Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b9deb21b7f8540…

MALICIOUS

PDF

92.4 KB Created: 2021-02-04 07:39:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: cccdff9319c776e36ff60d39c3e4f51e SHA-1: e221b93eee856a1de4cfefc2acef12e312c515b4 SHA-256: 31b9deb21b7f8540b2d44abb318ffd6614f2b49fae13b50786324ce777308b1a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely aiming to redirect users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/aws?utm_term=rcog+guidelines+for+gestational+thrombocytopenia PDF link annotation
    • https://bitiwinelezom.weebly.com/uploads/1/3/1/8/131856531/kawazu.pdfIn PDF document text
    • http://rupekudufim.22web.org/danilibalen.pdfIn PDF document text
    • http://iranianvc.com/safe_4.6_advanced_scrum_master_exam_questions_and_answersjswpp.pdfIn PDF document text
    • http://vulubibobi.iblogger.org/ikea_worktop_installation_guide.pdfIn PDF document text
    • http://zuvels.xyz/dream_car_racing_evo_hacked_unlimited_money3fgbl.pdfIn PDF document text
    • http://misstourist.info/canada_boat_license_study_guideuoc6f.pdfIn PDF document text
    • https://mosovokiz.weebly.com/uploads/1/3/4/3/134333023/5c637611a10943a.pdfIn PDF document text
    • http://aicberg.net/729437886721dy16.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rajokawaxes.rf.gd/59980027442.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/takinujudese.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/angular_vs_reactjs_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/35487736532.pdfIn PDF document text
    • http://naditoliwinudev.epizy.com/water_sports_vocabulary.pdfIn PDF document text
    • http://jipuzekas.rf.gd/meditation_rain_music.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/vanutemadovowigiwirob.pdfIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/11578389956.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/6042216229.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_off000128f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F7 5816 bytes
SHA-256: f7d46cee6b9c0ceee5959d4364489f10c6c3e3c87bf3c02f8cadb4f5d02ac669
font_01_sfnt_off00013caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAA 12516 bytes
SHA-256: da1879b29a8d7374c3f73d3d5876b855699d694794505b5e6193d60ed7674aa9

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