Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52bcb77d964c9d7…

MALICIOUS

PDF

79.0 KB Created: 2021-09-18 23:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8cd2b6a2b00f062e3ddb356aec446305 SHA-1: 7a036628388ddd1605e47e388936543452af278d SHA-256: c52bcb77d964c9d7b6d93c7517ad6d1c90cf905a1d149545e76b3c137f1c5b92
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to suspicious domains or are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://www.area-tlc.com/public/ckfinder/userfiles/files/54504725082.pdf In PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/zinufenorizapi.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/25964664689.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/42380695417.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/66343519091.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/ruramojolakotapiwowiguzaj.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/86655824506.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/80128383539.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/6907184339.pdfIn PDF document text
    • http://trinitysportsandleisure.ie/userfiles/file/wofoxakufi.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/44741711719.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/43820743844.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109080406527046.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/lokavimexesomozigir.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130db152c4ee---92959096109.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/11909404172.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/37586691596.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/83986134985.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630530214.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/48012934333.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/ravijegonuvibofi.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137ff46c0ea4---sakikoka.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/76335349472.pdfIn PDF document text
    • https://belretail.by/ckfinder/userfiles/files/zopakososulanelonuxuxag.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/bubekinifoduruzixakevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=%D0%B4%D0%B5%D0%BD%D0%B4%D0%B8+%D0%B8%D0%B3%D1%80%D1%8B+%D0%B4%D0%BB%D1%8F+%D0%B0%D0%BD%D0%B4%D1%80%D0%BE%D0%B8%D0%B4PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB331 20664 bytes
SHA-256: 5c636eb1f4b9c8768fd59768a4b2f9d143e6a46734dc7518a6d2492d44f7f5f3
font_01_sfnt_off0000e63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE53 10364 bytes
SHA-256: 303d5e3d0afcc4c79778f1b98cc38757eb7765d6d51277660184a9cb25ef5b94
font_03_sfnt_off000115ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AC 16252 bytes
SHA-256: 0295fde54f33375e71b312635bb5aa3d847439f716fa23b213b1a2a317692eea