Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a6e5065e618864…

MALICIOUS

PDF

85.3 KB Created: 2021-02-20 01:20:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 06212a6f3f1627c51fc0c4ff7dcc2987 SHA-1: 49d304a181f2a9459c70df0290bc60e0847a9897 SHA-256: 27a6e5065e6188640e7cac4245e5623deebf5f6036fe512ef3d05c05c0bfaa4c
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains or link farms, suggesting a SEO spam or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain keywords related to online games, likely as a lure to attract users to the linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wix?keyword=high+level+barrows+guide+osrs PDF link annotation
    • https://cdn.sqhk.co/mogowepuw/ijAgiO9/zebixuz.pdfIn PDF document text
    • https://vomudata.weebly.com/uploads/1/3/2/7/132740307/pekuxuralab.pdfIn PDF document text
    • https://dapalirodo.weebly.com/uploads/1/3/1/4/131483520/8580855.pdfIn PDF document text
    • https://cdn.sqhk.co/bubuzibiv/Hjdgejh/rocket_launch_florida_today_countdown_clock.pdfIn PDF document text
    • http://jiviwizun.iblogger.org/79647611920.pdfIn PDF document text
    • https://zakikubefetopu.weebly.com/uploads/1/3/2/6/132696201/kuzojemenete-zafetusi.pdfIn PDF document text
    • https://cdn.sqhk.co/fabukujeb/fUIjbhh/lumibem.pdfIn PDF document text
    • https://cdn.sqhk.co/mukibusu/XhftUgg/business_accounting_courses_online.pdfIn PDF document text
    • https://cdn.sqhk.co/nafumozuwe/Rljhih9/wojojenevojeluxezikis.pdfIn PDF document text
    • https://cdn.sqhk.co/sezelijimofi/ZFHJpVT/21443148746.pdfIn PDF document text
    • https://wexasubofuxumeb.weebly.com/uploads/1/3/2/7/132740188/7889007.pdfIn PDF document text
    • http://kaxidabifibag.iblogger.org/lezixidoraxoxulesude.pdfIn PDF document text
    • https://cdn.sqhk.co/litalile/ibYg4gi/appleton_mn_weather_10_day_forecast.pdfIn PDF document text
    • https://gatepeduvemixif.weebly.com/uploads/1/3/4/6/134669895/vogebugunotugozu.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/jaRzahg/83514782534.pdfIn PDF document text
    • https://mevepabazeme.weebly.com/uploads/1/3/4/0/134013418/kulazovepabu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458621/normal_6007be6940ae0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kewugozosefo.epizy.com/duxurijora.pdfIn PDF document text
    • http://zifofupox.rf.gd/donkey_milk_sheet_mask.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_off0001126c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126C 5340 bytes
SHA-256: 9a0f84450d41a51938a6135713f55b2b0bc33d382a67715f0b52fdc2369f5a77
font_01_sfnt_off0001249d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249D 10240 bytes
SHA-256: d6f66cacd747f834099050bc0a488acefb90be2d448575e2c2da5e552d9ac66a

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