Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c232a9eae2dcb69…

MALICIOUS

PDF

70.3 KB Created: 2021-09-29 10:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 14968be3021c04f7bba1e6751c05c42f SHA-1: 7957bd6aed77428073e6dfa140c9a6a2ebf6fbde SHA-256: 7c232a9eae2dcb69827e4a58d0549efe2489e5e5348a97f2d45fc7cd8c774323
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm on disposable hosting. The embedded URLs, such as 'https://coretry.ru/uplcv?utm_term=ios+14.5+emojis+download+for+android', suggest a phishing or scam lure. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=ios+14.5+emojis+download+for+android PDF link annotation
    • https://akrmedia.no/ckfinder/userfiles/files/23377273340.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/24138250608.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/xopomozisemewowukuz.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/fulevukajidu.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/makuguxiwiwikijuwiluvuz.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/87480524177.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/29981736882.pdfIn PDF document text
    • https://rayvoltbike.tw/geektic/files/mapepuzujulixatikotati.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/86591026613.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/sibunusijezekipibemagoduw.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/51573270713.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/rawilixusuzifirabizo.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/72585488705.pdfIn PDF document text
    • http://ridendo.cz/files/file/fupaxefuvanafevejiz.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/28015960966.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/kotilozoge.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/2016220303.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/xuzekuvewixofi.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/sivemobovuxisujisufijemar.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/sezafamoledogujas.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/6849451474.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/nexuwupofobef.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/motopijaga.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/junadurorav.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_off0000b015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB015 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC827 16560 bytes
SHA-256: 34b49de56efcc7c192ea1574a55b9f024969b64e09b4d102e55afe70668c1677
font_02_sfnt_off0000f232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF232 10916 bytes
SHA-256: 77a7cc3a4bd42a7a0f4ef5d40bab4a85fe6010a9848f40ccc6ca894b7a5d0b8b

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