Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e255aaa90e7125e…

MALICIOUS

PDF

81.7 KB Created: 2021-09-23 23:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8de1b1f7029e335542d459f984917be SHA-1: c5a7d52019f0e630e7cdb31f679c4642fd598ca6 SHA-256: 7e255aaa90e7125eac97425907f80e63a44e507f8c1e5a799b04d5f40b562335
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, with a critical ClamAV detection indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed as a link farm on disposable hosting, likely to obscure malicious destinations. The embedded JavaScript is likely responsible for redirecting the user to one of the numerous suspicious URLs found within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://kleni.cz/userfiles/file/58572005078.pdf
    • https://pasationtravellers.com/root/FCKeditor/file/61240147449.pdf
    • http://mgrima.com/files/file/27867175942.pdf
    • https://mentormedya.com/files/83220109822.pdf
    • https://armagedonspedycja.pl/files/file/74907768780.pdf
    • http://wannawwannie.pl/userfiles/file/44978775250.pdf
    • https://getracemirates.com/userfiles/files/tavugufobawotixemugut.pdf
    • http://haisushitogo.com/uploads/files/85988074202.pdf
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/22163381231.pdf
    • http://tks-forever.com/upload/2021/09/13/file/99441924986.pdf
    • https://parisnordmedical.fr/docs/file/kokumafisate.pdf
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/13591437899.pdf
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/fevawat.pdf
    • http://analhospital.net/file/files/pijaxomiwupavipepejoxuli.pdf
    • http://rafaelokazakov.com/file/sogeworabejujewomunasuriw.pdf
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/68322068511.pdf
    • http://fskyok.com/uploadfile/files/8081510791.pdf
    • https://bhsbeacon.com/FCKeditor/file/zemerigelejagigenajuvol.pdf
    • http://kancelaria-perfect.pl/app/webroot/media/files/razefavofufilolij.pdf
    • http://ipayon.com/root/FCKeditor/file/73801730104.pdf
    • http://hidropro.hu/upload/subulaxakasagez.pdf
    • https://psystat.net/candyticket/uploads/page_images/files/losam.pdf
    • http://liburnia.pl/userfiles/file/dobofadokamopijowivufeme.pdf
    • http://longvu.vn/Images_upload/files/77116916603.pdf
    • https://doina.md/fckeditorfiles/file/xabiresevo.pdf
    • http://paneldeconso.com/userfiles/file/pusizaxexugivodijinejoriv.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=sports+tamil+live+tv+app+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9a4.bin
ed5a69836dc0c9f332748a4fb7952217521c8be399cf16742ddfc2305fb62239		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A4 18100 bytes
font_01_sfnt_off0001082d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1082D 16792 bytes
font_02_sfnt_off00012044.bin
26f49e28ab5aa13429592d7261ac3773aff0f6390de885d8da6750c6e996fd37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12044 10780 bytes

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