Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec27d004caa8d72…

MALICIOUS

PDF

75.0 KB Created: 2021-03-01 02:26:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: cb7b61fc0a086f156a53a76892b572f3 SHA-1: 205703ab59361554ff6bdeae82b3d23bdd200713 SHA-256: fec27d004caa8d72e049e281822939462475d59fdec73a30e05c0559193f8b25
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. Many of these links point to disposable hosting or domains that appear to be part of a link farm. The ML classifier also flagged this PDF as malicious with high confidence. The primary purpose appears to be directing users to a large number of external resources, likely for SEO manipulation or to serve as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://lozipotod.ru/123?utm_term=best+power+supply+for+hx+stomp PDF link annotation
    • https://cdn.sqhk.co/detaludolef/jhbjaii/40024310675.pdfIn PDF document text
    • https://cdn.sqhk.co/poxirowo/x9SOgiw/kiregoxogudebamuv.pdfIn PDF document text
    • https://dovenokitumenu.weebly.com/uploads/1/3/1/4/131482991/rawigajivug.pdfIn PDF document text
    • http://pakekoramiduwin.getenjoyment.net/danby_window_air_conditioner_costco_manual.pdfIn PDF document text
    • https://nenejiremox.weebly.com/uploads/1/3/0/9/130969141/04d3508a.pdfIn PDF document text
    • https://cdn.sqhk.co/folamudoj/iNijsVx/tuning_fork_set_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/0oWechf/rc_mudding_trucks_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/igMMhfv/98514999545.pdfIn PDF document text
    • http://laluwaraselolar.mywebcommunity.org/iso_ts_16949_version_2002.pdfIn PDF document text
    • https://xorodipilubila.weebly.com/uploads/1/3/5/3/135311864/7339720.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ximupuv/nalozukovuzemevaja.pdfIn PDF document text
    • http://gupizamowakop.myartsonline.com/56988052956.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/noxebixaxobefizewafege.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/children_s_apperception_test_sample_report.pdfIn PDF document text
    • http://serepuzokoz.epizy.com/89979419237.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_off0000e8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F1 5244 bytes
SHA-256: c577b0d9e92ae8d254f982db5adca94d2f3ba1b3d404ed4e064ce5150ca616bd
font_01_sfnt_off0000fabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 10556 bytes
SHA-256: 3eaae827ee8471f910cd0e2c3cab6882d165f7425ac9ac184033d325f2ff7a07

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