Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb86636faea9b816…

MALICIOUS

PDF

84.8 KB Created: 2021-05-03 03:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f3467338c29eee54d33efc981c17043a SHA-1: 0410b9271f6964f10f6cbf15d4f5cb04e3822969 SHA-256: eb86636faea9b816a91b05b00a6f084643ac51e73fef132fac8c0561a7b55e5f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs, such as https://jacksth.ru/strik?utm_term=body+language+book+by+fbi+agent, are the primary indicators of this malicious activity.

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://jacksth.ru/strik?utm_term=body+language+book+by+fbi+agent PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413707/normal_5fe65fec93452.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476750/normal_6029cd972e76e.pdfIn PDF document text
    • https://kadezejuvi.weebly.com/uploads/1/3/4/6/134603763/24488ba2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499622/normal_606ac53be6171.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367668/normal_605475873d7a1.pdfIn PDF document text
    • https://zuxobopabure.weebly.com/uploads/1/3/4/3/134344154/sozakekozuwug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479673/normal_5fcb6aa2ba9dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413228/normal_5ff9e77c13c8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489054/normal_604666bdd9ea7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466153/normal_60003b813d09a.pdfIn PDF document text
    • https://turamidiwirak.weebly.com/uploads/1/3/4/3/134340523/9584944.pdfIn PDF document text
    • https://vebuleme.weebly.com/uploads/1/3/4/3/134321641/7499076.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387562/normal_602e7fbd2fd66.pdfIn PDF document text
    • https://xenesadu.weebly.com/uploads/1/3/0/7/130739949/roveneb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416671/normal_5fde3ed0affd6.pdfIn PDF document text
    • https://kuromazu.weebly.com/uploads/1/3/2/6/132695519/doxasir_guvomobipimoj_zotabidob_rumagugomapewed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453329/normal_604460ed552a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420924/normal_603af697ba09d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474176/normal_6009a7e3427de.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/30e503ae-a3ff-47d8-9328-84e0c0b103d1/what_is_the_best_free_animation_software_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e9c6305-c83f-4aa2-a278-b57c2af12810/logitech_s715i_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27581ef7-ac7f-4d6b-b074-fe94c220f881/92726342731.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_off00010db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB4 5156 bytes
SHA-256: c05970904592b448f922f27dc947d5ce55080881aa886acaf1db19e6c80ea667
font_01_sfnt_off00011f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6A 11232 bytes
SHA-256: cbe66a19804d64cc2147d290a2b6e87ce239fd659ab35a798e4c4fc0cc1b4e6b