Malicious PDF — malware analysis report

Static analysis result for SHA-256 267d2d8120ad4c1a…

MALICIOUS

PDF

77.0 KB Created: 2021-05-29 08:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 026b4a67c033d1e2b4df5310630c56fb SHA-1: 562864b8657deae828ba85f02d36baf22bc5b762 SHA-256: 267d2d8120ad4c1a4d66d65b48c129a8477e7371eb3fc49c28adca33aea7b5e0
186 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, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/123?utm_term=fragment+or+sentence+worksheet+pdf PDF link annotation
    • https://nosodawef.weebly.com/uploads/1/3/4/6/134693330/robumolage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475215/normal_603902ba917a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406777/normal_601673a18028a.pdfIn PDF document text
    • https://mamunazeve.weebly.com/uploads/1/3/0/8/130814121/pabezapakokiduw.pdfIn PDF document text
    • https://vetexugosopaviz.weebly.com/uploads/1/3/0/7/130738505/zajobobol-xovelatogota-komegigedifo.pdfIn PDF document text
    • https://pezilesuwubev.weebly.com/uploads/1/3/4/6/134639222/8516815.pdfIn PDF document text
    • https://xiwaxodo.weebly.com/uploads/1/3/4/3/134319271/a241521.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474448/normal_5fdb8fc2cc5b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488139/normal_5ffaf2ae8e0dd.pdfIn PDF document text
    • https://ronupajowosoza.weebly.com/uploads/1/3/4/8/134871490/022c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500893/normal_5ff497d472d1f.pdfIn PDF document text
    • https://miluxeto.weebly.com/uploads/1/3/5/3/135326788/2949310.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407316/normal_60228461952eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414357/normal_5fe52f279148e.pdfIn PDF document text
    • https://lukobojamema.weebly.com/uploads/1/3/4/3/134317851/8660773.pdfIn PDF document text
    • https://gibexiwufanoti.weebly.com/uploads/1/3/6/0/136099712/2082820.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481515/normal_5ff3a9093aac8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428331/normal_6059d8da3f7ab.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4422637/normal_60b11d357ad72.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/33f3f75d-9bdd-4b11-b2c8-31e0c72adbe1/how_much_does_a_2000_honda_shadow_1100_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60807d87-633d-4556-bc2d-eaf5da5b96ca/72139153580.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d91bc13-2dc8-4a38-bec7-e6521c0da87e/where_to_see_the_woman_in_the_window.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_off0000efa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA8 5648 bytes
SHA-256: eb46d5d7124b03111be4cb3a6f6bfb0028268bdcd8e2af23dea7cd943ddfd460
font_01_sfnt_off000102cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CF 10600 bytes
SHA-256: 2a5b486fc046a37bf0808737337258046173f4f21f16ee4a999dfd262eeb43d0