Malicious PDF — malware analysis report

Static analysis result for SHA-256 64652164edbde867…

MALICIOUS

PDF

70.5 KB Created: 2021-03-31 04:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 974de12e59b71e3c5ac4b67a4bcd667f SHA-1: 5fc438670bb9e568146295248fb065bc583c4050 SHA-256: 64652164edbde867c59071325ee004e37903ba29a08e4484fae8e597e8226a09
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a mass of external links, suggesting it functions as a link farm to distribute phishing or malware. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this attack pattern. No scripts were extracted, but the primary function appears to be directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/123?utm_term=kelington+group+berhad+annual+report PDF link annotation
    • https://cdn.sqhk.co/ruvazilu/78jbkjc/fenan.pdfIn PDF document text
    • https://cdn.sqhk.co/bujavenizake/7haMhel/power_rangers_legacy_wars_hack_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/eQhh6hj/f1_2016_calendar.pdfIn PDF document text
    • https://cdn.sqhk.co/ramawuvade/iihgGjf/xekonaw.pdfIn PDF document text
    • http://demumamudu.22web.org/bsac_endocarditis.pdfIn PDF document text
    • https://cdn.sqhk.co/xogiwusumo/ihX4hfA/6049407231.pdfIn PDF document text
    • http://fapedivojo.22web.org/essential_sales_skills.pdfIn PDF document text
    • https://cdn.sqhk.co/solalokazili/gf9Yifr/star_traders_frontiers_review_ign.pdfIn PDF document text
    • https://cdn.sqhk.co/rolidofajug/eq2Xidp/99641741117.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4c8e72c6-e2e3-4108-adc6-102de481692d.filesusr.com/ugd/f4b4ca_d93917131e6f4ad6b234e67d4fe67b6c.pdf?index=trueIn PDF document text
    • https://569961a5-e6b5-462d-8b38-7193d5e7b20b.filesusr.com/ugd/a37a2e_2068a7f803eb483cb7f0194e09c33200.pdf?index=trueIn PDF document text
    • http://kiwejip.epizy.com/mainstays_essential_oil_fan_diffuser_instructions.pdfIn PDF document text
    • https://041aa876-b65b-432c-96c0-58c8b295a4e4.filesusr.com/ugd/90d19e_f78166e7b82540b6ab83193cc34090c6.pdf?index=trueIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_0ae889dfd2c5496692aba4afff88e442.pdf?index=trueIn PDF document text
    • https://63209029-b609-4f89-80e5-af59b408cdb4.filesusr.com/ugd/0713e6_b6a64d39a1f34b8c9d606a5a3b6efe2c.pdf?index=trueIn PDF document text
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_3180c6f79f3b49519a95fe0824655da6.pdf?index=trueIn PDF document text
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_e6daa3e002414e6289e7bc2de0c1dfa1.pdf?index=trueIn PDF document text
    • https://0e01c86c-6ad9-43de-bc04-b8819f410213.filesusr.com/ugd/73c254_462857eec96249e7a5959d4e07e8424f.pdf?index=trueIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_f4c6b3fc58e74d6395e403ea9a560826.pdf?index=trueIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_32da901402794cfba0629a2b8ef525dc.pdf?index=trueIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_cabba9e86bbf4d8d839378d4951418dc.pdf?index=trueIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_aba1ce2762c04dd09af18ac8539eea98.pdf?index=trueIn PDF document text
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_ce9fdb3fe93c455880002de54a01c577.pdf?index=trueIn 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_off0000d577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD577 5152 bytes
SHA-256: b603f94ea098d2d51369f200626345ed27c17f1a6920a69c2916f68876d8ecde
font_01_sfnt_off0000e6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F3 11076 bytes
SHA-256: df2392ddc64f2622b09938ae2e4d00e611b0b090cc7a99f912054220596a56b2

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