Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaea6d9c1191e4b4…

MALICIOUS

PDF

80.1 KB Created: 2021-03-03 15:41:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2b3175027b49e338be601f4e9747f134 SHA-1: 4da540ed371acf11e0c2f70a058dfa43dba23c13 SHA-256: aaea6d9c1191e4b4438c8ec345ad60d4d5f68b62973f6504ad72057748c343a5
186 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a credential phishing lure impersonating Gmail. It also includes multiple external URIs, one of which is associated with a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to credential theft via a link to an abused redirector.

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
  • 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://gaturavokig.weebly.com/uploads/1/3/4/3/134317265/munopufarijip-jimunuxisadiru-kiziru-sojazalejesiras.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://resalured.ru/award?keyword=autocad+student+download+2018 PDF link annotation
    • http://wubopabezijoso.22web.org/sakurai_quantum_mechanics_table_of_contents.pdfIn PDF document text
    • http://fijixedi.22web.org/firefox_60._0._1.pdfIn PDF document text
    • http://kopawaruda.22web.org/difawilotanorugatiwejuka.pdfIn PDF document text
    • https://cdn.sqhk.co/rewufarelaze/9ChagjS/95099188656.pdfIn PDF document text
    • http://vabuzunaseridal.iblogger.org/witimiloxevojevulonev.pdfIn PDF document text
    • https://gaturavokig.weebly.com/uploads/1/3/4/3/134317265/munopufarijip-jimunuxisadiru-kiziru-sojazalejesiras.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zusobudem.epizy.com/ignou_assignment_submission_form.pdfIn PDF document text
    • http://bujisovi.epizy.com/variedades_linguisticas_en_el_peru.pdfIn PDF document text
    • http://bexiponezewan.rf.gd/17255497984.pdfIn PDF document text
    • http://denakisewir.epizy.com/24586182886.pdfIn PDF document text
    • http://vinixozu.rf.gd/tezakabukalonezato.pdfIn PDF document text
    • http://wajines.rf.gd/neranaketaxufujetavabo.pdfIn PDF document text
    • http://biwonopo.epizy.com/langara_island_lodge_fishing_report.pdfIn PDF document text
    • http://lavavoju.rf.gd/the_abandoned_empress_novel.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_off0000fc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC18 5440 bytes
SHA-256: 861f9d0b27096715577bc8e6db30c3aec9ef968c1fea8b589eff5558df506cd2
font_01_sfnt_off00010ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC1 11092 bytes
SHA-256: 3896b5471d16cb6c2feb7a89bac16cec16480dd12a963bcb0f6f6210c8cfba95