Malicious PDF — malware analysis report

Static analysis result for SHA-256 8333d37f8ee30d0c…

MALICIOUS

PDF

101.3 KB Created: 2021-02-17 06:20:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 788bb2a4f3928d8745269f8649f0297c SHA-1: 7bd308c3a765a9ffbc064121af6d5aecb64de61e SHA-256: 8333d37f8ee30d0c3f6bd7d2f9e5772d790657516d70e03b6427e506113f8635
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it is designed to redirect users to 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://jottigo.ru/aws?utm_term=belkin+n450+db+wireless+bridge PDF link annotation
    • http://wimazosuwoxugij.66ghz.com/spreadsheet_applications_fbla.pdfIn PDF document text
    • https://kipunazumalimak.weebly.com/uploads/1/3/4/7/134755782/af30e2dc031.pdfIn PDF document text
    • https://wiwufupa.weebly.com/uploads/1/3/2/8/132814928/zupeluxoludapif.pdfIn PDF document text
    • https://lezexoxutipeb.weebly.com/uploads/1/3/4/4/134462335/fitubifepumaloviju.pdfIn PDF document text
    • http://vewisezozebo.22web.org/widojonixij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417530/normal_5fca70cf2d72f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393785/normal_600fb9b7c3af0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422884/normal_601f1b10eaf25.pdfIn PDF document text
    • https://fusavufotopos.weebly.com/uploads/1/3/4/6/134634064/3832613.pdfIn PDF document text
    • http://subumobo.22web.org/business_process_automation.pdfIn PDF document text
    • https://munopufunorari.weebly.com/uploads/1/3/4/8/134881547/wiwewejonu-wadubozitapox-bivobonuvevibi-xekoda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419437/normal_6012b1bdbceef.pdfIn PDF document text
    • https://zunexoxefa.weebly.com/uploads/1/3/5/3/135340588/6671585.pdfIn PDF document text
    • http://zarepawofeli.22web.org/blackberry_z3_os_autoloader.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gazisemodab.epizy.com/capacitores_resumo.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/fireworks_animated_powerpoint_template.pdfIn PDF document text
    • http://fididebezewigex.epizy.com/fivepulis.pdfIn PDF document text
    • http://zusobowes.rf.gd/gewibosolaxatenalozo.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/clinical_coding_interview_questions_and_answers.pdfIn PDF document text
    • http://nasezerusutupe.rf.gd/norton_antivirus_android.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/atp_world_tour_finals_format.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_off00014e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E7B 5480 bytes
SHA-256: 12cbe21c832068e9cdd18fee2cf7eece5659fe963783688efc1d14605078bb94
font_01_sfnt_off0001615c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1615C 11344 bytes
SHA-256: ff29774e493b7e38369ae687387569edce938d98dc3975c2b6eab47bb62363cf

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