Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d96e54de675e0e7…

MALICIOUS

PDF

73.8 KB Created: 2021-05-19 21:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25bdffe80424899aa56a5523930a4d51 SHA-1: 26b25aaa2f39763e1b56081863079c5c8a82999f SHA-256: 3d96e54de675e0e7b56ea10f4dbde99b27cb382f6c40df79da977655593edcb8
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used to host phishing content or redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/strik?utm_term=disney+medley+free+piano+sheet+music+pdf
    • https://fawirato.weebly.com/uploads/1/3/5/3/135392883/8845881.pdf
    • https://tewazaxapij.weebly.com/uploads/1/3/4/8/134873756/bironubebetibe.pdf
    • https://jefabulovonaju.weebly.com/uploads/1/3/1/4/131438419/jigaratukopedo.pdf
    • https://mejebogisoxofix.weebly.com/uploads/1/3/4/6/134606558/mesakezuneb.pdf
    • https://static.s123-cdn-static.com/uploads/4380383/normal_5fc7cee1b4186.pdf
    • https://static.s123-cdn-static.com/uploads/4444877/normal_5fcce0808d4c3.pdf
    • https://zalivibutadugaf.weebly.com/uploads/1/3/5/3/135391941/vorisalinum_fokoxu.pdf
    • https://wizugelavuri.weebly.com/uploads/1/3/5/3/135325487/wowelol_kexitafi_badexupelewisiv.pdf
    • https://duwafozadujazak.weebly.com/uploads/1/3/1/3/131380008/zedaja-lodava-tokisopog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/baxadelefofibuz/befepewukifogasuzirene.pdf
    • https://s3.amazonaws.com/redegelesibif/whiplash_drum_sheet_music.pdf
    • https://s3.amazonaws.com/defujo/measuring_length_worksheets_grade_5.pdf
    • https://s3.amazonaws.com/bojafazes/what_does_a_rag_doll_represent.pdf
    • https://s3.amazonaws.com/popilo/modernist_cuisine_at_home_download.pdf
    • https://s3.amazonaws.com/vutame/49343130525.pdf
    • https://s3.amazonaws.com/vekodupiwarobi/vertigo_exercises_epley_maneuver.pdf
    • https://s3.amazonaws.com/rodigapigeta/32900555551.pdf
    • https://s3.amazonaws.com/bededuxotulapil/harry_potter_y_la_camara_secreta_audiolibro.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e19a.bin
33c4193b14a18a59fb8da7676e66631d127c5d6a286c17764b9b93c2a12b3b45		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE19A 5496 bytes
font_01_sfnt_off0000f42d.bin
e25c23676780f5fa3c48140c367b2dbe95e11d24ebddf71a03dd4b373b604210		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF42D 11112 bytes

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