Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ab70edc2bfa0b6…

MALICIOUS

PDF

89.3 KB Created: 2021-09-22 09:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 401ef57422e74ccb516d95d2164fe709 SHA-1: 46d12995c602d3364c8e500c6a1881d0ca5f0372 SHA-256: e9ab70edc2bfa0b6676e533c18f9aea26a0e563c838ea474968d8eda2e9a0c5b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior, suggesting an attempt to lure users with promises of game downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://huntic.ru/uplcv?utm_term=download+game+fps+offline PDF link annotation
    • http://vikingpaint.com/user_file/file/21208731934.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/51251550071.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/tatufawuwowofamatavopufi.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/3007063519.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/92312157163.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/30115951627.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/worowelijixuvafeva.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/napixixaxasipolitopet.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/76249324031.pdfIn PDF document text
    • http://medica-brno.com/files/jodudowezufodebili.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/56796389931.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/zugomiwunupazig.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/wigif.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614267e7df0e3---41974001669.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/robubigefuvopovaka.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/65673912404.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/72616221892.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/mewuratujigadifa.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/lutezizijexo.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/76128859684.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/29757635044.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/47624802280.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/39158547199.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_off0000f95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001116f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116F 17892 bytes
SHA-256: 967a1f2929ff8277fa56217f2cc1605471d4881baaa943e8a0d73b3930fd5355
font_02_sfnt_off00013f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F7D 10732 bytes
SHA-256: cd0fe26817372d0ba128712cceaabb1d7b2eabc4d3a02dda8a7d3ac4970d9cbd

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