Malicious PDF — malware analysis report

Static analysis result for SHA-256 25538cf3df433e51…

MALICIOUS

PDF

77.9 KB Created: 2021-03-04 10:41:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4181fdb377537bdb09437b80aa4eea77 SHA-1: 89313162bafb64cb31bcf4c14c2b3576b54e76a3 SHA-256: 25538cf3df433e514010162cce8a0b96df72d54e7ff352d9d1e57efb20388029
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is designed to redirect users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/wix?keyword=first+strike+hero+2 PDF link annotation
    • http://tadezutalowebe.22web.org/9985022464.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417418/normal_6031dfeab7f2f.pdfIn PDF document text
    • http://fepaporipevari.mypressonline.com/91197484956.pdfIn PDF document text
    • http://kinatoguvekajux.22web.org/35906630243.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465000/normal_5ff20c958be04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409417/normal_602b9d032fa14.pdfIn PDF document text
    • http://liberum.sportsontheweb.net/xofafafikasaso.pdfIn PDF document text
    • http://fotulemeliluk.iblogger.org/87437062751.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/22353566918.pdfIn PDF document text
    • http://keniworu.mywebcommunity.org/asus_rt-ac66u_router_problems.pdfIn PDF document text
    • http://kajipim.mypressonline.com/mogivomelezopejok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gedimuta/27498108985.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/avg_antivirus_internet_security_free.pdfIn PDF document text
    • http://jobifizokugo.rf.gd/95472591690.pdfIn PDF document text
    • http://mukagodikuve.rf.gd/an_inspector_calls_bbc_watch_online_free.pdfIn PDF document text
    • http://kuwofeboxe.rf.gd/adding_and_subtracting_rational_numbers_word_problems_worksheet.pdfIn PDF document text
    • http://fedukiz.epizy.com/sally_s_beauty_supply_application.pdfIn PDF document text
    • http://wutesejib.onlinewebshop.net/91623821078.pdfIn PDF document text
    • http://kitalanexu.epizy.com/dejovosonopuze.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/sinunepaxutiw.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_off0000f839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF839 4680 bytes
SHA-256: 4aae3bce418d7798e91db025ae95837a51cc561288b0a75fd53fb705d7a9fcd9
font_01_sfnt_off00010824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10824 10096 bytes
SHA-256: 8aef4d918402be3a29ad74c19602755977b169fcd405b799169591327cd3cda8

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