Malicious PDF — malware analysis report

Static analysis result for SHA-256 924efab54da13cde…

MALICIOUS

PDF

70.0 KB Created: 2021-03-26 12:58:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 7ddec53cbfe162b173131b9d0df5226f SHA-1: 3d505b638d35510914f2c69c7b6725e529e45f28 SHA-256: 924efab54da13cdec27f029c5c8d0f3b4eb03c7f5372854cb8766ed6ce2c4af2
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The primary malicious URL identified is https://soxebez.ru/award?keyword=dueling+banjos+ukulele+tab+pdf, which is presented as a search result.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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.
  • 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://soxebez.ru/award?keyword=dueling+banjos+ukulele+tab+pdf PDF link annotation
    • https://cdn.sqhk.co/nixenexax/Tjcgfhg/encyclopedia_britannica_kids.pdfIn PDF document text
    • http://tupuwuwegidava.22web.org/sql_database_viewer.pdfIn PDF document text
    • http://xokubenafap.66ghz.com/root_browser_for_android_2._3.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/gijekeu/life_after_death.pdfIn PDF document text
    • https://cdn.sqhk.co/kitolitik/5fhiibZ/chocolate_frosting_cake_decorating_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/doxelatofon/Eid5gfC/dirov.pdfIn PDF document text
    • http://megivisu.22web.org/48178471012.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fab88ded-2f12-46c9-b6ec-f290036286cc.filesusr.com/ugd/cce69c_90694142bf9f4c0fa12fc0da897c38de.pdf?index=trueIn PDF document text
    • http://fasasipapuzu.rf.gd/84614321376.pdfIn PDF document text
    • http://fugusun.epizy.com/geriatric_assessment_procedure.pdfIn PDF document text
    • https://7605d98d-8b17-4a41-9383-f5c8d5af9bcc.filesusr.com/ugd/2bed4c_3279043ef53140fb971e7ffd1b386fb6.pdf?index=trueIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_d61338af545248849b86f3beba20cf6a.pdf?index=trueIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_37ce92423e5c4827a8faa819c8434a21.pdf?index=trueIn PDF document text
    • https://30de3caf-c510-4ce9-8691-b8280dc60d9b.filesusr.com/ugd/4980ee_f6c59f94a64e46cda15f3e14b11bdc38.pdf?index=trueIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_de583e27faa94ffb9d80288787c184ac.pdf?index=trueIn PDF document text
    • http://bekazutebazifob.rf.gd/how_do_i_connect_my_wd_tv_live_to_my_computer.pdfIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_7d391f365448490cbcf0a5ce771b7115.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/626d2cec-86c2-4953-9516-96979a09313e/muxanolukegili.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69cc10f8-b4b7-493f-98fc-a7492069074a/fegitukenedorija.pdfIn PDF document text
    • http://fosisidevafepet.epizy.com/nys_pistol_permit_application.pdfIn PDF document text
    • http://neluwomarar.epizy.com/cane_s_chicken_menu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c85fe148-9862-4f99-819c-32dc7fbe2f32/beats_by_dre_3_wireless_white.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3217b354-17b5-4809-8488-416121f48abe/can_physical_therapy_help_with_scoliosis.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_off0000d52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52C 5392 bytes
SHA-256: 045ccf4279204713884e5aeb9cc6184ec04550410a781d1320fc2def2bd1a319
font_01_sfnt_off0000e7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A2 10224 bytes
SHA-256: 4d404173960270a122b3a2820661d1d74b81a2a532570f876b55a87d9ec0d47c