Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea7dd01a65b89166…

MALICIOUS

PDF

80.5 KB Created: 2021-03-18 18:19:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d79c4d6578571e8fdc078906ce109177 SHA-1: 230e12193f1bc4b9dbdb88f4bbef5565f79e6c94 SHA-256: ea7dd01a65b89166db4fb34266f472380cba45b4d23874a44450f1ff41db47b7
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://resalured.ru/strik?utm_term=meaning+of+redemption+song+lyrics', is particularly suspicious and likely leads to malicious content or phishing pages. The document body is heavily obfuscated and unreadable, but the presence of numerous external links points towards an attempt to redirect the user to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=meaning+of+redemption+song+lyrics PDF link annotation
    • http://peramen.22web.org/como_quitar_formato_de_fecha_en_celda_de_excel.pdfIn PDF document text
    • http://ideaita.fun/star_trek_original_cast_movies_ranked0p7nf.pdfIn PDF document text
    • https://barijimuje.weebly.com/uploads/1/3/1/4/131406344/ddcf60f06eb66e4.pdfIn PDF document text
    • http://xuwajofona.iblogger.org/medical_laboratory_report_writing.pdfIn PDF document text
    • http://dektesheff.xyz/muvoxudufatuzasejudagdy6gn.pdfIn PDF document text
    • https://tagalevef.weebly.com/uploads/1/3/0/8/130815582/23957ad249.pdfIn PDF document text
    • https://vidiwubiref.weebly.com/uploads/1/3/0/8/130874646/dilufo.pdfIn PDF document text
    • https://divebofa.weebly.com/uploads/1/3/4/6/134690115/2167422.pdfIn PDF document text
    • http://jasetukuxazep.22web.org/address_change_application_format.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f66efe27-8af8-4daa-b144-034540b0b2cb/88032836806.pdfIn PDF document text
    • http://zafovitunopejus.epizy.com/rust_sheet_metal_scraps.pdfIn PDF document text
    • https://8ee4d174-735f-4cd7-9396-c3a65dbcc337.filesusr.com/ugd/5ac313_49b9f8c44c7249e89427bf8c990a19a0.pdf?index=trueIn PDF document text
    • https://288dffde-0386-48bd-adba-b069b5f3b70f.filesusr.com/ugd/7e1b39_d6298d53e1304fc0a7fbd076b812ecb5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e4bd223-8f6f-4620-822a-2566ac065d2d/legevepeniwikasumowa.pdfIn PDF document text
    • http://surotatifezuxe.rf.gd/57334410079.pdfIn PDF document text
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_1e9ae5e8eced4c1b8ae0048d9f629a1b.pdf?index=trueIn PDF document text
    • http://nizapowedasa.rf.gd/33955684763.pdfIn PDF document text
    • http://sivakekixil.epizy.com/how_do_i_trade_options_on_thinkorswim.pdfIn PDF document text
    • http://tuxefovibipudun.epizy.com/adada_malada_tamil_song.pdfIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_e0e00a3d18e54e9998ccb7ea9453a2a4.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_off0000fada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADA 5580 bytes
SHA-256: f7c71cdf3a30ffe9e5150f58abbf732577470641aaf98f3a9a704dc113f105a4
font_01_sfnt_off00010dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDA 11364 bytes
SHA-256: 438d167c88015e6b709f98f3c3e96be3f2883f7cb2d90d95a3c4a232f0ce64ac