Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d23ff37d5af0e0…

MALICIOUS

PDF

69.6 KB Created: 2021-09-16 09:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bfeb66b5e72ad1c88b0a3364ab75c55c SHA-1: 7357f73b9f7342fac2e7508ce2c23afd7ada89c0 SHA-256: 85d23ff37d5af0e0658379c884101fd3be261dba7a10accb2549140f02df0fde
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URLs, suggesting it functions as a lure to phishing or malware-hosting sites. The presence of embedded JavaScript, though not explicitly detailed, is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=the+rock+jungle+film PDF link annotation
    • http://mgocsm.in/userfiles/file/62540201477.pdfIn PDF document text
    • http://terrietanaka.com/library/files/70782178565.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/36879932745.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/jemokabegavonivumabom.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/34034867942.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210916062325_bG9idXN1Z2l6b2Jvd2VmaWdvZG8=.pdfIn PDF document text
    • http://zenkatsu.dk/files/nemigapu.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/8ea7f5a5391d8fce78818e437e46274d/bososodojefifo.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/kevowusuzigowur.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/mimelimive.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/fubusekogalomas.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210909_653603E348AD0E6E.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/83958553160.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/venuxawufetakasiged.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/zuwilatumefukifafixekajig.pdfIn PDF document text
    • http://xhzhengli.com/upload/66818547469.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/rivunatuviwemiguzu.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e665eaceec---81493654477.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/63040608271.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210906_9A8467195072E469.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/disumaguk.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/muxezeziruzuzufo.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_off0000b0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A2 10640 bytes
SHA-256: d7fe10b28f7889a2c5ae811146a59e018cfa6843fbfe62781d7b827900f43de2
font_01_sfnt_off0000c8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D1 15860 bytes
SHA-256: 89e95c7da73f6f9cb361b627ac8f0e0c225c461092071f36e31d366c6a44ca5f

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