Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db8fff9be279d65…

MALICIOUS

PDF

68.7 KB Created: 2021-09-16 08:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5b0530f34f513293d2c670d795f799f5 SHA-1: 0c66de53a7ed9edbe8b7d91632db0433da091eb6 SHA-256: 7db8fff9be279d651c0eefe0e6a1842da0d59013c87d1be9f5ef8a3713449f4d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=polar+beat+apk+download PDF link annotation
    • http://yanartextil.com/firma/files/doguxubemi.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/72010251732.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/ninasuw.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/01d9d085d193018d142bd43f7952cb6b/97533366771.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/74912171902.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/51048244454.pdfIn PDF document text
    • http://saimiri.name/upload/file/mivunodewuxe.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/60025577439.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/6540473746.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/35507469805.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/26837603710.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/13896617079.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109010429013739.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109092053439465.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/49373548192.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/muzojodurubigugakimi.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/55412144930.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210915140545.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/33238751455.pdfIn PDF document text
    • http://surtek.biz/image/files/20150331_151604.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210905115655.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f368030539---sazidorilotagovixikow.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_off0000ac9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AD 15484 bytes
SHA-256: 9d3833495477fe3e024428c420dfb36ea1725ed3675cfce5e4f4cc394c54d686
font_02_sfnt_off0000ec71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC71 10444 bytes
SHA-256: eeb075c6eb7307f1964f1a74b5ee2a8b0640bb900a233d0628c34570d3794537

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