Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2b263ba7c99350…

MALICIOUS

PDF

69.5 KB Created: 2021-01-22 21:14:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9519a3021c362655786d4b5634c0abde SHA-1: 7030ec1a4d694dd77eb67fe13390d603ed3675ab SHA-256: 5f2b263ba7c993508abab0a2aaba3bd90d10439a2479ceb1b5ebd6d88850f5f5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting services, and one specifically uses a 'dangerous goods storage victoria' term in its UTM parameters. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or scamming purposes by directing users to potentially harmful external sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

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 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://trafficel.ru/123?utm_term=dangerous+goods+storage+victoria PDF link annotation
    • https://cdn.sqhk.co/kipebakebe/bahfRji/38435480602.pdfIn PDF document text
    • https://cdn.sqhk.co/nodomepe/FjfnU2N/86097069933.pdfIn PDF document text
    • https://site-1166659.mozfiles.com/files/1166659/49537088780.pdfIn PDF document text
    • http://velixone.66ghz.com/aero_performance_propellers.pdfIn PDF document text
    • https://site-1204352.mozfiles.com/files/1204352/58652799619.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/fFxwieR/marvin_gaye_most_popular_songs.pdfIn PDF document text
    • https://site-1168115.mozfiles.com/files/1168115/57584997484.pdfIn PDF document text
    • https://cdn.sqhk.co/wofosinewok/gfXhjgi/kesijuvesaditovikigagenof.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/gcq5Gpy/divaniwajojutanegoguv.pdfIn PDF document text
    • http://selozufuwadapuw.66ghz.com/52254236998.pdfIn PDF document text
    • https://cdn.sqhk.co/nemuvefik/ievgiEZ/word_collect_answers_level_1708.pdfIn PDF document text
    • https://cdn.sqhk.co/najafizox/TtsMhcO/lafomegujilurizawib.pdfIn PDF document text
    • https://site-1201795.mozfiles.com/files/1201795/86445581274.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wogakuw.rf.gd/charoen_pokphand_group_annual_report_2017.pdfIn PDF document text
    • http://zopopujeji.rf.gd/clitherall_lake_mn_fishing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/email_template_for_wedding_save_the_date.pdfIn PDF document text
    • http://wepinipinalojud.epizy.com/ap_literature_and_composition_practice_test.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/17101234057.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_off0000d220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD220 5132 bytes
SHA-256: e53ed3cf8c0dbe16035664a9681e3ce2a18b7ee891bde2851bff06eb41d70b52
font_01_sfnt_off0000e3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B3 10860 bytes
SHA-256: f6f05c07de735b32fe20aa08dd6a521749f20970cc40f304033b66b67a902c3e

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