Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc84bd4276c543e…

MALICIOUS

PDF

97.3 KB Created: 2021-09-13 18:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: ae6d997540673e9facbabdcbb1f7fc45 SHA-1: 61522174e5582d47478d49513aa6f43ad11b553f SHA-256: 4fc84bd4276c543e3014c832ef865251db4b6115bbc8d981bae4cc2344aabcfb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://smidgel.ru/uplcv?utm_term=how+to+root+android+9 PDF link annotation
    • http://www.ciesol.com/ckfinder/userfiles/files/wizaso.pdfIn PDF document text
    • http://china-miyaco.com/img/file/2021911195722.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/23692037211.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/17432888057.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/91861145216.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/4881707877.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/38431861918.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/93962172137.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/78123449770.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/22540387660.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/ludivosolu.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/63815754628.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/53701529392.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109020318414367.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/97451781997.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/jasubugowe.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/bodisanexudiwonegopureze.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/80889432589.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/mizudawagesuxugez.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/turexagukijadumarosijeg.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/rotanedakujixejet.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/73749354036.pdfIn PDF document text
    • http://hla.vn/upload/files/82972542943.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/kixobuguxegevemusawamu.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/tawawomumanivotode.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_off0001161f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E31 19396 bytes
SHA-256: cbb253db688dfb0cea369a517ffa6020b34a30effd8051a6c056ddd96c49d6a2
font_02_sfnt_off0001609f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1609F 10140 bytes
SHA-256: 2f4d4bb644cba67cdf8e30adfcfc8b26be56065df5ee6371c108959fd9f2525f

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