Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53178d06e9018c6…

MALICIOUS

PDF

70.8 KB Created: 2021-03-22 16:26:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 76a3daf0245727b8d6002cb61f8ccf1f SHA-1: 14cb3b8d18598f981c01886bd234c8612ef1e0c8 SHA-256: e53178d06e9018c6d0b19aee73413c30c269835eb6002e84a8822054e0514db8
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ponafet.ru/strik?utm_term=polaris+sportsman+400+ho+parts+manual PDF link annotation
    • https://cdn.sqhk.co/kimejijomaki/gdjfgge/lelaxup.pdfIn PDF document text
    • http://dronextactical.xyz/how_do_i_reset_my_maytag_washernrzgz.pdfIn PDF document text
    • https://cdn.sqhk.co/lebudawojafi/ifzhigc/dji_spark_drone_remote_controller.pdfIn PDF document text
    • http://tixshopclub.fun/do_dachshunds_have_any_health_problemstrxv8.pdfIn PDF document text
    • http://all-casino.xyz/positive_affirmations_worksheete8m4s.pdfIn PDF document text
    • https://cdn.sqhk.co/zigimovovu/nbgjgdl/hangman_movie_2015_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/majukedow/Fjigdhb/capture_screenshot_android_code.pdfIn PDF document text
    • https://cdn.sqhk.co/buwowunuras/jesifja/3d_earth_globe_free_download.pdfIn PDF document text
    • http://pihodze.com/what_is_palilaliaj46ld.pdfIn PDF document text
    • http://prosale.company/las_vocales_para_imprimirno0nh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_112cfd5bff2d457d9b083475eb79407f.pdf?index=trueIn PDF document text
    • https://665985ba-8e9f-4173-b993-17a3090d61d7.filesusr.com/ugd/08421c_c75d7496eab4460eaf980c920b652d9d.pdf?index=trueIn PDF document text
    • https://fdf0fb27-5181-4190-8e1a-80fb86d87eb1.filesusr.com/ugd/2410c9_3adad849bd6d4a92a5e8798243d06a92.pdf?index=trueIn PDF document text
    • https://368af19b-b9be-4417-8ea7-dfc4611f9fec.filesusr.com/ugd/abd4c0_243a36ccbfe04070a9f025c4daf56560.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/prague_airport_transfers_get_your_guide.pdfIn PDF document text
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_c21c762f9bcf452bbbe0eb47f42fb94f.pdf?index=trueIn PDF document text
    • https://e1318bff-d970-45e2-bcea-45481503a18b.filesusr.com/ugd/75a96d_3d15134436944e90bf5c1aa948b1d6bb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xalasawu/wow_mistweaver_monk_guide_bfa.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/51260415030.pdfIn PDF document text
    • https://314a97e4-cc7b-499c-a999-42b15fb65c39.filesusr.com/ugd/fa4a73_9fe20086a4a14806863df5385d5ea64f.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD716 5288 bytes
SHA-256: e25d2fdb7839b6546828a5fd243681bccf4b36d240f6cf41de60053a1fd12a94
font_01_sfnt_off0000e8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E7 10916 bytes
SHA-256: 16838fe68faa32f5121ede1d56155cb4feff4dd51bd0d558a6a5575d840ff37b