Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4aad2f745d48946…

MALICIOUS

PDF

77.4 KB Created: 2021-03-09 13:03:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0126e7c52b63a2a34c5ea5144e94505f SHA-1: 36fa0fdb69f77782a62e99bffa2be9c142b602bf SHA-256: c4aad2f745d489466f8f6e514b8787c80c46ff1161824c52a9b065fb432deb7b
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing attempt. The primary URL, https://vilenefex.ru/award?keyword=vande+mataram+song+lyrics+in+telugu+pdf, is presented as a search result, likely to trick users into clicking. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://vilenefex.ru/award?keyword=vande+mataram+song+lyrics+in+telugu+pdf PDF link annotation
    • https://cdn.sqhk.co/tinulafi/ccic3WJ/58731357574.pdfIn PDF document text
    • https://cdn.sqhk.co/gosukutusu/ficELhc/eye_of_the_storm.pdfIn PDF document text
    • https://belogukuke.weebly.com/uploads/1/3/1/6/131637095/2eb6bef6442.pdfIn PDF document text
    • http://getdouche.xyz/heat_capacity_of_metals_lab_reportrm6u0.pdfIn PDF document text
    • http://fb-ig-copyright.com/96685341206iapjq.pdfIn PDF document text
    • http://chebsvet.ru/excel_guitar_tablature_templatevbv9z.pdfIn PDF document text
    • https://zujakeme.weebly.com/uploads/1/3/4/0/134041616/venenubab.pdfIn PDF document text
    • https://mafopobivo.weebly.com/uploads/1/3/4/3/134322173/8157015.pdfIn PDF document text
    • http://rocketdocs.us/chaine_dinformation_et_dnergie_viergek4geh.pdfIn PDF document text
    • http://vunixifatirami.22web.org/where_to_buy_speed_queen.pdfIn PDF document text
    • http://smirnoff-optic.com/what_is_the_central_idea_of_this_paragraph_brainlyqij56.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/hamilton_beach_breakfast_sandwich_maker_with_timer.pdfIn PDF document text
    • http://mitefarosut.rf.gd/sisewudatonozodiz.pdfIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_8f342ac8c0784917891878b697c895dc.pdf?index=trueIn PDF document text
    • https://de2ee6d5-caaa-4265-b15c-40100ab77d99.filesusr.com/ugd/d43733_257e36fc25684469a0db2efe43f5e466.pdf?index=trueIn PDF document text
    • http://pepebejawu.epizy.com/descargar_busuu_premium_apk_gratis.pdfIn PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_0d8713e2e4a54555b747ed7b38c4ca39.pdf?index=trueIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_6bf865684726487199ee1daaaddd2c63.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/capture_screen_android_stack_overflow.pdfIn PDF document text
    • http://fasewevabudumu.epizy.com/jowonapimibizawuvab.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/sql_server_2012_developer_edition_iso.pdfIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_4e597a1cecc94f0687fc4850b5b359b1.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_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 5540 bytes
SHA-256: 8389f5facdc05e2e51643f53271427ac087658df092a136e5166d40a7aca9f46
font_01_sfnt_off000103fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FA 10572 bytes
SHA-256: 987e325850ad1e6f3d2894334d0554df912e4cb2ab648c3d5887bc4d53ef4c61