Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56977f9f5adb5d3…

MALICIOUS

PDF

98.0 KB Created: 2021-03-08 19:45:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2d5b9368ed6be0d166fed50f23b2fd47 SHA-1: cc17c1eccab2f67125004d5ca7c017454b087abf SHA-256: f56977f9f5adb5d34b274dcb6c701578e0620712c768ef3b718f2b3a1e7a0232
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting and using UTM parameters, indicative of a link farm or SEO spam campaign. ClamAV and ML classifiers also flagged the file as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics suggest it's designed to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://botokaw.ru/123?utm_term=buncefield+incident+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373016/normal_5fdb9e2f6fdaa.pdfIn PDF document text
    • http://giwewigipebi.medianewsonline.com/60603393381.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504554/normal_5fd78aa078ae2.pdfIn PDF document text
    • http://mesutilixuta.sportsontheweb.net/xelonuwutoxabaki.pdfIn PDF document text
    • http://vasizazesunof.medianewsonline.com/alter_ego_b1_guide_pdagogique_gratuit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402720/normal_602f73c419f59.pdfIn PDF document text
    • http://lumobumekola.getenjoyment.net/david_walliams_family_history.pdfIn PDF document text
    • http://vuvopogawuxaxax.22web.org/annotated_outline_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_8e0a0814560e410ca3080d706910c189.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/47556501-b6b6-4235-bf9e-5e805b4d45a5/what_to_get_your_godparents_for_christmas.pdfIn PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_40311e8a86ff4273b2dfe1fca1b9a80b.pdf?index=trueIn PDF document text
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_df4ba0557c1c4a9eb3a6b40fc301c8fe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b216ac4-ac15-4ff0-b137-0639d04e4c97/23425826498.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed14e378-a9fa-498d-9104-922e0dc4865b/25014758580.pdfIn PDF document text
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_17561004235d4d75b83c5c590b9af131.pdf?index=trueIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_700f5aef768c42f6aea095c577702d30.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7baf6491-4e27-4dc4-9e85-cbed64824668/how_to_reset_a_galaxy_tablet_to_factory_settings.pdfIn PDF document text
    • http://gosaduzunake.myartsonline.com/ram_dass_books_be_here_now.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92bd9b3b-3f1d-4767-9edd-ec021e266f4f/casio_g-shock_ga-100c-1a3er.pdfIn PDF document text
    • http://fikikozazilut.rf.gd/pusutiritorizazivukotojez.pdfIn PDF document text
    • http://fizoluzakazuxaw.rf.gd/bayam_oru_payanam_hd_movie_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46da305a-8d49-4575-9820-c68c96a969fc/nivilowinalisevejonulaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d713c07-7fae-442a-ae18-a30eb9c3a784/69734851006.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_off000143b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143B9 4712 bytes
SHA-256: 6258d3a595f586b74cb879f5e50c001cadc0d73c4f8c17a26a9f8d6e85510a21
font_01_sfnt_off000153e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153E2 11520 bytes
SHA-256: f407981b8aaee1eb33fe645757c183bd8a42b92d2ff1b0702b4552af18efc472

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