Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f047c8340c92b1…

MALICIOUS

PDF

81.5 KB Created: 2021-04-06 19:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f277c12ba8500b0b3d74c0864fe81720 SHA-1: 584dc54fc519ffcd887213295d66c9ead9c93c30 SHA-256: a8f047c8340c92b1bb3cab587b76789e81d0848196deccea454b13636e0cb998
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous embedded URLs, with the primary malicious URL being https://mezovuduw.ru/strik. The presence of these URLs and the overall detection suggest a phishing attempt disguised as a grant funding letter, likely intended to redirect users to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/strik?utm_term=sample+letter+of+intent+for+grant+funding+pdf PDF link annotation
    • http://evilcheats.fun/gojidawewofov4f6u.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/lubupetufanovakega.pdfIn PDF document text
    • https://kegipulavuraruz.weebly.com/uploads/1/3/1/1/131163865/zidimikukozugif_bejuxubusurapu_bezem_xazixex.pdfIn PDF document text
    • http://lumacy.site/what_is_a_winchester_model_94_worthola3a.pdfIn PDF document text
    • http://logvoz.ru/2997969028483xs7.pdfIn PDF document text
    • https://zesijedoroge.weebly.com/uploads/1/3/4/3/134372038/webiwisi.pdfIn PDF document text
    • https://vujewixijul.weebly.com/uploads/1/3/1/4/131437312/1283160.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://majezomisi.myartsonline.com/zijew.pdfIn PDF document text
    • http://xukulugix.rf.gd/siete_canciones_populares_espaolas.pdfIn PDF document text
    • https://8c805f22-5240-4a8e-9b4d-8499607ff1fc.filesusr.com/ugd/76156b_b82d165eff2f4ba9b0789c616bb274af.pdf?index=trueIn PDF document text
    • http://mexokibalu.epizy.com/fiwitiwaremativuxasu.pdfIn PDF document text
    • http://monudaduxafe.epizy.com/24208588071.pdfIn PDF document text
    • http://nigukeja.epizy.com/2998920575.pdfIn PDF document text
    • http://sidiwen.epizy.com/collapsing_toolbar_with_imageview_android.pdfIn PDF document text
    • http://mologesasik.epizy.com/9231597752.pdfIn PDF document text
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_b7cd16411f854a5587423fbe0c21a476.pdf?index=trueIn PDF document text
    • http://kokutofir.rf.gd/articulate_storyline_portable.pdfIn PDF document text
    • http://sisuraregimu.rf.gd/how_to_use_love_alarm_app_android.pdfIn PDF document text
    • https://995be609-08d3-41b1-a6c0-90e53670bcec.filesusr.com/ugd/9988e1_36de740a64fd4289b58e0fa00f11eb35.pdf?index=trueIn PDF document text
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_e1145dbb222542dd90408209cd34e21e.pdf?index=trueIn PDF document text
    • http://ximogubofew.epizy.com/ansiedad_que_es.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF420 5168 bytes
SHA-256: be2cac60196f552ebec81547157e7fdf9776305dad1abfa44e6f9ab7adaa5ea5
font_01_sfnt_off00010595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10595 10704 bytes
SHA-256: 03eff34999ad48c35179fd129e527b67abd864d724eada38615e7f2600b6674b
font_02_sfnt_off00012a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A26 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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