Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b8d3db05159d28…

MALICIOUS

PDF

79.4 KB Created: 2021-03-29 16:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 953d1420e8215fd0c6d49ec34cbd2b2d SHA-1: efa0ca6b5c594763921c6d7a8b8f9eb2d9326aeb SHA-256: b4b8d3db05159d28b146ecfda5af1b8dc5357c1f0f823f27304624972045106a
96 Risk Score
Tags
free-cdn-ebook-manual-lure

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 'kuzutuzo.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to 'journal citation reports'. No scripts were extracted, but the presence of external URLs and the malware detection strongly indicate a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/123?utm_term=journal+citation+reports+2018+sociology PDF link annotation
    • http://winoorama.space/is_there_a_fuse_for_your_car_heater0rp4w.pdfIn PDF document text
    • http://firstsecu-paypal.com/semosose5qbdb.pdfIn PDF document text
    • http://dusefibesix.iblogger.org/human_heart_anatomy_and_circulation_worksheet_answers.pdfIn PDF document text
    • http://everydays.space/best_class_to_play_solo_in_diablo_3l1k8t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379477/normal_5fdd89b8c7d16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467298/normal_6030f614a5eb4.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/tinajabizoreguf/kubegobuwusigebov.pdfIn PDF document text
    • https://s3.amazonaws.com/xofalepelala/30322256350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d53c97e-b32c-4a5e-9e01-cbe8bf94e8c0/pukeketavefimisogiloda.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/bepexobaguja.pdfIn PDF document text
    • http://vomogowejupilu.rf.gd/xexin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75315f8f-9908-448a-b6e9-ca7f7bcb3eac/81037011009.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/fozabopubif.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/6880651837.pdfIn PDF document text
    • http://rulakilelakeze.epizy.com/motorola_cp200d_price_canada.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_off0000f497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF497 5712 bytes
SHA-256: 0ffb7fac475f6d62634a6f04c7c4c215765f6623fd3fb89ce51e70d03fc87163
font_01_sfnt_off00010823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10823 11824 bytes
SHA-256: 610718394f615e7e6b39e0317ca0a3130d211960fcde84c9cf86a3d92a5847fb

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