Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6324bf3dc8226bf…

MALICIOUS

PDF

81.7 KB Created: 2021-09-14 17:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6ef3563db755627a793b1d113982a8ce SHA-1: 8d60dde014010e51c1e81feb70e94aeb7118ce4e SHA-256: e6324bf3dc8226bff259874f69c283022450a81ef309e972524900862c7cee04
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high likelihood of malicious intent. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution document. While no scripts were explicitly extracted, the PDF structure and embedded links point towards an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://17njl.com/userfiles/files/72537200950.pdf In PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/5c5625a56e91f11b0cbfaa41c6b40c0d/35418789552.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/gajogin.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/fubunatusuwoxifamimer.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe0a27566---24643001127.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/57386941924.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/fixedubiraturidito.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/pinukufojawumuwopabopumu.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/fodabise.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/vakig.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/pavakavumusowuzapizije.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/bobelixisejolokugepufeg.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/duwefaviletumerozanow.pdfIn PDF document text
    • http://weldingplaza.com/files/file/napabejavid.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/77648667195.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/xegizijefewimuj.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/bogurovebepatimin.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/lekogobukazus.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/32142912181.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/xosanusometewezejugexen.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/88757538553.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/motepenuvejifavinapela.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/15894105678.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=descriptive+words+that+begin+with+the+letter+ePDF link annotation
    • 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_off0000d82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82A 18452 bytes
SHA-256: 2088b39707367f24c65290bb2a5ebbd4c71379513c1a7dddaed3315ccfbada26
font_01_sfnt_off000107e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF7 11088 bytes
SHA-256: da847512782f5bc7a654421443a239366edb88079296d8338d53fc404b4c9e0d

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