Malicious PDF — malware analysis report

Static analysis result for SHA-256 be2216d8270a55b0…

MALICIOUS

PDF

97.1 KB Created: 2021-05-25 09:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8faa4a18e91099ef75f1766d56163510 SHA-1: b5ad4f1f5325de83113f5a1c44600e35de779932 SHA-256: be2216d8270a55b08e7f6ff7bc8041db006fb56fb4fe7aa2f0becedc0ced4cde
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified as a link farm, which is a common tactic for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure itself facilitates the redirection to potentially malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nipisod.ru/strik?utm_term=gemischte+br%25C3%25BCche+multiplizieren+aufgaben+pdf
    • https://nogonosexenepe.weebly.com/uploads/1/3/4/6/134674491/c21680ac54194.pdf
    • https://cdn-cms.f-static.net/uploads/4366004/normal_6009c96fd02f5.pdf
    • https://xoririsi.weebly.com/uploads/1/3/4/8/134848275/5375618.pdf
    • https://cdn-cms.f-static.net/uploads/4379726/normal_6040513a0dbe4.pdf
    • https://malodarugamizo.weebly.com/uploads/1/3/4/8/134853004/zalefilu-koredo-kofefukog.pdf
    • https://duragafadave.weebly.com/uploads/1/3/1/4/131438389/5404004.pdf
    • https://cdn-cms.f-static.net/uploads/4404730/normal_5fd7e344103ae.pdf
    • https://virixodebusetij.weebly.com/uploads/1/3/1/3/131383575/356227.pdf
    • https://static.s123-cdn-static.com/uploads/4365662/normal_5ff0e5c63c6c4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8a0e4ff1-599a-49ba-96f2-63a9a4f9aa29/murray_12_hp_38_riding_mower_belt_size.pdf
    • https://uploads.strikinglycdn.com/files/a66928d2-d586-4ae3-83c6-aa997344765f/teorema_de_bayes_explicacion_y_ejemplos.pdf
    • https://uploads.strikinglycdn.com/files/1c0e2096-0210-46cb-b972-ac11e1e0def3/yaesu_ftdx_1200_specs.pdf
    • https://uploads.strikinglycdn.com/files/8a4a6853-0fc9-477d-9423-b8d6fa4d24a6/monster_inc_mike_wazowski_voice.pdf
    • https://s3.amazonaws.com/nonipesikiri/zifak.pdf
    • https://s3.amazonaws.com/zuwimadaneb/jason_and_the_argonauts_book_2.pdf
    • https://s3.amazonaws.com/sefiwegegagu/70311205980.pdf
    • https://uploads.strikinglycdn.com/files/7c9bce3d-609d-46bf-91c7-b3a40c60c503/luom_g10_gaming_mouse_software_download.pdf
    • https://uploads.strikinglycdn.com/files/e0524dd3-9ad4-41b6-8ccf-88d99690c898/total_gym_xls_workout_routine.pdf
    • https://s3.amazonaws.com/zagapaxa/chogada_video_song_1080p.pdf
    • https://uploads.strikinglycdn.com/files/154fd578-09bf-4f7a-8a1e-ee4e3a56b37f/42965271268.pdf
    • https://uploads.strikinglycdn.com/files/b3682c7a-72a9-4cba-8090-0f86335a0838/32093470633.pdf
    • https://uploads.strikinglycdn.com/files/0f757754-b2f1-4a5e-8e66-7a29c4c8c845/download_livro_memrias_pstumas_de_brs_cubas.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124e0.bin
b67334a1c468a06dc51d2fd5968bc17a853260ccc4e7b00f37904beaad437342		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124E0 5912 bytes
font_01_sfnt_off000138aa.bin
f9f664fac0e46a7e451ed9bf23b61c86fe1d035b557e4a63b6b6ba243add26ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138AA 11564 bytes
font_02_sfnt_off00015ef0.bin
014496cdc810fd36dc51373d3c14121957e6ae8be2c217d958fed9d6b2e26cb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15EF0 16176 bytes

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