Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb63ef5f8d86af89…

MALICIOUS

PDF

77.4 KB Created: 2021-06-10 03:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: be478de988a20d084bd32206a8b8e19d SHA-1: 209380fcdecd801c8edbdda131ae5ef7816b4fc2 SHA-256: fb63ef5f8d86af89200e0c43e1a7a1ab492f7ad3955cc941551c966611a91d1d
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://huntic.ru/pbw?utm_term=binomial+distribution+questions+and+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369762/normal_60475c58eeb41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479210/normal_60bd7ded38631.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484631/normal_600c6508ef0f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388841/normal_6005b1452d130.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373008/normal_5fce4a90bc161.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373508/normal_5ff080e350a29.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4365628/normal_60b4447d63b31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456121/normal_602f7fee9a2e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451221/normal_602e36ac5ba0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416927/normal_6058e9eacd5b3.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/be8f2f33-6abc-4807-a80f-9bd93934f78b/87737884061.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5fb8127-9625-4c29-af69-79f60d80f824/wavobekekukinafuke.pdfIn PDF document text
    • http://mejigulo.pbworks.com/w/file/fetch/144729687/como_descargar_los_sims_4_y_todas_sus_expansiones_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94da6df8-8aec-4c8d-ae46-ddbe8afc0696/what_is_the_best_avatar_creator.pdfIn PDF document text
    • http://midevodimu.pbworks.com/w/file/fetch/144820449/51135536739.pdfIn PDF document text
    • http://vimadutukad.pbworks.com/w/file/fetch/144444093/yo_persigo_una_forma_ruben_dario.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b8bd5bb-0f50-45af-be2e-a5c72ce12308/baminilufajumetorupodem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cc7df76-57cc-4a65-b8fa-8c8636cc86e4/peavey_bandit_112_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/262e3f16-37b2-4174-b07e-8efaaec157fe/42410903558.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eeeb8d9-6e0f-443d-854d-b2c4fc65dfbf/mekamogarirawugowosala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/789743c7-1619-4dc2-a28a-7906ead17a7c/gear_circle_bluetooth.pdfIn PDF document text
    • http://mefijunov.pbworks.com/w/file/fetch/144419436/35090846562.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_off0000ef2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2E 5376 bytes
SHA-256: 5a04c71abe23077e20f10665e977e87ce9841a81f75c07fe2a57ea2fa336263d
font_01_sfnt_off00010165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10165 11212 bytes
SHA-256: ad956ec54c51eb9b932729522083e44583e5e75d84c858109e61a6295ce9b5d8