Malicious PDF — malware analysis report

Static analysis result for SHA-256 052ebc7338f3af0d…

MALICIOUS

PDF

119.7 KB Created: 2021-09-17 11:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2c8398987d830300db772f029cb87d46 SHA-1: bde896e61b01addfbfbc96dc94f5be9a9777dd08 SHA-256: 052ebc7338f3af0d4165319d55fb1f2b80d528ea7180321cbeb991470c447a7a
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=miui+12+redmi+8a+global PDF link annotation
    • http://ylplj.com/ckfinder/userfiles/files/43543397810.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/15406573486.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/96643994890.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/63941080824.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/beruxaroravonutaso.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/95040351420.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/8256763445.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/59822707503.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/tunime.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/lamuzolafakulidide.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/lumelifipogab.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/weforupod.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/pegipofe.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/15121867580.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613042e9efd83---supuvudijago.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/8397565c372c6e9cfe7346fa33ab48d5/wivorejemipitu.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/54004587235.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/85031345680.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/22754955185.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/dekanimuxiwam.pdfIn PDF document text
    • http://b2cdemo.tickets.com/content/files/43399237393.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_off00016dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DCE 19268 bytes
SHA-256: fb645c05e006d96b25a2649cdfa0c467ccadfb9c572ece20cfb6b62cf0cea35c
font_01_sfnt_off0001a047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A047 10832 bytes
SHA-256: e1d02a7304febad239455bb6590d8379d6aa97cab2681d34ae7fc5b29763d553
font_02_sfnt_off0001b925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B925 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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