Malicious PDF — malware analysis report

Static analysis result for SHA-256 300ac243cc62834e…

MALICIOUS

PDF

73.8 KB Created: 2021-05-06 03:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3a455002dd2e6c5b3f489037b0ee377b SHA-1: d7b43dd0cedc3594f8245b8e152d19c047cb67bd SHA-256: 300ac243cc62834e5cd5cc6b201135074182bc2b812b213b5de4e041addd8ad0
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect users to potentially malicious sites.

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://zajinet.ru/strik?utm_term=how+often+is+the+fe+exam+offered PDF link annotation
    • http://kovuzaxaf.medianewsonline.com/28767356454.pdfIn PDF document text
    • https://cdn.sqhk.co/madumubo/gdR0jhf/68944274396.pdfIn PDF document text
    • http://my-favshope.online/fun_stress_management_activities_for_college_students1a5s2.pdfIn PDF document text
    • https://cdn.sqhk.co/pawosuku/bNjeeAw/audeze_mobius_software.pdfIn PDF document text
    • http://kotudekudoges.getenjoyment.net/caballo_de_troya_9.pdfIn PDF document text
    • http://nipawifaxupus.mygamesonline.org/samov.pdfIn PDF document text
    • http://kidupat.getenjoyment.net/tamofudidu.pdfIn PDF document text
    • http://nuverlites.online/tcl_tv_android_reviewttkjl.pdfIn PDF document text
    • http://jamotovoxut.mywebcommunity.org/sigma_bike_computer_with_cadence.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/51c8f7dc-81e8-4629-83ae-0d87a0c10dfb/eureka_easy_clean_stick_vacuum_images.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dca0f639-20e4-4f9b-b05e-f92a592b3154/wagirivuzizozevanegigiga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d5a5779-62d0-403a-be4c-c341ccec8279/77446546286.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b753fe6f-cd99-467d-8d67-23f880018a4a/rimogufuxafalaze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fb124a4-f822-4b19-b589-c677d728cc7b/66466565496.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81b9250a-0fc8-4798-b4df-05cbe6057b16/best_broan_range_hood.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68e600f4-d8c3-446d-9b82-7702458c9823/xowor.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_off0000e225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE225 5236 bytes
SHA-256: 3d75d8f7c6136fa0826ee17412dac26d7d639766f64b3db92616bab553a5792e
font_01_sfnt_off0000f3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DF 11304 bytes
SHA-256: e926ad14ac5f663c76ed18b5a5639570d2856573242fddf4ed81fdb427586ecd

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