Malicious PDF — malware analysis report

Static analysis result for SHA-256 797b74e6c1503aca…

MALICIOUS

PDF

82.8 KB Created: 2021-09-09 16:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: e637117d674d4c9abb47c1f4669f8925 SHA-1: 8ceceefe268198bcc69b680430d942ce5ae1307a SHA-256: 797b74e6c1503aca7de68cd997d6b331c13fa0555738a8374b5149a29598585b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=pokemon+platinum+cheats PDF link annotation
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/7c399fe46f30a37f4479d44ba02e2053/64183881123.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/lidadinewilorogulowex.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/lujejosuxomofotaso.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/68899424578.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/77746996601.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/24706176310.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/vorotegifakajuwufuxelu.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/lofirevanezumaves.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/74559564927.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/sojokoxamunojufugijaf.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/33252951895.pdfIn PDF document text
    • http://ccshecea.org/upload/files/39568077460.pdfIn PDF document text
    • http://hocomesun.com/upload/mepowomorekovanoxobevetu.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pulvo3iva3q5pei231nli13093/jamibutizumuruletiv.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/pebaroputilunimisopidu.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/91035808207.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/4519681332.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/lokoxunixegoburexobime.pdfIn PDF document text
    • https://cmoretv.com/userfiles/sojujotatowudizulirolak.pdfIn PDF document text
    • https://felicityokolo.com/file/45007172478.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/42663174874.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/18110657046.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/lesusiginasanetowatoruv.pdfIn PDF document text
    • http://119pump.net/d/files/xijuwezesetejitogovobix.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_off0000df74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78B 10732 bytes
SHA-256: 89cb3a5665624a780774e07bf6e2138f0fce36d7950c5c75d5487ea38511c51d
font_02_sfnt_off00011004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11004 17520 bytes
SHA-256: 280293a993efef329901a28d660185b6a2bb91d30f2864e0b43fb5dfb9f1813f

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