Malicious PDF — malware analysis report

Static analysis result for SHA-256 2986680d45c2ba91…

MALICIOUS

PDF

71.4 KB Created: 2021-02-27 18:52:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 86e71dac455bae418636144d9b832afb SHA-1: 485f8c39b5e5e73a4a36ef4cc4b2bbf48735dd3a SHA-256: 2986680d45c2ba916aa1c175db0b343a1801fc744b8b6b3cf73d1f898f4eaa3c
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to disposable hosting services, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to external, 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://vilenefex.ru/strik?utm_term=how+to+study+for+biochemistry+exam PDF link annotation
    • https://kikizesojumare.weebly.com/uploads/1/3/4/7/134718780/5904228.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405186/normal_5feb701422bd5.pdfIn PDF document text
    • https://delidanazej.weebly.com/uploads/1/3/2/6/132681463/venigufidofa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421365/normal_603271c31a9ff.pdfIn PDF document text
    • https://pesuzipowezav.weebly.com/uploads/1/3/1/6/131636843/kajajo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393220/normal_603106be5d393.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387929/normal_5fcbcb9ac1a72.pdfIn PDF document text
    • http://durasazi.iblogger.org/puzugamexek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475570/normal_6002711f96e18.pdfIn PDF document text
    • https://wimelavejitovuv.weebly.com/uploads/1/3/4/5/134597731/e8223541c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406241/normal_601a2058aff9b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://karelovaluz.epizy.com/23734353553.pdfIn PDF document text
    • http://femejedad.epizy.com/falasexi.pdfIn PDF document text
    • http://favigagiwu.epizy.com/bitixugugogasefebafisazol.pdfIn PDF document text
    • http://nepowabut.rf.gd/how_to_clean_dyson_vacuum_filter_v11.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_off0000dae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE3 5592 bytes
SHA-256: ce7eff727493df674dec4ee2439bc4fb426a8d034a71f686a32eadae80cbfc1c
font_01_sfnt_off0000edd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD3 10240 bytes
SHA-256: 039782db719e31d8da128f30ee9a125ffbd76e29a7087c0071b8b8597b0299f2

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