Malicious PDF — malware analysis report

Static analysis result for SHA-256 661509a0cfdf6adf…

MALICIOUS

PDF

80.5 KB Created: 2021-03-23 19:28:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf94ae7c994fa0e76b6409f791ab9ca1 SHA-1: 6b0e7882e4995cd50d029c1eb88da4af40d92071 SHA-256: 661509a0cfdf6adf9866e8b3609b5e81586f6083901167d3d47987adf5d88207
194 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or malware delivery. No scripts were extracted, but the PDF structure and embedded URLs point to a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=practicing+the+presence+of+god+by+brother+andrew
    • https://sixexarujizevav.weebly.com/uploads/1/3/4/5/134584368/matopal-zepixonilot-xilexuzata-sudorivufipitu.pdf
    • https://wadagoxegoti.weebly.com/uploads/1/3/4/3/134385229/solobovoxu.pdf
    • https://cdn.sqhk.co/surikuzezun/SgdjePU/background_video_recorder_2020.pdf
    • http://ropufogesuzazeg.iblogger.org/barewewamuri.pdf
    • https://tegidaweriwasul.weebly.com/uploads/1/3/1/4/131483440/baraj_dasuti_sigigipelud.pdf
    • http://vogujefaxuwel.22web.org/ruzerobusorifevizo.pdf
    • https://nabikiwajozipaf.weebly.com/uploads/1/3/5/3/135391661/8118340dc.pdf
    • https://xixasoxi.weebly.com/uploads/1/3/5/3/135324484/8184347.pdf
    • https://rivupabageram.weebly.com/uploads/1/3/5/3/135323939/76d02e27518b5.pdf
    • https://cdn.sqhk.co/vabedesi/mhbXaJ8/documents_for_wear_os_android_wear.pdf
    • https://cdn.sqhk.co/junibukison/gLiaJ43/deadpool_1_tamil_movie_in_isaimini.pdf
    • https://guvolobojifo.weebly.com/uploads/1/3/4/7/134733869/wopar.pdf
    • https://vemugalibi.weebly.com/uploads/1/3/4/4/134484787/777df4f9ebeacc2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mulirogikek.epizy.com/spring_boot_microservices_with_docker.pdf
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_419aca4c636a4e40ba0c4aaeb69374af.pdf?index=true
    • https://badbb018-ab4e-499b-b788-960949b82e3d.filesusr.com/ugd/4f4c56_f5c7233abc9a42aebc3ab22c3c015831.pdf?index=true
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_1f50cf9227594459931184865e5b178d.pdf?index=true
    • http://fojoxolizono.rf.gd/retuxegikugo.pdf
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_ec697ecfa8364ef3aaede7ff1171e20c.pdf?index=true
    • http://tivapatovike.epizy.com/google_report_phishing_email_address.pdf
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_ad6167713a7c4ccf90c270af8624d1f6.pdf?index=true
    • http://tubujozuvos.epizy.com/8940851403.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8c8.bin
f3f2dafda7ea43dcfae679802300af4b7c91cedfadbae0e94c4faa059bdecd5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C8 5720 bytes
font_01_sfnt_off00010c48.bin
9f15d886944deda445e6c911028000a02c21fe3775f8eb0a4bcb08ba84c5560c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C48 11688 bytes

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