Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f90570eaa01588…

MALICIOUS

PDF

84.7 KB Created: 2021-06-03 18:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 5d890e5ee07b69c3d43df383fe8d4f0b SHA-1: 6d3456eef1d6d02c5ee521cab94eca78de468f21 SHA-256: b0f90570eaa01588f47d674d97498b755e042b28eff7ab9200f7d03d59a85cba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cructi.ru/pbw?utm_term=barcelona+vs+real+madrid+2020+results PDF link annotation
    • https://seporulakokifo.weebly.com/uploads/1/3/4/5/134590723/7580325.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414680/normal_5feb8d439d6fd.pdfIn PDF document text
    • https://jazafojof.weebly.com/uploads/1/3/4/3/134310209/luful_latafekupofiri.pdfIn PDF document text
    • https://pubefuxotup.weebly.com/uploads/1/3/4/2/134234554/2246899.pdfIn PDF document text
    • https://mipolapepel.weebly.com/uploads/1/3/4/3/134395859/jifebibakowi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376856/normal_600364d580ce9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376362/normal_60685210327e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408478/normal_606dbf308e717.pdfIn PDF document text
    • https://xevosafodom.weebly.com/uploads/1/3/4/7/134739965/314bd22d224.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454665/normal_605f44b066e6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453102/normal_60655e4cea27d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444113/normal_602750d266875.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://barumena.pbworks.com/f/gun_mayhem_2_unblocked_games_hacked.pdfIn PDF document text
    • http://zowonixepor.pbworks.com/f/dua_al_qunoot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cd178e8-4bce-4fe9-903a-a4a073abdbe7/65649634508.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df132483-e3e5-4976-8058-1a9be109629c/dolag.pdfIn PDF document text
    • http://xivoxibuza.pbworks.com/w/file/fetch/144560718/where_to_buy_designed_by_apple_in_california.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_off00010a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4B 5468 bytes
SHA-256: b3c679535cc38bbf78dd8125f2181d398a6f0f0a896fd7457d9a047463c9bf68
font_01_sfnt_off00011cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD0 12380 bytes
SHA-256: 620ed63c500ce9db5b02914a6a5a0fa263eafb7133b4cfa08001b00222238b53