PDF malware analysis — malicious · b4732a5e74795d5c

MALICIOUS

PDF

77.8 KB Created: 2021-05-20 01:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23

MD5: 2a292ce95cf665e7896e699d555573d6 SHA-1: da7270b8a9241b1e97cb715c557f51c5606ecad8 SHA-256: b4732a5e74795d5c27a7ed0bca7c9d0cb5ac778eca6e20429ec0ea94cbe34539

216 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document employs social engineering tactics, impersonating a cloud file-sharing service to trick users into installing a browser extension or update. The presence of numerous external links, many pointing to PDF files on file-sharing platforms, suggests a link farm or distribution mechanism for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the download and execution of a second-stage payload via embedded JavaScript or external URLs.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 7

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.
Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE

Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
Cloud document impersonation lure medium SE_CLOUD_DOC_LURE

Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
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://druttle.ru/strik?utm_term=how+to+unshare+a+google+drive+folder PDF link annotation
- https://veborejekeraleb.weebly.com/uploads/1/3/4/4/134480613/825304.pdfIn PDF document text
- https://falojixij.weebly.com/uploads/1/3/4/8/134878909/tonesopofi_mesub.pdfIn PDF document text
- https://sefusozikoju.weebly.com/uploads/1/3/4/3/134366316/4919645.pdfIn PDF document text
- https://fifikasato.weebly.com/uploads/1/3/1/4/131437502/tasadigufegik.pdfIn PDF document text
- https://mexasazage.weebly.com/uploads/1/3/4/5/134513067/zepuzisupurara-jukaregoba-zexomazowutik.pdfIn PDF document text
- https://jabukosiw.weebly.com/uploads/1/3/0/8/130874379/vepaporeb.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/cf263e6f-38fe-4322-93e4-2425825c1d1d/75191107964.pdfIn PDF document text
- https://s3.amazonaws.com/ginutu/633205011.pdfIn PDF document text
- https://s3.amazonaws.com/bokofapig/vozokajo.pdfIn PDF document text
- https://s3.amazonaws.com/wavunot/panasonic_kx_tgp550_ip_address.pdfIn PDF document text
- https://s3.amazonaws.com/sigobija/11498221066.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/9ce2ccf1-c2bb-4658-9172-4668022e442f/tipo_de_sistemas_operativos_y_sus_caracteristicas.pdfIn PDF document text
- https://s3.amazonaws.com/gewisetug/a_m_u_ka_full_form.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/b50284f3-cd2d-46dc-aa7e-5b0da9227f5d/womufiruf.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/876637c9-b2f1-484b-8c99-f959dc016e61/jumpstart_to_skinny_bob_harper_results.pdfIn PDF document text
- https://s3.amazonaws.com/xozeb/wosoguketotasutumarope.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/3cab0a9c-ad51-455a-8c8d-9466065c6a79/el_reino_de_este_mundo_analisis_por_capitulos.pdfIn PDF document text
- https://s3.amazonaws.com/setaxilitozuko/letazajerugulinisozasemo.pdfIn PDF document text
- https://s3.amazonaws.com/pokixovuxik/99976320409.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/7269bdfc-bd1d-4330-b081-145b133848bf/23333104413.pdfIn PDF document text
- https://s3.amazonaws.com/pezofut/english_as_a_second_language_grammar_book.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f401.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF401	5284 bytes
SHA-256: `a5626cc31562c0b343496c3dbaedecba4c44373977ee0f7a0816cdcf9bdcd9b6`
`font_01_sfnt_off00010609.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10609	10500 bytes
SHA-256: `73173ce68632b4bdc6c7a34ecdf8272845e6cca5f52749b30050d2e143e5e3ea`

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