Malicious PDF — malware analysis report

Static analysis result for SHA-256 da784ea970dc5629…

MALICIOUS

PDF

81.0 KB Created: 2021-09-09 01:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 03501adc4499cdf43dd08bbaeb420765 SHA-1: 3095ddb50fb07328d292931400ff7442d30a4b07 SHA-256: da784ea970dc5629f9352ed674f804fc04134e7e0dacdba36394ba335aaa182b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The sample's purpose appears to be directing users to a network of sites, potentially for SEO poisoning or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/dumosigikaviwifezudogum.pdf In PDF document text
    • http://technimexvn.com/images/ckeditor/files/47284449211.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/80809039702.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/jufiv.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/dekopabikoxiti.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/71384731683.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/dixajimugigulavozebusabo.pdfIn PDF document text
    • https://digireg.cz/upload/zudafuxododevoriro.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135fca7b6cc2---doruzujironotovikuzavufil.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///bezemivufogatokokulejeb.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/zotobakagadowoxikasobira.pdfIn PDF document text
    • https://nomortiga.com/contents/files/13886367449.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/15670930281.pdfIn PDF document text
    • https://servicepapik.ro/files/74580395615.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d4454460b---31598769415.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/92870203230.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/34630690559.pdfIn PDF document text
    • https://ka-base.no/images_students/files/fonidumo.pdfIn PDF document text
    • http://hexindechem.com/upload/files/60368920435.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/71360260472.pdfIn PDF document text
    • http://espokebar.com/uploads/files/54958943513.pdfIn PDF document text
    • http://www.peltonfell.org.uk/ckfinder/userfiles/files/64313000107.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/79568865151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=foundation+profile+midp+androidPDF 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_off0000d751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD751 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF68 10568 bytes
SHA-256: f7da4fa29e39570a91e7ee7c664fd9e30839faa24837922046e9cae3c25a9001
font_02_sfnt_off00010772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10772 17952 bytes
SHA-256: ac6504bda71a412923c3a7f852ca3a089d4b06adc14a44797492b07fd38bc16c

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