Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5035e17d34c085d…

MALICIOUS

PDF

72.6 KB Created: 2021-06-11 06:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 294feb77d1bf1c25c0e04c277ca0578e SHA-1: fe7d91337987de4be3ac701a9be116dcfb460c0a SHA-256: c5035e17d34c085d976caa4f89781627b0374d5dc43e5dd303b03a24c596bc4b
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. It uses brand-impersonation credential phishing. 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 0.9993

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
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://majosipodolonax.weebly.com/uploads/1/3/0/8/130814003/4bd64b582bde0.pdf.
  • 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://chcial.ru/pbw?utm_term=declarative+sentence+and+interrogative+sentence PDF link annotation
    • https://majosipodolonax.weebly.com/uploads/1/3/0/8/130814003/4bd64b582bde0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443821/normal_6068d5e420731.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471688/normal_606a9b4f59172.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420589/normal_6038bc2d016d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486963/normal_6004946c0fffb.pdfIn PDF document text
    • https://kazenatujexisof.weebly.com/uploads/1/3/1/6/131637291/baa904.pdfIn PDF document text
    • https://bixolajulepu.weebly.com/uploads/1/3/4/7/134746591/jilanatud_suxipokaledogov.pdfIn PDF document text
    • https://figuxola.weebly.com/uploads/1/3/7/5/137517110/nujuvitoroki_vofubisa_fepureki_luwejarorolagop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488101/normal_5fc8c22dbfb2d.pdfIn PDF document text
    • https://vobulesije.weebly.com/uploads/1/3/1/8/131857334/651952.pdfIn PDF document text
    • https://xatawozenovug.weebly.com/uploads/1/3/4/8/134886035/dakazusifukig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469104/normal_5fc8e0b5457ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447626/normal_60521306b0161.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416150/normal_5fc87270db6e2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sikovifif.pbworks.com/f/dixopisu.pdfIn PDF document text
    • http://jilawuxifi.pbworks.com/f/fundamentals_of_electric_circuits_6th_edition_solutions_chapter_10.pdfIn PDF document text
    • http://jesababa.pbworks.com/w/file/fetch/144425646/name_that_circle_part_answer_key_gina_wilson_2015.pdfIn PDF document text
    • http://damopijos.pbworks.com/w/file/fetch/144526758/halo_2_unblocked.pdfIn PDF document text
    • http://vaturefegape.pbworks.com/f/nitrado_ark_server_cross_platform.pdfIn PDF document text
    • http://sodopateduke.pbworks.com/w/file/fetch/144625785/hotstar_channel_divya_drishti_serial.pdfIn PDF document text
    • http://podimil.pbworks.com/f/adding_fractions_worksheets_with_answers.pdfIn PDF document text
    • http://lekuzax.pbworks.com/f/11912868328.pdfIn PDF document text
    • http://filijego.pbworks.com/f/17903055315.pdfIn 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_off0000dd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4A 5168 bytes
SHA-256: 3dfc190ce9c71ad791e0ac32a4f88673684e2869fb3e186d083882fb6a4915d1
font_01_sfnt_off0000eef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF8 11416 bytes
SHA-256: f3785e694d47abcb72e192620681c8fa164360a0a2c7bdd6d9dd180ebd2a51bd