Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b5c5279d58a901…

MALICIOUS

PDF

71.8 KB Created: 2021-02-12 04:55:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 63e2a71b62d13d9557f5e23ec41dea8a SHA-1: 60c2811b7a5b89bef1f3ee4e6f07d6ff4bf74b32 SHA-256: d5b5c5279d58a901e9d9c2542a63b65465d096ca66fa8bedf172167449a584a8
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one prominent URL pointing to a site that appears to be a lure for 'level e unit 9 vocab answers'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous links to disposable hosting and S3 buckets suggests a broad campaign to host malicious content, with the primary observed URL being the most direct indicator of the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://bologen.ru/wix?keyword=level+e+unit+9+vocab+answers PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kizuwopo.epizy.com/chrono_trigger_endings_guide.pdfIn PDF document text
    • http://vugapadilubokis.epizy.com/business_report_writing_course_outline.pdfIn PDF document text
    • http://dufogatate.epizy.com/ginirosunozez.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/danuv.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/sublime_format_xml.pdfIn PDF document text
    • http://mojabumenir.epizy.com/vabaresubimokefabunuwatas.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/miss_universe_2018_final_answer.pdfIn PDF document text
    • http://jekabuwof.rf.gd/backtrack_5_manual_espaol.pdfIn PDF document text
    • http://zosejanukapub.rf.gd/descriptive_grammar_of_english.pdfIn PDF document text
    • http://guvamimifufirar.rf.gd/38808825425.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/juniduxurabatavivabexa.pdfIn PDF document text
    • http://wuwovedivaz.rf.gd/14721693949.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/pexezisezulija.pdfIn PDF document text
    • http://baverasoge.epizy.com/boy_scout_merit_badge_medicine_worksheet.pdfIn PDF document text
    • http://lunufisisosixi.rf.gd/pesazezeluwowozinexolab.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/compress_mac_os.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_off0000dbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDD 5180 bytes
SHA-256: ec536bacef19d4f89dee98b8ba0919d3b1dcefef87a6d6b5398a677fbe8270a1
font_01_sfnt_off0000eda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA3 11456 bytes
SHA-256: 42615c24f7cc410e7dcf81a6025cfca383343d6e90fe1cf6e62807d73c662785

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