Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b51e9e8e24913fc…

MALICIOUS

PDF

79.1 KB Created: 2021-03-11 17:51:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ec7dcf6f3cb4ba9cfae66a7607b2fee9 SHA-1: ce8d2efaf936010d942076388cabd6a8a6a6afbe SHA-256: 4b51e9e8e24913fc892065222d022ebd4cf34b31f99aa78467f7c415d12cd47a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to 'jumiwimov.ru', indicating a likely phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a malicious intent to obscure the true destination. While no scripts were extracted, the presence of external URIs and the ML classifier's high confidence score strongly indicate malicious activity.

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://jumiwimov.ru/award?keyword=disenteria+bacteriana+pediatria+pdf PDF link annotation
    • https://fuxugikitoze.weebly.com/uploads/1/3/1/0/131070560/tekaruze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384154/normal_5fd3aec929b04.pdfIn PDF document text
    • https://xidiziwuzubiwon.weebly.com/uploads/1/3/4/6/134653180/nugajejesuzaz.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/sie5ogj/vepekekemimozoke.pdfIn PDF document text
    • http://mamunetosi.iblogger.org/41579491599.pdfIn PDF document text
    • https://ninukiwipovesot.weebly.com/uploads/1/3/0/9/130969879/3615637.pdfIn PDF document text
    • https://cdn.sqhk.co/zisenusaf/phhia1i/living_wild_island_survival_skills.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389603/normal_6004da08e4c74.pdfIn PDF document text
    • https://nuvaxavixo.weebly.com/uploads/1/3/0/7/130738964/godesorenuwonuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452381/normal_5fcad24e38a33.pdfIn PDF document text
    • http://zujiran.iblogger.org/rslogix_5000_udt_example.pdfIn PDF document text
    • https://cdn.sqhk.co/pavupaken/geOiiAQ/tazigolowarebo.pdfIn PDF document text
    • https://matexofetuboso.weebly.com/uploads/1/3/1/4/131453592/5123193.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
    • https://uploads.strikinglycdn.com/files/a0b48c5a-7c2c-4e99-8a6a-7bbfb41705ce/24569152268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4fa3fc6-95c1-4488-a913-4c7e7bd1ca05/6121446364.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/18843077557.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/riworonulo.pdfIn PDF document text
    • http://pomujip.rf.gd/zerepodiwapebizumisig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64a2960c-ba33-4f66-91b3-2381e024a83b/15170268561.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_off0000ec63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC63 4932 bytes
SHA-256: d519eb5d60b5ea7e7f383f09a5102e8eb9c2bd239b50b9bbacc12c409a5f14bd
font_01_sfnt_off0000fd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD22 10448 bytes
SHA-256: 6f77b9aea20fe0474661c39d7153b9b7e47c9cec151fd938e3192440cfa120ca
font_02_sfnt_off000120e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E1 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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