Malicious PDF — malware analysis report

Static analysis result for SHA-256 9440844717e92581…

MALICIOUS

PDF

82.6 KB Created: 2021-03-27 11:28:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 929417490c1c4aa7d0400aa6658da529 SHA-1: 76d3c8fe79338e4acf83466a9070aebb723376f1 SHA-256: 9440844717e9258134d583b44a0862d182c2b2d111345e886b309687ab8922a7
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. It contains numerous external links, with a significant number pointing to a link farm, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The embedded URLs and the PDF structure indicate a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/wix?keyword=categorical+syllogism+worksheet
    • http://ontrade.top/99743520467ka1eh.pdf
    • https://cdn.sqhk.co/feguzuvubut/gjhhff9/37777466436.pdf
    • http://muzhskoizhurnal.ru/how_to_apply_semi_permanent_hair_color_at_home7y8xy.pdf
    • https://cdn.sqhk.co/jabupexipa/Gheidhc/shooting_elite_3d_gun_shooter_mod_apk.pdf
    • http://shoes-storie.club/safety_standards_for_building_constructionw95kz.pdf
    • http://bred-enligne.com/guwazajariwewrvr7z.pdf
    • http://getdouche.xyz/advanced_calculus_problems_and_solutions1111m.pdf
    • https://cdn.sqhk.co/wefenosefob/gIVhejd/gajexava.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1b3e2d6a-0348-4772-9bb2-16e56a761455.filesusr.com/ugd/7bcf02_93f92dfff6e24341b13fd3743b652733.pdf?index=true
    • https://1261df91-4e32-40b2-8b8a-4050d3c54cbb.filesusr.com/ugd/df69c1_85ef058810ce4fef8bb9f91a26e75658.pdf?index=true
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_b02763b015fc46c2b3704801ef758446.pdf?index=true
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_9db03dd937394000b01b109fd6b43d0e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cdecb019-f507-4fe2-a3d8-0133e5b573e0/samsung_chromebook_xe303c12-a01us_price.pdf
    • https://uploads.strikinglycdn.com/files/204a64ed-3e25-4f31-86da-53962df182bd/79881472597.pdf
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_c72eff0a94e14a6b856d517629f6e292.pdf?index=true
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_cfcd1c5002ea4f2b9574192a6e4bc3d9.pdf?index=true
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_01f2a89fb9cb454d87efa662873d46f8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/58f26ee8-6732-4238-a9ff-6964637b2e7b/latest_john_grisham_books_in_order.pdf
    • https://d80f29e5-b60c-4034-b355-14c03cb49cca.filesusr.com/ugd/ff44ec_ba904becf6be4f8aa66019bd04bc2ac7.pdf?index=true
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_1aacc21796fe4139bf8e41ed62606b02.pdf?index=true
    • https://9fc80a0e-b25b-4135-afeb-9811a1ea6bf8.filesusr.com/ugd/91e123_55549d8a31b34953a8307b328984d0b5.pdf?index=true
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_16ffd095eb444d39813da04f97ccb8a5.pdf?index=true
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_e43b7469766749328dde7406178523c7.pdf?index=true
    • https://b46c4cda-4951-41c0-816f-bbf02eee4d9b.filesusr.com/ugd/4ff992_0209f8229dac4b81a0255f0a49a03b7f.pdf?index=true
    • https://ebcfae26-b4e4-4f1a-a5b2-c5bdbddc1bdf.filesusr.com/ugd/259f90_df0f87838a2b44588a678507528e6ba7.pdf?index=true
    • 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_off00010543.bin
8f179c595f0e7b093dc12f22014916cb7376897a8b8935e7eb6bbf538b05b077		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10543 5376 bytes
font_01_sfnt_off00011775.bin
8b0d23802580f1c60338fc39171430e44e1adba7976688d7966971d2cbc33c08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11775 10872 bytes

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