Malicious PDF — malware analysis report

Static analysis result for SHA-256 8774ed042e5d25b1…

MALICIOUS

PDF

73.8 KB Created: 2021-09-13 16:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 89384aa51e5c22dd3d7c3f7e67c1e1a8 SHA-1: 36386e07ca327b86b004fc08620d444727ece3b6 SHA-256: 8774ed042e5d25b10d2c0b8e8c032467bfb0785f5c0f87df5b0b1079bffcfcbd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to malicious sites. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://pistant.ru/uplcv?utm_term=next+launcher+3d+shell PDF link annotation
    • http://akwarella.pl/user_uploads/file/puvoju.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/dapiguguzabatedabewadusaw.pdfIn PDF document text
    • http://hueide.com/upload/files/36007602000.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sazepopuwatozu.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/6dcd81fd588316cdbc771c92ff90e3f4/nagujodulotani.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/61850134335.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/fizezinad.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109121104425443.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/98433418927.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/33539965680.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/97355735865.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/tupanelivufexipowuxonoxev.pdfIn PDF document text
    • https://12shio3.com/contents/files/tifavax.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/89912462839.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210905130040_vbiasa.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/91428001485.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/mezarugasuzixewizadixoju.pdfIn PDF document text
    • https://isosklo.cz/uploads/tefemuke.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/dofabi.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f5c85115d---wapowafitivevofa.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9279154815.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/zedad.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_off0000b45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB45A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC71 10608 bytes
SHA-256: f086bea40fe9910707b8e38be6f68256091dd979bd321fb18eea15a071b6c364
font_02_sfnt_off0000e4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B7 21988 bytes
SHA-256: ca1570a8cc994357efbc7846c3b9da92290567711967935cfcd6046344e61242

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