Malicious PDF — malware analysis report

Static analysis result for SHA-256 958d0d4263823d17…

MALICIOUS

PDF

68.6 KB Created: 2021-09-28 02:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7e4c10db0dc28f175d1b9be0d0c821bb SHA-1: f679db7b527a04a6999339973ed4875c7240d7a8 SHA-256: 958d0d4263823d176be49c62b01f07eb46435c2468ee9d631c7acfa3c3da1ce7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies the document's structure as a link farm on disposable hosting, reinforcing the phishing or malware lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crewmak.ru/uplcv?utm_term=yeh+hai+zindagi+south+movie PDF link annotation
    • http://kuhomania.ru/ckfinder/userfiles/files/16658483107.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210924_3D80A50F420033B2.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/vitenuvusuverilebepe.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/zosuvumi.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/78708301046.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/pagipu.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/27030004009.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/97156531312.pdfIn PDF document text
    • http://riph.pl/userfiles/file/29249355003.pdfIn PDF document text
    • http://irfanmakina.com/depo/sayfaresim/file/sigorekegafega.pdfIn PDF document text
    • https://lesura.net/userfiles/file/42153064068.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/48278364612.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/vamogujer.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210920231606.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/fazavinevelategijolitid.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613158162c3ac---23085732062.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/22643429599.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/31923269202.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/99775248827.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150258bdb6e0---39752666039.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/84442889926.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/jugivudixerizavuxanifujob.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_off0000aecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAECC 14896 bytes
SHA-256: 88163e547b2fefde142ff44ad43c52358eb40d23adac7db92b1251be4c8e37f4
font_01_sfnt_off0000d479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD479 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC90 10756 bytes
SHA-256: 1bca6e6de88e6b6653a0b6e7582616f786e20e03d3857c9adee7ad1afe4d4ce5

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