Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef15cc768fd331b8…

MALICIOUS

PDF

75.8 KB Created: 2021-06-07 05:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c0917f7f807ff7bef85cf8ae3c3cf35b SHA-1: ae6ca96ec9c28c3a379d769c1a5a5b76373dfa07 SHA-256: ef15cc768fd331b820ea9e672cf6b4c13792a12120dfed5cb3c07a45153b1097
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. 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 0.9960

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://wastran.ru/pbw?utm_term=reddit+news+app PDF link annotation
    • https://sejimewopokotas.weebly.com/uploads/1/3/5/3/135350214/1096674.pdfIn PDF document text
    • https://tuxilumamiwuwuw.weebly.com/uploads/1/3/4/5/134582020/telekaronu.pdfIn PDF document text
    • https://fazodokivev.weebly.com/uploads/1/3/4/0/134018208/17aeb6ad.pdfIn PDF document text
    • https://dikurowewo.weebly.com/uploads/1/3/4/8/134893632/8c40ec3512dc3ab.pdfIn PDF document text
    • https://gafanobekifin.weebly.com/uploads/1/3/4/7/134768645/4214761.pdfIn PDF document text
    • https://kilokuvawap.weebly.com/uploads/1/3/0/8/130874431/3243151.pdfIn PDF document text
    • https://bisomimimuj.weebly.com/uploads/1/3/4/5/134526732/43c1fc0.pdfIn PDF document text
    • https://xowimigijik.weebly.com/uploads/1/3/1/6/131637135/lanidepasesukakaj.pdfIn PDF document text
    • https://xelenupexom.weebly.com/uploads/1/3/4/4/134480667/611e4faf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuvuwiro.pbworks.com/w/file/fetch/144725751/63454584851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ba0742b-07da-46b5-87fd-e706d924fb7b/47877283657.pdfIn PDF document text
    • http://lojefizowoj.pbworks.com/f/tenetovida.pdfIn PDF document text
    • http://xofitesu.pbworks.com/w/file/fetch/144755694/will_cyberpunk_be_censored_on_ps4.pdfIn PDF document text
    • http://raxonepem.pbworks.com/f/how_to_write_an_expression_in_expanded_form.pdfIn PDF document text
    • http://pulixojesu.pbworks.com/w/file/fetch/144567981/25349587413.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c23e73c-d627-42db-b7a1-a2abcbddd4ec/descargar_libros_de_budismo_gratis_en.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0230c659-066b-4f40-8191-8f5a29ac7af0/lavepabevajujewera.pdfIn PDF document text
    • http://ziludezubeju.pbworks.com/f/72807158222.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f6e127a-cc73-4e33-9166-cd5e3c9c9421/formulacion_y_evaluacion_de_proyectos_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5676370b-21d0-4ace-b1d9-6a605011eaa7/annabelle_2_full_movie_in_hindi_download_480p_filmywap.pdfIn PDF document text
    • http://bowawesup.pbworks.com/w/file/fetch/144644460/how_many_words_are_in_diary_of_a_wimpy_kid_hard_luck.pdfIn PDF document text
    • http://ropotupi.pbworks.com/f/6219163193.pdfIn PDF document text
    • http://nuxawakaxaz.pbworks.com/f/mathematics_for_business_and_personal_finance_glencoe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd4e8978-2354-4457-9304-b5bdd47ceeb7/110cc_atv_motor_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32d78a90-9b1b-47bd-b1d1-d98c1bbf427a/43432407754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8708b830-a50f-43d7-8f7a-7b8a62741653/compendio_catecismo_de_la_iglesia_catolica_descargar.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_off0000ebbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBD 4924 bytes
SHA-256: bee2aded5cfea1ed766c3f895ec92a148aafc0352e8e4599e160b289b3b393cb
font_01_sfnt_off0000fca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA8 10972 bytes
SHA-256: 11afbb423f4b6d5c0e62c60bbf9cc886dce07a2ac12924c4b988b9ba2be9be7f