Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b51d83e303e9d6b…

MALICIOUS

PDF

86.7 KB Created: 2021-05-22 01:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c5ceb5f7e6f686c3ed46bdf7bf615174 SHA-1: eeedd90d2e427ad8bfc792430170a23192c43ca5 SHA-256: 8b51d83e303e9d6b9031e616b490793584d6ee16af8f89adedf2efb9b7318ebe
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The embedded URLs, such as 'https://zajinet.ru/strik?utm_term=quality+function+deployment+adalah+pdf', are likely part of this redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://zajinet.ru/strik?utm_term=quality+function+deployment+adalah+pdf PDF link annotation
    • https://pemolodubi.weebly.com/uploads/1/3/6/0/136052155/wetuwobimifiga.pdfIn PDF document text
    • https://bewogataxatux.weebly.com/uploads/1/3/2/6/132695278/cf372c0b369990d.pdfIn PDF document text
    • https://xolejapu.weebly.com/uploads/1/3/4/4/134491856/tuxidugafonuparulafi.pdfIn PDF document text
    • https://lizelizana.weebly.com/uploads/1/3/1/4/131409616/8f5cd8c.pdfIn PDF document text
    • https://tolawururajetam.weebly.com/uploads/1/3/4/8/134883146/wusanixiguzujagig.pdfIn PDF document text
    • https://wafodefa.weebly.com/uploads/1/3/4/4/134480145/bozexedi.pdfIn PDF document text
    • https://kabuvegezukab.weebly.com/uploads/1/3/5/3/135325093/timiwa_metavigitetabu_suvoponek.pdfIn PDF document text
    • https://wunovolal.weebly.com/uploads/1/3/5/3/135311751/zipolisu.pdfIn PDF document text
    • https://fatatarulawug.weebly.com/uploads/1/3/4/4/134474158/wasugafabosena.pdfIn PDF document text
    • https://nasipowo.weebly.com/uploads/1/3/1/3/131383467/ginarugufovel.pdfIn PDF document text
    • https://jotovaxawunujej.weebly.com/uploads/1/3/1/8/131856347/6820357.pdfIn PDF document text
    • https://misikeni.weebly.com/uploads/1/3/4/3/134336029/sukotelov.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/bbe7cf15-0e81-43e6-918f-f4f3fa0e5900/13513215446.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/groformat_fotos_drucken.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/el_conde_de_montecristo_pelicula_completa_espaol_latino_descargar.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/sumanadujakosivolobat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaae1b7e-2774-4136-ba86-a8bbb4fe65b7/indiana_plagiarism_test_answers_2020_quizlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffbdadd0-9317-40d7-8379-deff2e88c043/what_is_climate_change_according_to_ipcc.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/lenguaje_corporal_significado_de_miradas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37f4f72d-ebc0-4199-9f7d-65002eefe889/13083006192.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/unscramble_spanish_words_answers.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_off0001157c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157C 5284 bytes
SHA-256: 304b39ae840e578ed847ffdf80d8a3e1f6c485d56138faaf4c9424cc9be1bd96
font_01_sfnt_off00012761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12761 11312 bytes
SHA-256: b977dad2a547a766e136357ce3c136820051354039af2347c831611bf47d997e