfnt_off0000ed73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED73 20040 bytes
SHA-256: c577cebb5a6e4dc1792ce4e04c9361811eeedac3dad11e560f4d5a0b99c849d2
font_02_sfnt_off0001221d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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