Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dbe222230a69499…

MALICIOUS

PDF

80.4 KB Created: 2021-09-13 09:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7832b53e7b502f52aae7da06b7e79eb6 SHA-1: bbc2057acfbc4bfec7181d6ecd32118a95c85b85 SHA-256: 4dbe222230a6949951ae8a916e33b269e4fdc2f6c6adabf7edef79315abd5b33
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external URIs, including one that appears to be a lure for a game hack, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://garglob.ru/uplcv?utm_term=dream+league+17+hack PDF link annotation
    • http://villkasz.hu/editor_up/rasogekaxedobalegidi.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/96350727968.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///30945360248.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/dazusapeg.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/vamelo.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/14749677845.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/27896949600.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/rowuvebemumaxesen.pdfIn PDF document text
    • http://potlista.com/file/files/95897119214.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/povofefasikok.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/49599108991.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/94976734650.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/58658755919.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/lujarataxesafirum.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/jubara.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/27644598045.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/70278424427.pdfIn PDF document text
    • http://zenkatsu.dk/files/fovilafobamoderup.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/19327679296.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210911_194906.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/temefipuzup.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/72324895810.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/9205754989.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/vulapezamigaxebap.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_off0000d562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD562 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED74 18148 bytes
SHA-256: 1112d3449f597a360c6a8315dcdae2abdeef6ee208150e9d39cb881ddb5b8255
font_02_sfnt_off00011cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC9 10388 bytes
SHA-256: 36517fe9958dba0c330f47a292e2f14af6f2cb441aca1786af95a640fa6b5a30

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