Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d7589e8ab34cb90…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 08:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 653e845e1816eb2783e8f386c890daaa SHA-1: 8720bd81f48f3a88113b85608e27aa9bac578dbe SHA-256: 5d7589e8ab34cb90f627a972bbaac45be4f44c2fc1528e47841465d73a35b434
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to distribute malware or phish for credentials. Numerous unknown URLs were extracted, supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://obermeyer-modemarkt.de/upload/file/28915008960.pdf In PDF document text
    • http://phdpecs.hu/userfiles/files/guxetaxub.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee9d119b0d---17786500267.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/70437094774.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c402668a2---20457020978.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/timisusug.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/winasiwawerotaweguvi.pdfIn PDF document text
    • https://ikansambel.com/contents/files/20429022196.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/73006829375.pdfIn PDF document text
    • http://kotolantopeni.cz/file/zagesunimedudukolejipisof.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/8845133487.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/88462414906.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/jusobebadu.pdfIn PDF document text
    • http://health-bridge.in/upload/file/wuxafaporaturipe.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/batageboxelit.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/33735822537.pdfIn PDF document text
    • http://rc-modeller.se/images/file///simuxodurobokitavu.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/wupovunikazutijo.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/56343800379.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1630554338.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/pavizosibaji.pdfIn PDF document text
    • https://klcconsulting.eu/klc/file/40445295868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=triangle+sum+theorem+calculator+solve+for+xPDF 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_off0000d87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF096 11016 bytes
SHA-256: ce8d8b2ae19add299daf247fb373b97d86c46bb2d04709eaec02127c9cd7e729
font_02_sfnt_off00010a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A07 17368 bytes
SHA-256: 4506503ad8621d8dd8d758c462452b8aa2606f8de5cf3fb88f6880c64ff30b8c

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