Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d6415b9d7afb34…

MALICIOUS

PDF

83.3 KB Created: 2021-06-06 01:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: eb1f3bd5093099835a8e911e79e6f527 SHA-1: 734f5f5245ed6abb4d2376ae1dffd54c0265d964 SHA-256: c4d6415b9d7afb34f3c247bb06a12b0bfa9fb1df1822ce88bac33a2070e82596
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-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://nomylo.ru/pbw?utm_term=delay+don%2527t+deny+book+free+download PDF link annotation
    • https://rejosunofefi.weebly.com/uploads/1/3/0/8/130874376/8753424.pdfIn PDF document text
    • https://vabemeraronoj.weebly.com/uploads/1/3/1/4/131452983/wufozir_vibekobopigi.pdfIn PDF document text
    • https://serirufudo.weebly.com/uploads/1/3/4/7/134712976/4d26e3707bddbff.pdfIn PDF document text
    • https://lifexego.weebly.com/uploads/1/3/0/8/130874678/gemegane_misobusogekon.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/1f98dd14-6c22-4dc0-af78-564642cb4744/kaabil_movie_full_hd_download_filmywap.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/w/file/fetch/144424203/inshot_photo_editor_pro_mod_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa54ebe0-5497-4cfc-868b-64b3536a11bc/manual_de_operacion_aduanera_2018_sat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1c68830-23cd-4953-afbc-a39f423a3fa9/kabebasuxaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ca6d6bc-9328-4937-8797-64a4f8072ca0/61996337860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8707d243-58e9-460e-bdfa-650e4c0ffc36/12504374901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac2833cd-81fe-4cb0-a969-c65e08e0f291/wogizigufu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/158673c6-0a17-494c-989d-4d7021e7813c/dazupekoto.pdfIn PDF document text
    • http://ziriwuru.pbworks.com/f/47792496594.pdfIn PDF document text
    • http://xujefix.pbworks.com/f/guzuderasipikud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99090176-140a-4f53-ba9f-888bc93a3961/2012_uniform_plumbing_code_illustrated_training_manual_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/611ca9bf-525c-415e-9073-60c6666334d5/races_in_warhammer_total_war_3.pdfIn PDF document text
    • http://bofamawetodo.pbworks.com/f/riwiwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/742f3b40-a45d-46a1-96c5-d7f7ecdf839d/pexedijisukubifevif.pdfIn PDF document text
    • http://nuxawakaxaz.pbworks.com/w/file/fetch/144493383/ripogurelu.pdfIn PDF document text
    • http://memofemovo.pbworks.com/f/mawiniw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98d7c29a-35b0-4cb1-94a3-65cdba3e3321/how_to_swing_a_baseball_bat_faster.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144422907/vadage.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_off00010889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10889 5156 bytes
SHA-256: df3c4ae0cfe52ae5b616a6876392775731205a900d60a7ba24400e047f434921
font_01_sfnt_off00011a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4C 11260 bytes
SHA-256: 8392a57cfaf073a932f5b5f7700c46a7079968d2d1baf3a5da073e04dfc6ac4b