Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef02b72b1610e352…

MALICIOUS

PDF

73.0 KB Created: 2021-03-23 21:47:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 9f7dbb4c14b4d171d8df89bd1a23698a SHA-1: 5fc6c841010bf27497aa5a0fe41f3ebc6eb4ff11 SHA-256: ef02b72b1610e352a03094f4883830f1734f9668fcdc7f0e3139c0e454d9ade1
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=osceola+tax+collector+bvl PDF link annotation
    • http://biomanix.best/sony_str_dh750_review92d14.pdfIn PDF document text
    • https://cdn.sqhk.co/wenegifuteg/idhh9on/17188819910.pdfIn PDF document text
    • https://cdn.sqhk.co/mopijiluxu/jFw6AI3/rowexuguvegoka.pdfIn PDF document text
    • http://sodalabs.pro/how_to_put_a_plastic_collar_on_a_dogzof3z.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/98958800181.pdfIn PDF document text
    • http://flylovel.com/xam_idea_accountancy_class_12_solutionsfw6z1.pdfIn PDF document text
    • http://libuwapuvewipev.mywebcommunity.org/the_house_on_mango_street_esperanza_last_name.pdfIn PDF document text
    • http://money-team.site/36513994968gntae.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/cbls6Yf/73336286924.pdfIn PDF document text
    • http://lojasamericanasbr.com/8351981586vx5cj.pdfIn PDF document text
    • http://voicebftyi.com/athens_tech_nursing_intent_formglzss.pdfIn PDF document text
    • http://help-copyrightviolationhelpcenter.com/how_many_lines_does_banquo_have_in_macbeth1qc59.pdfIn PDF document text
    • http://natlab.ru/bowularizuseib5ro.pdfIn PDF document text
    • http://appeal-ig.com/maus_google_drive_booksq59ch.pdfIn PDF document text
    • http://kieverts.xyz/why_doesnt_my_sky_q_remote_volume_worka96hn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ada19f3-0637-4007-8e6d-e8fd4e4340b3/2388365109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac306f23-5ff8-4238-8484-cb149e442e6e/unified_chart_of_accounts_for_nonprofit_organizations_quickbooks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b93f286-6a4d-4578-8fa0-ef762737e4f7/hp_laserjet_p3015_driver_for_windows_7_64_bit_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ca7c559-2fa3-4940-903c-7b5566018d59/9665777910.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3ca5501-4b06-42f6-98d9-6ea791a76161/peavey_vypyr_30_manual.pdfIn PDF document text
    • http://sajoveguduv.onlinewebshop.net/income_tax_amendments_for_fy_2020_19.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_off0000e293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE293 5088 bytes
SHA-256: 45b77c1499a66b437aa8d23c63cddb317067dcfccfa1da67535bad747dfc6089
font_01_sfnt_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 10160 bytes
SHA-256: d01b6953d642b951fdc6b399bf1b9fd3649fef905e7be267ed65a34838f4b1e8

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