Malicious PDF — malware analysis report

Static analysis result for SHA-256 4818d2d4e0be282a…

MALICIOUS

PDF

122.4 KB Created: 2021-03-16 09:41:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bb7b70c36dd09d9b798059f3fb327551 SHA-1: 242386878aa2d327590367ea83e9580ed065f01f SHA-256: 4818d2d4e0be282a5dd6274a8af154f63b61bc9ed9b73c65512fa1c07e2b2914
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting it is part of a link farm designed to drive traffic to potentially malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs and link farm heuristic point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/123?utm_term=drools+expert+user+guide PDF link annotation
    • https://xidiziwuzubiwon.weebly.com/uploads/1/3/4/6/134653180/sebesakemixogapapu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382613/normal_601fb100aed7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365563/normal_5fe1ee25ae94a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402517/normal_5ff9ac4b64472.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481168/normal_603dab3bb58ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483836/normal_5ff41842ce1c1.pdfIn PDF document text
    • https://bizotimugir.weebly.com/uploads/1/3/1/1/131164076/3707436.pdfIn PDF document text
    • https://ragurinibobuma.weebly.com/uploads/1/3/3/9/133986244/kufuvexofusisol_romiwak_wadafafuteweva_jobibaxejepanex.pdfIn PDF document text
    • https://xidiziwuzubiwon.weebly.com/uploads/1/3/4/6/134653180/dedc539dd3618.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393016/normal_60312689ec603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501645/normal_5fd5f5346a324.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449193/normal_602475bd17f07.pdfIn PDF document text
    • https://sedonefuwetupo.weebly.com/uploads/1/3/4/6/134669082/riramojam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498986/normal_604ae45b53ad8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_e8ca19bd589f4cb0bdbda9292436a414.pdf?index=trueIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_434898d07465444795f33567ece63f86.pdf?index=trueIn PDF document text
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_e5e938a3395a42a5ae5cd3d83f09d728.pdf?index=trueIn PDF document text
    • https://18b62485-dce0-4e35-9712-b1d1f13fcb23.filesusr.com/ugd/296484_47ad4bbafae5461c936bff2a7e33c307.pdf?index=trueIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_0e87abc608b84630b3dc594c642b774d.pdf?index=trueIn PDF document text
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_8c22c236c8f944a98b4d49d291fbeaf9.pdf?index=trueIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_8aa37b8d3a454e7f80137337a77b84cc.pdf?index=trueIn PDF document text
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_32f2962211474ad7a88944f1647ce330.pdf?index=trueIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_b18ede8a5d37467aa1451a556c233a35.pdf?index=trueIn PDF document text
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_f75028b96898433685417d20f235f170.pdf?index=trueIn PDF document text
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_064ab640fa7f4f938c255980ec123a07.pdf?index=trueIn PDF document text
    • https://55f5e71c-5f54-469f-9449-301c43944234.filesusr.com/ugd/bbdb65_145c5bb8c2cf4e33b6876ca3e33cdfce.pdf?index=trueIn 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_off0001a077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A077 4984 bytes
SHA-256: 52aec1f1e510a74b3f0a96f50f0d42a28e3112b7182fc07af30d6e4c508c32af
font_01_sfnt_off0001b185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B185 12440 bytes
SHA-256: 2855874cb2c790f37941be4594660bf929c7c2e7a957f7e9120560bbe4121665

Open this report in the interactive analyzer, or submit your own file for analysis.