Malicious PDF — malware analysis report

Static analysis result for SHA-256 503fd0148873f6bf…

MALICIOUS

PDF

68.1 KB Created: 2021-02-23 22:24:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: f0f070ad6751c642d8a50d735f682a2b SHA-1: 7eb1c6587dfb7b2e4eee0cce6f2923ae99180f6f SHA-256: 503fd0148873f6bf398074df240f8008164a9a4628641416cc701151a79625d2
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a phishing site. The document body, though heavily obfuscated, appears to contain product-related keywords, supporting the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=casio+alarm+chronograph+water+resist PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425255/normal_601f3b52e544b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414164/normal_601ca2041d061.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4531523/normal_5fe864e235f51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369923/normal_5fd13522e3f4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504839/normal_5ff3d39da3b94.pdfIn PDF document text
    • http://boost-store.net/427778908152010l.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/cartoon_network_game_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/template_builder_software.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/telugu_hd_movies_sites_list.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/all_android_hacked_game.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/creature_3d_movie_song_320kbps.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_off0000c893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC893 5344 bytes
SHA-256: 4407b7dd510b3fec7e2bc67c8f0bef6fb6767d4bf4a2db8c84b6af601851a684
font_01_sfnt_off0000daa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA2 12692 bytes
SHA-256: 67f65de27c9a596ca262101917b88ae10becd4bd67e84a4fed3f1a5dc723078f

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