Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23a67a8f925ac51…

MALICIOUS

PDF

70.9 KB Created: 2021-03-09 23:59:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 63d7a61b566572726d4fac23cfe16090 SHA-1: e4df4fe80799c65450e303aa7c0ec8ced3f0abfe SHA-256: c23a67a8f925ac51acf4b63301f9dd6263324ec352a9052bcf85c56c2c1b1ae6
126 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. The document contains numerous external URIs, including one pointing to 'xezojetit.ru', suggesting it is designed to redirect users to potentially harmful websites. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support that this document is part of a phishing or malware distribution scheme.

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://xezojetit.ru/award?keyword=spelling+rules+book+pdf PDF link annotation
    • http://sunugukumota.getenjoyment.net/important_banking_and_financial_terms.pdfIn PDF document text
    • https://xaxozugine.weebly.com/uploads/1/3/2/3/132303195/sifevubisufepi.pdfIn PDF document text
    • https://cdn.sqhk.co/todusukiraxi/gdhfCgj/hades_star_how_many_battleships.pdfIn PDF document text
    • http://sufofure.mywebcommunity.org/adding_and_subtracting_decimals_notes.pdfIn PDF document text
    • https://tadeliganunuzax.weebly.com/uploads/1/3/0/9/130969808/xetaworu-tozubobififux-zamujaxi.pdfIn PDF document text
    • https://cdn.sqhk.co/pugirunosamo/hhQjjif/marshmello_alone_remix_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/turaxulefa/HAiabgh/vikiwudofaxosomejujodexi.pdfIn PDF document text
    • https://cdn.sqhk.co/gizukakom/UCgdhh2/55933275714.pdfIn PDF document text
    • https://cdn.sqhk.co/zawatilirip/hhFkghD/hidden_objects_free_no_download_games.pdfIn PDF document text
    • http://vopugixeroramox.medianewsonline.com/php_html_file_to_string.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_487c19b99a1845aca5b0c57543cb5651.pdf?index=trueIn PDF document text
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_38d00ec74e014aa294d0e5dc53eefb12.pdf?index=trueIn PDF document text
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_42f4c12eef8245599116f141cee8e28e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e5aea8b-8914-49c0-994d-baeb54a51cee/wendys_hamburgers_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caf241e3-f95d-4d1c-96d7-5f8b72559f0d/39177472038.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/hsc_result_2018_bd_marksheet_with_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee14cfd2-2e00-4de8-992f-5e03b6d34f62/86467139377.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/diet_for_anemia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6abd8b5c-103d-453a-96c8-0ec3e696a318/banekesuxo.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/download_primavera_p6.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/26935670497.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_off0000d6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F7 5304 bytes
SHA-256: b5a439f4c97f9d43fa0cbeef39ffd4a43a6558d135a0a23d1091411d6f3f9869
font_01_sfnt_off0000e90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90F 10796 bytes
SHA-256: bf4673a57dd94e2c33a49f384fdc29fb3d857183b406eaec4f4ce29e20f099f2

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