Malicious PDF — malware analysis report

Static analysis result for SHA-256 a65c1f8a958da8e1…

MALICIOUS

PDF

85.7 KB Created: 2021-05-29 04:41:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 61499dcf4716298fa1a6203f169b0c08 SHA-1: 5d1e819cff805cc000947a9ae4df29f1b45a22ca SHA-256: a65c1f8a958da8e15c9b8939a460f3751d786a551258fe60547d9ed534dd6ad2
194 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution lure, likely leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/123?utm_term=hafele+catalogue+2016+pdf PDF link annotation
    • https://voxonevixes.weebly.com/uploads/1/3/4/3/134383310/xaxelixatetasamoju.pdfIn PDF document text
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/1140518.pdfIn PDF document text
    • https://menekagamop.weebly.com/uploads/1/3/4/0/134097565/texifukiroriret.pdfIn PDF document text
    • https://senaduwofajix.weebly.com/uploads/1/3/0/7/130775021/bonikixajivudubisiji.pdfIn PDF document text
    • https://laganavixafalos.weebly.com/uploads/1/3/5/3/135341912/1390197.pdfIn PDF document text
    • https://degufulu.weebly.com/uploads/1/3/1/3/131379990/5757369d.pdfIn PDF document text
    • https://tilinonulubun.weebly.com/uploads/1/3/4/6/134614078/gefeterifi_muwoba_tipoz_natag.pdfIn PDF document text
    • https://detabifaf.weebly.com/uploads/1/3/1/4/131436978/pirolukavojakem.pdfIn PDF document text
    • https://jofajode.weebly.com/uploads/1/3/5/3/135346524/d6141f79.pdfIn PDF document text
    • https://tumurotijom.weebly.com/uploads/1/3/4/5/134512141/a6f8ad33bc.pdfIn PDF document text
    • https://ligizedafovawu.weebly.com/uploads/1/3/2/6/132680967/ed199e8f62b5.pdfIn PDF document text
    • https://wadidomewagu.weebly.com/uploads/1/3/2/6/132681938/mevipatirenus_worogutokizediz.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/5670ec52-358f-4dcd-9623-e1546f165154/zugufilaxupekaxarug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4f3a861-4853-42ae-a75e-0e93300ae5fe/55846825165.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7982ec56-e2e5-4c55-8a76-b69d3e800f39/55197939404.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/813bb6c1-3ddc-43ab-b9cb-ab00f1145312/54521334180.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7a0eae3-321f-4d10-982c-7387ef3047c0/bemekolovanepowev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/969c8849-5be8-4678-812c-f5db7eaac554/plantillas_de_letras_grandes_para_imprimir_y_recortar_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8bc876b-a6d9-46fd-aadd-49d38f8229a2/jifajowax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bfd2607-f83f-4e82-8f59-5a137f31994c/galudotadunizilobe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ac9b47d-6d7e-454d-82d0-3bc0e010092f/zekumojixuruvemiv.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_off000102ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EA 5488 bytes
SHA-256: b3cef9bb679f4ae893900f89ae1ffe27183ae64d0cf58441cdb26ab68082de51
font_01_sfnt_off000115b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B3 19900 bytes
SHA-256: 0f104c909477e31213e41cfb57fe233a40c4be0a1e007c87cdcdd683e5c12475