Malicious PDF — malware analysis report

Static analysis result for SHA-256 254f36fe7db67a89…

MALICIOUS

PDF

82.7 KB Created: 2021-09-08 21:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bc2c0d75a7e0d11779a4ebd35665ad81 SHA-1: afa30ed41840b16919739553840a8dbe6cf034ef SHA-256: 254f36fe7db67a898647e15f40bddbd4a337f5122954af0f961d0158db36374a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple unknown URLs were extracted, suggesting an attempt to redirect users to potentially harmful content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://pastadimatteo.com/ckfinder/userfiles/files/kagisa.pdf In PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/dujulud.pdfIn PDF document text
    • https://turbooto.vn/upload/files/29512030729.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/jesapujo.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/nejokeguwewevu.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/musafazarabufefisu.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137b3eb02215---mokaj.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/pekozejejurosudok.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3e028bd5d---vozemowojafuweb.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/19781821447.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/ruzuxufibedoradipu.pdfIn PDF document text
    • http://balalajka.nu/media/lopunirezexebutebajikuz.pdfIn PDF document text
    • https://makenie.com/upload/files/25818720379.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/biwifojumexijajorofab.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/73474587384.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/34169535168.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16305193386756.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/rugejozomudojukut.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/vadujataguwagas.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/69797516929.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/newasoratomalewemebaridit.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/20226339785.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=kamasutra+illustration+pdfPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/35103729893.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_off0000d8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B4 19200 bytes
SHA-256: 8599ed79e356d5ac9bc1b92342a436d090b9829959d2423913205e15ca129a44
font_02_sfnt_off000122f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F5 10620 bytes
SHA-256: 6425f9fa8813f8f56103ad84016f968b2257a07a163f7b5d6de310a69a408cd7