Malicious PDF — malware analysis report

Static analysis result for SHA-256 635e4491baff4a01…

MALICIOUS

PDF

77.4 KB Created: 2021-05-14 05:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 265fa5eac7b97799bf2db23f1605f951 SHA-1: a36d5491bbebe2d0480d172ebe796ed9a60f8416 SHA-256: 635e4491baff4a0135070eaba786bed4503e5fc81f90bf33ba0dd950e058d037
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The 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 of which point to potentially malicious domains, suggesting a link farm or phishing campaign. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate that the document is designed to redirect users to other sites, likely for further exploitation or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=mythology+edith+hamilton+table+of+contents
    • https://gozopurejogutix.weebly.com/uploads/1/3/4/5/134578339/3034739.pdf
    • http://kewokuxumuzig.medianewsonline.com/srimad_bhagavad_gita_english_free_download.pdf
    • https://vexofemefenulo.weebly.com/uploads/1/3/4/5/134594555/6522696.pdf
    • https://mexobuvuxe.weebly.com/uploads/1/3/4/3/134369937/38ed258c8.pdf
    • http://nibakelenixezas.getenjoyment.net/welcome_address_association_inaugural_function.pdf
    • http://gasurorir.sportsontheweb.net/zovos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_81015652a4844867bb45fec502b67714.pdf?index=true
    • https://uploads.strikinglycdn.com/files/13cf6d31-8fae-4f21-94d4-29eb74794a23/85786121134.pdf
    • https://uploads.strikinglycdn.com/files/81f25cfb-a6a7-46cb-84b7-fb1f79d8317d/22031309423.pdf
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_eb7c1e68fbc445d4945583595adbbb05.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1617bb0f-47d0-4289-884f-828db988a52e/mechanical_engineering_salary_michigan.pdf
    • http://sajulugebimisu.myartsonline.com/how_to_replace_belt_and_rollers_on_maytag_dryer.pdf
    • https://df867d32-629d-4b48-af14-2fc5df20f827.filesusr.com/ugd/287761_4d477ae11d384d9f81cc48fff0d04495.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e7893818-c5a5-4057-adf0-496c55948750/how_to_connect_ps3_bd_remote_to_ps4.pdf
    • https://uploads.strikinglycdn.com/files/e851da02-97e7-429e-b178-8a29d675abdf/in_christ_alone_sda_hymnal.pdf
    • https://uploads.strikinglycdn.com/files/765d504f-d89e-4aaf-ba02-a33ec106dfa7/puduwifuvovosefukesago.pdf
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_91573b27291a4602977d66390d7100e8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cc126d0c-9aea-4b25-91bc-bd38de0f8841/black_decker_rice_cooker_plus_instructions.pdf
    • http://buzumigasox.myartsonline.com/cysteine_proteases.pdf
    • https://uploads.strikinglycdn.com/files/638ffbad-3f46-4e1d-b739-ee9465c12aa0/what_are_the_duties_of_a_general_manager_of_a_restaurant.pdf
    • https://uploads.strikinglycdn.com/files/27ed1cfa-2e44-4af7-b12f-5c5be2aff28d/books_like_secret_life_of_walter_mitty.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0e4.bin
215f4fad116e6a5b461a479268bd9a980d1026e4eab655052db0191ac4251cd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E4 5584 bytes
font_01_sfnt_off000103d7.bin
4d5d25817eef795cd70516b658a7fea67042272568a79a08fd3db54e0b21d231		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103D7 10616 bytes

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