Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f70c1f26ecccd05…

MALICIOUS

PDF

75.9 KB Created: 2021-02-10 00:09:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 229b205ff7a7b82644136f21844ddd01 SHA-1: 3f329ad012e8daf0caac0d53f4fa1bec7d944fd3 SHA-256: 9f70c1f26ecccd05a5e5fd502c4949871c97bfc7e92cd443cb46633b30a86707
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal a significant number of external links pointing to disposable domains, suggesting a link farm designed to manipulate search engine results or distribute further payloads. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URLs strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/aws?utm_term=any+reported+cases+of+zika+in+cancun PDF link annotation
    • https://lezanaxowap.weebly.com/uploads/1/3/2/6/132696506/9705455.pdfIn PDF document text
    • http://stroiline74.ru/snow_slopes_australiaa0gkl.pdfIn PDF document text
    • http://org-fruit.space/89615285818jt0ld.pdfIn PDF document text
    • https://xafokevixutevib.weebly.com/uploads/1/3/2/6/132681308/3869879.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447663/normal_5fd7b525ab0d9.pdfIn PDF document text
    • https://dunudafulu.weebly.com/uploads/1/3/1/0/131071166/jufumip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426418/normal_601e01c90f168.pdfIn PDF document text
    • https://lenapejasuma.weebly.com/uploads/1/3/4/7/134749539/rikededuseti-zojusezajoke-firanesokad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469617/normal_5fec0f2ebeff6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499319/normal_5fc9e9b416999.pdfIn PDF document text
    • https://ruwawakutiro.weebly.com/uploads/1/3/0/8/130874672/3667929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485939/normal_60158087480ff.pdfIn PDF document text
    • http://cookwellbakewell.com/roadstar_navigasyon_gncelleme_program_indirjf0fj.pdfIn PDF document text
    • https://levapexufusetij.weebly.com/uploads/1/3/4/9/134904519/8728867.pdfIn PDF document text
    • http://realnoe-obshenie.online/wedding_invitation_email_template_freekt9tm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376354/normal_6004994a6f364.pdfIn PDF document text
    • https://pafajawu.weebly.com/uploads/1/3/2/6/132682051/1afac4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392668/normal_6016f0cb9ed73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385028/normal_5fcac990ea909.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lapojuvide.epizy.com/zewun.pdfIn PDF document text
    • http://zewupubo.rf.gd/wejikuponida.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_off0000ec3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3C 5324 bytes
SHA-256: a8a880f23e51664559b9ac090a7e4e5e523e1d1d92f4b44dbf45769a623f4173
font_01_sfnt_off0000fe7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7F 10556 bytes
SHA-256: 995d5abe0fd7c8c8e9b32dc3fbac74e5a5a853713456fc706b63f944621159a3