Malicious PDF — malware analysis report

Static analysis result for SHA-256 18180d7f72d423cf…

MALICIOUS

PDF

81.2 KB Created: 2021-09-15 16:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 908d840167d5deb8df663cc35cbcb2b6 SHA-1: 479473468b8b619f58e54606c900261cc0b954e0 SHA-256: 18180d7f72d423cfc010b090bafcc0f00c9e2ae184caae76c04c2338f0a3314e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, many pointing to unknown domains, which is characteristic of phishing or link-farming schemes. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://beldapin.com/calisma2/files/uploads/mizamedi.pdf In PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/42548760053.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/62082448798.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/50345643099.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/60643551372.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/49132914249.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/33242546409.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/girep.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/41816524447.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/82951133021.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/gekobevozududefobewetij.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/27313392080.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16139f112ac187---84108535074.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109151427003518.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210914041230.pdfIn PDF document text
    • http://itena.si/uporabnik/file/luriv.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/69657200286.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/takawanegagubowa.pdfIn PDF document text
    • http://reflita.lt/uploads/files/60060707678.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/77259379186.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/fidodorefek.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109072358286004.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/36440041297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=android+enregistrer+conversation+telephoniquePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF005 11088 bytes
SHA-256: dd65e5e69bc674848b380dfc71c8acab799e9d19482ce60cc8274fc207e2b56c
font_02_sfnt_off0001094d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094D 17560 bytes
SHA-256: 2a4de7bcbfedc76c565644b6792dd1c07218b63d27ddd1213769ad94eeea01ee

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