Malicious PDF — malware analysis report

Static analysis result for SHA-256 008e9a5e510f8f20…

MALICIOUS

PDF

70.3 KB Created: 2021-09-22 23:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: da3a851fabd6655293d2506b1dccf34b SHA-1: f3f028ee76dd1a0a19c2ff17fd2c10ef04a6db8b SHA-256: 008e9a5e510f8f207454d980acfada81283f38f5f61b6ada10a40625c71fedc0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users to potentially harmful content. The presence of these URLs suggests an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=private+account+viewer+instagram+apk PDF link annotation
    • http://pkynfe.net/userfiles/file/64431915167.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/fibufunu.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45336191487.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/tavopabuduradu.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/59820991668.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/30479807002.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109130648196570.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/kulojugitekig.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/79686888144.pdfIn PDF document text
    • http://temple.mo/userfiles/file/80904457256.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b4d2d59e1---21512929206.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/wusenesudupakikol.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/59703531078.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/98692273722.pdfIn PDF document text
    • http://advairtech.eu/assets/userfiles/file/mufoserajugo.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/dixokub.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/migir.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/18500040531.pdfIn PDF document text
    • http://www.memoriahistoricamalaga.org/ckfinder/userfiles/files/zipoxebule.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/damonajiruv.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109201246296343.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_off0000b3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D7 11016 bytes
SHA-256: 667dea3c1d6f306caf8640700ea27e78a8dbc210d38365ca30db5d4fa86c7596
font_01_sfnt_off0000cd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8F 15192 bytes
SHA-256: 6b5f98c4e2f5ef6e150fb4a740c051b945adc11bd5269d2054a85a6f30f78886
font_02_sfnt_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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