Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ed82124d9141c5…

MALICIOUS

PDF

83.8 KB Created: 2021-05-07 13:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: edeb8d2cc07fcd14d6f9f557bf363429 SHA-1: 5196d35b0f9877a6f7f255b331cb88021014b6ba SHA-256: 91ed82124d9141c5dbab0f0d3a31be0ac3c679b0655f67769cac226c0e438e34
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9992

Heuristics 5

  • 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 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://druttle.ru/strik?utm_term=fl+studio+20+producer+edition+for+sale PDF link annotation
    • https://cdn.sqhk.co/dipewoduge/a2ribhc/music_chat_rooms_free_no_registration.pdfIn PDF document text
    • http://mozobadijoba.medianewsonline.com/93062919923.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/c0RkEhf/wimafodedesiwezosugolu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444123/normal_5ffc927ca40c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448540/normal_60430f43a708e.pdfIn PDF document text
    • https://cdn.sqhk.co/tamurikubol/bjaQM40/netflix_dvd_plan_movie_list.pdfIn PDF document text
    • http://rezolawanelu.sportsontheweb.net/muwir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451206/normal_605caeef62ba0.pdfIn PDF document text
    • http://ropejolun.iblogger.org/75997363069.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492259/normal_5fe76d13566cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380237/normal_6045c0564a8f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371786/normal_5fe52752f3249.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416496/normal_5ff926c88c635.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451766/normal_5feef900a95d2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://segixiw.epizy.com/25949022693.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54ea1e8d-80d4-4eab-9787-12ed1a18ffc7/nonase.pdfIn PDF document text
    • http://gowizubemi.epizy.com/revit_architecture_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a89387e9-bd4e-4d90-afd0-d05bb3673cf6/derubataxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be044958-15f3-4521-8dec-3a2d899f3d4f/marefituberelerosim.pdfIn PDF document text
    • http://kuwitabetegipo.myartsonline.com/2629241579.pdfIn PDF document text
    • http://lewemezitena.rf.gd/giwuje.pdfIn PDF document text
    • http://kazigolukujo.epizy.com/urdu_books_free_download_sites.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c04d076-c238-4f5c-ba41-e9d24c5cd2bb/jironolosowomavigotukan.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAF 5260 bytes
SHA-256: 99b3536e5a59f4a7fddada0b7243089fbcfc3655485081b29ccafd546a79b3a7
font_01_sfnt_off00010d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D96 11148 bytes
SHA-256: c2f9e8f1cfa79c10aedf2c8be15044ffdbd6a4e88cd500f7fdd85be625fb5cff
font_02_sfnt_off00013387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13387 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f