Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5efe045a6be41eb…

MALICIOUS

PDF

78.8 KB Created: 2021-02-16 19:56:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8aab956e9cb33673571afd238a19ae23 SHA-1: 21e04738e39af30dd1c6f484b8013835746808ac SHA-256: c5efe045a6be41eb3147604b2e792858dd2428b54a57526de6a1654a05472712
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=learn+python+the+hard+way+pdf+reddit PDF link annotation
    • https://cdn.sqhk.co/giganopof/pPgiXyc/nicole_sky_squad_videos.pdfIn PDF document text
    • http://reactivaperu-2020.com/temporal_convolutional_networksgi0mm.pdfIn PDF document text
    • http://filemarker.store/advanced_and_multivariate_statistical_methods_6th_editionycjvv.pdfIn PDF document text
    • https://wugumelejemumaj.weebly.com/uploads/1/3/5/3/135324079/8516517.pdfIn PDF document text
    • http://klyshsheff.xyz/detailed_project_report_for_townshipu5w1l.pdfIn PDF document text
    • http://floradoma.net/badrinath_movie_tamil_dubbedrdryk.pdfIn PDF document text
    • http://bcipreactivaperu.com/88383512928c4qom.pdfIn PDF document text
    • http://aycotoro7.xyz/ucsb_environmental_studies_courseslduqm.pdfIn PDF document text
    • https://cdn.sqhk.co/nepopagugela/fhgVDie/blue_heeler_lab_mix.pdfIn PDF document text
    • http://luminar2-download.xyz/allcast_premium_apk_1._0._0._7uvddq.pdfIn PDF document text
    • https://cdn.sqhk.co/dodufiruw/hjdkicN/tukekesuruwojaxape.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/s3jfpgd/jimolasil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pudubekij.epizy.com/kruger_national_park_guided_game_drives.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/kawinagapaxobi.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/aligarh_movie_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/messenger_lite_uptodown_apk.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70A 5056 bytes
SHA-256: 985e7e0d92ae4590d685b3182d9d27d67d032b4c53b3ae9c3e7f4d3fd570ab9a
font_01_sfnt_off00010853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10853 11056 bytes
SHA-256: f3bcda04065bd972f1cf0594a3ecf7c03f53f081e0de866459616275a7c65773

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