Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a84627d4350f3c…

MALICIOUS

PDF

90.1 KB Created: 2021-06-13 10:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 94c450f5cdd64f7b472c51f9a682cae7 SHA-1: 5f81aa1277d51507f0d1f552401e632868b48120 SHA-256: f1a84627d4350f3c609caa995206786358253ae533ee790b9633828e541856b4
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which point to disposable hosting, suggesting a link farm or phishing operation. The primary URL observed is 'https://irlanc.ru/pbw?utm_term=answers+for+gotranscript'. No scripts were extracted, but the PDF structure and link farm heuristic indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://irlanc.ru/pbw?utm_term=answers+for+gotranscript PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387430/normal_60689b0957cd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476152/normal_60bfdb9565df1.pdfIn PDF document text
    • https://kerijifulonuf.weebly.com/uploads/1/3/5/3/135328136/566df55f875b0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498366/normal_602096768f93e.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4495269/normal_60b49bd730b07.pdfIn PDF document text
    • https://bodizolisasutez.weebly.com/uploads/1/3/1/8/131871954/1690241.pdfIn PDF document text
    • https://vefujavud.weebly.com/uploads/1/3/4/8/134857174/jozujujilazanom-vulosixegodil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463803/normal_601fe261ce531.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455657/normal_602a762bb59dd.pdfIn PDF document text
    • https://beperupofifu.weebly.com/uploads/1/3/1/6/131636755/bfefa775c532.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443809/normal_6063bd0f32c05.pdfIn PDF document text
    • https://zodijezuworid.weebly.com/uploads/1/3/1/4/131483265/norava.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/3fdfe676-8f5f-4c90-8003-b8db47b4483b/mifugavuduxokeropale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24046532-797f-4c07-ac20-d206c70ece98/kapu_kuialua_fight.pdfIn PDF document text
    • http://sozevupegufi.pbworks.com/w/file/fetch/144848967/sibuguzevema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8c40dd4-9507-4bba-b1d8-c6e8e20165c6/94341847749.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db87bb7d-ec41-4035-9473-a14074826278/.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcf48691-147a-4512-85d7-9e80c20c7442/spanish_english_translation_app_offline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2f3028d-6243-4577-8232-77a263653f9d/five_nights_at_freddys_custom_night_game_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed270ef9-d002-41c6-9627-8a6c46989bcd/1197908212.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a65b6802-b20d-4f36-a286-4be3d27fef69/lekudirozuzepibujeke.pdfIn PDF document text
    • http://kudugoviva.pbworks.com/f/29786885787.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6548c0e-2940-4f25-9134-6aeecb3c463f/jugifurimaxodotuw.pdfIn PDF document text
    • http://kokoxudalux.pbworks.com/f/40906205778.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_off00011fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD1 5232 bytes
SHA-256: ecaec682f39c35e9346a15dc4a9fff4af4c04954e6356437e81a8a6a7a41d6b8
font_01_sfnt_off000131c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C9 11764 bytes
SHA-256: e3223288e7ef73432e319bfe37acc683192ecd829d0421907be7bae79bf4c776