Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a13b877d1d6c1fa…

MALICIOUS

PDF

77.7 KB Created: 2021-03-02 00:21:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ad52532d55f1dff9612e902ccaaa586b SHA-1: 7e3d967b9c9ada3d7594cded2e96ee06007b4d81 SHA-256: 2a13b877d1d6c1fa41c7092d8ebee58e220a16f4f27dbad54978ee96978f4d67
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm for SEO manipulation or phishing. The presence of a 'download' button lure and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate malicious intent. The ML classifier output of 0.999740 further supports this assessment, pointing towards the distribution of malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://midufefew.ru/strik?utm_term=driver+hp+photosmart+c5280+all-in-one+mac PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483336/normal_5fd93e1b4b4e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453344/normal_5fc773744f1d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500429/normal_60338b877977d.pdfIn PDF document text
    • https://zefijevizo.weebly.com/uploads/1/3/2/3/132302816/javajexonuzotunodep.pdfIn PDF document text
    • https://gomosonu.weebly.com/uploads/1/3/2/7/132712120/zorufaziwa_jajudukil_novug_rowid.pdfIn PDF document text
    • http://goodnaturak.space/84125297226nk76y.pdfIn PDF document text
    • http://teachersaid.fun/project_cost_analysis_template_in_excelfy3kv.pdfIn PDF document text
    • https://kaposabebozof.weebly.com/uploads/1/3/4/4/134466843/2691350f9e64.pdfIn PDF document text
    • http://fruct.space/worgen_druid_colors2cygp.pdfIn PDF document text
    • http://eurostore.info/venn_diagram_template_with_linessqvmi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407983/normal_600b272e46207.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450345/normal_5fc92056a1918.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379854/normal_5fcda1177cf0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379045/normal_5fdc670a6c886.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://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_off0000e1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E5 5644 bytes
SHA-256: b7c1b4190af6287dca67c5767e2551f19ca3c9faa65071c4040c485078b503c8
font_01_sfnt_off0000f4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F9 10832 bytes
SHA-256: 08aaa9a15da412b20d7c4acc04eb85d317831a92ce62690bc1d2645703bb3404
font_02_sfnt_off00011989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11989 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

Open this report in the interactive analyzer, or submit your own file for analysis.