Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff8ebad83de1c17b…

MALICIOUS

PDF

71.6 KB Created: 2021-04-19 02:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a4f6e0939b3386b8d637568de209728 SHA-1: b4ffeafc86e7f0572c7c25203cf499810f482452 SHA-256: ff8ebad83de1c17b03ece21c0f43cf70e3bc45f42e521e38063ac0cf3b23c254
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious sites, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crophysi.ru/strik?utm_term=how+to+connect+wires+to+honeywell+thermostat
    • http://alex-chekalev.com/rheem_electric_water_heater_error_codesqr71f.pdf
    • https://wisamifogafize.weebly.com/uploads/1/3/4/5/134598642/a4164545faf.pdf
    • https://cdn.sqhk.co/puzadowoke/dDhhgco/trafalgar_senate_polls_north_carolina.pdf
    • https://makigomeludawuk.weebly.com/uploads/1/3/4/7/134748455/funuwaxi_najari_wujewu_rotokariba.pdf
    • https://cdn-cms.f-static.net/uploads/4465938/normal_5fd9e32360d0c.pdf
    • https://cdn-cms.f-static.net/uploads/4383450/normal_60228b2ce32a9.pdf
    • https://cdn-cms.f-static.net/uploads/4463554/normal_604e8889d0f30.pdf
    • http://parrrtner.xyz/gijagefusevuxotubsj3m4.pdf
    • http://blacktea.space/semudubokuzaminojigejv09sn.pdf
    • https://cdn.sqhk.co/vumuwilaj/ewjhHls/19602513462.pdf
    • https://cdn.sqhk.co/sukonazukuv/gfXSVhj/88036725136.pdf
    • https://cdn.sqhk.co/melipetoluf/fiehiQ5/juegos_de_bounzy_2_y8.pdf
    • http://italywow.pro/blattformate_technische_zeichnungenhspy6.pdf
    • https://legoxadev.weebly.com/uploads/1/3/2/3/132302888/mewemilivitegumi.pdf
    • https://cdn-cms.f-static.net/uploads/4393488/normal_5fd795c9e6dc4.pdf
    • https://cdn.sqhk.co/bijukipuj/R9hihj7/hubspot_email_sales_templates.pdf
    • https://cdn-cms.f-static.net/uploads/4365607/normal_6039b48ec8ce9.pdf
    • http://helplnstagramcontact6088758.com/pioneer_vsx-523-k_manuallx18p.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1eba3b37-3dce-45e8-aa15-e51a58efc0fe.filesusr.com/ugd/89e37c_a22db83a5f0845a2b8f3a5a17d59b474.pdf?index=true
    • https://s3.amazonaws.com/posufij/gonepotozuzago.pdf
    • https://s3.amazonaws.com/fosagoba/wokosoxobosegetefo.pdf
    • https://83c30a2d-d83c-4020-88f4-fdb7bed8c9e2.filesusr.com/ugd/e59e18_f5aa02852900476ca81fcd9098df1cdc.pdf?index=true
    • https://s3.amazonaws.com/dafumuxitupav/descargar_adobe_spark_video_apk.pdf
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_cf6fc6b2f74942b79d83405deb82c795.pdf?index=true
    • https://ae9cd3fc-a2ed-4114-aa96-dd53a7e96ab4.filesusr.com/ugd/22cbe6_52b337d3bfae4036b770c45ea2365e8e.pdf?index=true
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_0fafac7d2bcb4bf5aa0c5186d76aab3f.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_off0000daf3.bin
811afc22edee729484efcd5f233e5d719ad403967dd17844e51a6adcfb8ffbc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF3 5192 bytes
font_01_sfnt_off0000ec82.bin
479751ce1e0d5e3fa4acf96348fd4078c6ca9682dc5249394bde40c7e03fa430		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC82 10084 bytes

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