Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a9db2000b89ec40…

MALICIOUS

PDF

76.4 KB Created: 2021-03-31 19:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7b87aa1b0e1026f377867377f666bda SHA-1: 77de4d998a76d191aa28eeb50c433a610ccc82a3 SHA-256: 5a9db2000b89ec40f856230e5c17f6c74d1c44d3161c8a942ce240590c64b3fe
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to potentially malicious domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting an attempt to manipulate search engine results or distribute malware. The ClamAV detection and ML classifier also strongly indicate malicious intent, likely related to phishing or malware delivery via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/wix?keyword=cell+energy+cycle+gizmo+quiz+answers
    • https://fosegeluka.weebly.com/uploads/1/3/4/7/134717840/646c034001.pdf
    • https://cdn.sqhk.co/vajirasavuz/fibhhgg/21716908041.pdf
    • https://cdn.sqhk.co/novimabe/jhiiPKx/nick_jonas_jealous_song_about_olivia.pdf
    • https://fupevigojajoma.weebly.com/uploads/1/3/0/7/130738700/pikare.pdf
    • https://fekugutupufug.weebly.com/uploads/1/3/4/8/134876907/6ef371e4f04b9.pdf
    • https://dogaralezuj.weebly.com/uploads/1/3/1/6/131637140/sizup_muwipi_mapuximijunalob_makufuxe.pdf
    • https://teraludejos.weebly.com/uploads/1/3/5/3/135304334/xizogemara_bevabola_ganuradugolej_gumepelo.pdf
    • https://cdn.sqhk.co/luwivimexu/pu7gc13/carolina_skiff_boat_plans.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ximupuv/10705839174.pdf
    • https://uploads.strikinglycdn.com/files/dda80baa-d572-4ed0-b329-3ebeabe068c7/69010037956.pdf
    • https://uploads.strikinglycdn.com/files/3ec73770-1443-4dae-9855-7da3c81064c6/percy_jackson_and_the_olympians_the_battle_of_the_labyrinth_chapter_1_summary.pdf
    • https://uploads.strikinglycdn.com/files/1db6fb82-33fb-44ab-938f-b6d27237c27d/international_journal_of_pharma_research_and_health_sciences_indexing.pdf
    • https://s3.amazonaws.com/tosego/7412669229.pdf
    • https://s3.amazonaws.com/xakajoziwibi/how_to_use_alpha_vantage_api_in_excel.pdf
    • https://s3.amazonaws.com/panokojol/50993885544.pdf
    • https://uploads.strikinglycdn.com/files/3ae070b1-ebeb-4956-afd3-d3c951a273e6/foucault_what_is_an_author_citation.pdf
    • https://s3.amazonaws.com/wemupajese/faliluzu.pdf
    • https://uploads.strikinglycdn.com/files/ea19cfae-7c2e-47c1-b328-85fe2942a16d/primos_proof_cam_01_-_gen_2.pdf
    • https://uploads.strikinglycdn.com/files/13f129b1-cee5-4eea-86a2-f7ebaff06193/how_to_turn_on_a_mini_ipod.pdf
    • https://s3.amazonaws.com/degisapemifa/nakuwizowejavivojal.pdf
    • https://s3.amazonaws.com/julaxel/84329328066.pdf
    • https://uploads.strikinglycdn.com/files/87a68266-1f9b-4bd0-90cd-3e469beeb05b/87296931172.pdf
    • https://s3.amazonaws.com/gixirojozogufux/logo_vector_free_png.pdf
    • https://s3.amazonaws.com/fekaduvopigab/internet_manager_chrome_extension_file.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_off0000ecf6.bin
915e016ffbb5f75178601e0089e14bc7b1a7211c7d9792ad3428db2157da2b75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECF6 5396 bytes
font_01_sfnt_off0000ff52.bin
d5515d333c19c71ec9832bcecbb68c0245eb3b665a0f5ac58d323fb43c657cc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF52 10892 bytes

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