Malicious PDF — malware analysis report

Static analysis result for SHA-256 9546bf1bdfb13e02…

MALICIOUS

PDF

87.6 KB Created: 2021-06-03 22:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 146b6002e3b54411ab2114301f009538 SHA-1: 7381613f88dec55327a1a21ccb28e1bad7b3b84e SHA-256: 9546bf1bdfb13e0242dd174b4e3bc0c26690dc7484687bc1c663f8e814a82284
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 0.9997

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://queure.ru/pbw?utm_term=que+es+disruptivo+ejemplo PDF link annotation
    • https://rufisagaga.weebly.com/uploads/1/3/4/3/134309951/2381789.pdfIn PDF document text
    • https://revugegan.weebly.com/uploads/1/3/4/6/134682990/zuzid_dugapelapikef_kopuvevonu.pdfIn PDF document text
    • https://sozuxeboniwuk.weebly.com/uploads/1/3/1/3/131381135/xogekodi.pdfIn PDF document text
    • https://tisavivo.weebly.com/uploads/1/3/4/0/134040567/2c8c7e9bb5d7.pdfIn PDF document text
    • https://kizegugiruliti.weebly.com/uploads/1/3/4/7/134729255/tujizositip_pomokadojel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413969/normal_605e04f379c78.pdfIn PDF document text
    • https://nimukitu.weebly.com/uploads/1/3/4/2/134266418/642160.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4378410/normal_60b4f13dc27e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502567/normal_6013a9dde4c7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374518/normal_5feb23d362b5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371265/normal_600b58a5afe32.pdfIn PDF document text
    • https://suwagapijewes.weebly.com/uploads/1/3/2/6/132682436/rilanujitujo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sejiliki.pbworks.com/w/file/fetch/144553788/how_to_activate_jio_wifi_calling_in_android.pdfIn PDF document text
    • http://mefijunov.pbworks.com/w/file/fetch/144420576/toddler_cape_coat_pattern.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9627a41b-05f6-4644-8300-342d7ce07854/19686666986.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/w/file/fetch/144424236/can_you_lock_specific_cells_in_google_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fc11d23-3756-4ba9-a99d-0c1a9be903c2/best_statistics_and_probability_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0bb9cf3-efbd-44c2-9e20-34a00b963c16/30210827716.pdfIn PDF document text
    • http://zajozote.pbworks.com/w/file/fetch/144438813/short_reading_comprehension_for_grade_5_with_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b03c2a16-87ac-4d85-a6b4-cb25df3d9061/how_to_breakdown_a_winchester_model_94.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f500543f-a8c6-4269-9291-8420353649a1/comparative_guide_to_nutritional_supplements_lyle_macwilliam.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_off0001173c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173C 5092 bytes
SHA-256: c01f06557761025d0db236e153ae32bf698736c547503dcfad5e6f45e3eb127a
font_01_sfnt_off00012883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12883 12112 bytes
SHA-256: 84b86d63f3f9a4e5ffe7bb02c3027f7b1e9915ea9044ed96649837abd2577c58