Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8d9eb430e7ca16…

MALICIOUS

PDF

74.1 KB Created: 2021-05-13 10:40:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: c78fb87895e0ca0026cccd423daee4b0 SHA-1: 9de2db3ab9a0eda991b88396eaa6ca1fbac607f1 SHA-256: ec8d9eb430e7ca16ed5954d24dac3713b405e8a61e209c3959131242eca88f0d
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs, with one prominent URL being `https://mezovuduw.ru/strik?utm_term=sample+gm+diet+day+2+plan`, suggesting a phishing or malware distribution attempt. The document body, though truncated, hints at a 'diet plan' lure, aligning with common social engineering tactics.

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://mezovuduw.ru/strik?utm_term=sample+gm+diet+day+2+plan PDF link annotation
    • http://tonukavugu.mygamesonline.org/97085238367.pdfIn PDF document text
    • https://cdn.sqhk.co/jajotulix/WhfIjbY/sporosarcina_pasteurii_dsm_3300.pdfIn PDF document text
    • http://mufawajidoxe.22web.org/36504191753.pdfIn PDF document text
    • https://cdn.sqhk.co/rifasidajika/Nhajehc/barbarian_5e_guide.pdfIn PDF document text
    • http://dewisazovuvoxi.mywebcommunity.org/filipino_dictionary.pdfIn PDF document text
    • http://kafawen.22web.org/40750402707.pdfIn PDF document text
    • https://cdn.sqhk.co/bowewulaxam/jiugfLn/70806756914.pdfIn PDF document text
    • http://nesibobivugo.iblogger.org/analisis_capitulo_3_la_charca.pdfIn PDF document text
    • http://venameripuna.22web.org/weber_grill_parts_griddle.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://reditavipesef.rf.gd/media_player_windows_free.pdfIn PDF document text
    • http://jobifizokugo.rf.gd/degomasukiketodo.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/mississippi_driver_s_license_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/72028597983.pdfIn PDF document text
    • http://nifukugobu.rf.gd/championship_manager_93-_94_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/tuwesokupogakigos.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/54315465642.pdfIn PDF document text
    • http://pozifaganepele.epizy.com/anatomy_of_flowering_plants_class_11_notes_download.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_off0000e576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE576 5344 bytes
SHA-256: d2d90bba49c79b9e92fb997c2044cf82776e5dca3cf76d37f4bbb53d12a737e1
font_01_sfnt_off0000f79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79C 10588 bytes
SHA-256: 0cb3acd88e7b5b93904819b34de630a0875b1db7607bae94e04e139babd1f11c

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