Malicious PDF — malware analysis report

Static analysis result for SHA-256 9311344cbf1ae1e3…

MALICIOUS

PDF

75.8 KB Created: 2021-03-04 18:52:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 0d245a2c520e151aeb51448fedbc13f8 SHA-1: 2aa10e1ec7b682271e7e4c028fad2e83bf047259 SHA-256: 9311344cbf1ae1e37ce5c32334e530eddf3fa0ea7346d9c6069ded046bed3c1f
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely directing users to malicious sites. The embedded URL 'https://mezovuduw.ru/strik?utm_term=what+makes+sydney+unique' is a primary indicator of this malicious redirection.

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=what+makes+sydney+unique PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403679/normal_6024159a203d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460723/normal_5ff64b09509a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366340/normal_60250e71e7e8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374522/normal_603156c7ab447.pdfIn PDF document text
    • http://golosa-spasibo.ru/download_murottal_juz_30_imam_sudais7l2xf.pdfIn PDF document text
    • https://vakenufepuxino.weebly.com/uploads/1/3/4/5/134529081/zexipe-jirojom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391893/normal_5fd0847707097.pdfIn PDF document text
    • https://pagudibaxite.weebly.com/uploads/1/3/1/4/131410234/wofuwizakezogido.pdfIn PDF document text
    • http://mmamba.ru/ocean_currents_map_worksheet_answersdapud.pdfIn PDF document text
    • https://tulapubilogu.weebly.com/uploads/1/3/4/8/134881906/0475751d7a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384821/normal_5feb831bd23b3.pdfIn PDF document text
    • http://nonowun.mywebcommunity.org/denasanipakibe.pdfIn PDF document text
    • http://discount50.pro/137857778536bmjz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389358/normal_5fe2e216ef50f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lugenizuridaj.atwebpages.com/how_to_determine_if_a_hypothesis_is_one_tailed_or_two_tailed.pdfIn PDF document text
    • http://roveramo.atwebpages.com/bobolituxi.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/bohemian_rhapsody_satb_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/dell_optiplex_9020_mt_ram_upgrade.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/physical_science_grade_11_deped.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_off0000ea27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA27 5244 bytes
SHA-256: 577c042827dd0012e49690c294a44518c4ae7cd11b29c3a8d29ca91ad0e20846
font_01_sfnt_off0000fbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE6 11572 bytes
SHA-256: 3cb5243c6888cbd5b84141710a13f323384f3f8b18b07338487ca42be7a22048

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