Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c7f3d996eb79767…

MALICIOUS

PDF

76.8 KB Created: 2021-04-05 17:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c160135c30617b2d1b03a0b75f0b0b14 SHA-1: 717e24d75f9c724b11575092254ab62596f6d637 SHA-256: 2c7f3d996eb797671040db7fbc3e0b7d21c3ca07f141aa8e76d1a352893a728d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/strik?utm_term=what+happens+to+interest+rates+when+the+stock+market+drops PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463287/normal_601488dcab3b8.pdfIn PDF document text
    • http://get3creditscores.info/what_to_do_if_beats_wont_chargedkrnn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470226/normal_6036f2d6c35be.pdfIn PDF document text
    • http://lnstagramcopyrigtservice.com/bol_chudiya_bol_kangnasz3s5.pdfIn PDF document text
    • http://ludshop.xyz/is_physics_2_harder_than_physics_14v253.pdfIn PDF document text
    • http://antinomi.design/11464925487x8oc5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483335/normal_5fcfb042d9ed4.pdfIn PDF document text
    • http://on-arenas.com/kung_fury_movie_castmcrpe.pdfIn PDF document text
    • http://medway24.com/sas_9.4_ods_excel_examplemiyfe.pdfIn PDF document text
    • http://choosemadam.site/rewiruvedixutujosateparlm1q9.pdfIn PDF document text
    • http://giocodigital.fun/taptap_app_download_apkpurerk0ko.pdfIn PDF document text
    • http://storeplus.pro/my_backbeat_fit_wont_turn_onxq4eb.pdfIn PDF document text
    • http://waystep.site/antigone_sophocleprzvx.pdfIn PDF document text
    • http://help-business-media.com/7168122442gj7ss.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388613/normal_6000c60c0d64e.pdfIn PDF document text
    • http://parkingtest.xyz/choices_mod_apk_android_republicl6nw2.pdfIn PDF document text
    • http://mirror-x.org/79283966073jx2m0.pdfIn PDF document text
    • http://shopsmmv.site/persona_4_golden_guide_booky9i18.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_924925cec0734aefb597e19f479a39e0.pdf?index=trueIn PDF document text
    • https://a804c8a8-fdf7-4fba-b19b-c23aecc29597.filesusr.com/ugd/a7074a_70aea634b6744b1082d7a4d6c52d5d5e.pdf?index=trueIn PDF document text
    • https://71da2aa5-51c3-4f2c-ab18-08bbbad20131.filesusr.com/ugd/d216cb_2f3eb1ee60e54fa9baddeac941687f2c.pdf?index=trueIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_8cfa0af0d9574648bf307095c4edc7c0.pdf?index=trueIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_e8603c7306b74e75a66972186521385a.pdf?index=trueIn PDF document text
    • https://fdb0147f-387d-4908-9c93-1ccdb5bf775f.filesusr.com/ugd/aea2e0_93018f4fbb54428387236967a0167dae.pdf?index=trueIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_c84cf1a32e1841cbac4cfc7ee3a31719.pdf?index=trueIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_0236c15a6c4e41d682f721e29893c887.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_off0000ec3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3D 5452 bytes
SHA-256: 58fb7e5a0af1436feb91f12ea38abcacd01e2df479d1e7d64d1580535343a729
font_01_sfnt_off0000feae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAE 11212 bytes
SHA-256: 30c54341dac744c55a87437a5c321f4b3f6e292a4b7d2a609a7a5f2234d93623