Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ed1eff9c8b8954…

MALICIOUS

PDF

79.1 KB Created: 2021-04-02 04:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d153aac1986fa8d548ada295fc86b74f SHA-1: 9d14ccc7fd6a000283d19d302ff37e863e09f493 SHA-256: a1ed1eff9c8b895481c6d60d0adc3ad9afb1d236a3e3213490678ce66299c2cb
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The document contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an effort to obscure the ultimate destination of the malicious links. The presence of embedded URLs and the nature of the heuristics strongly suggest the file's purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=death+star+pumpkin+stencil PDF link annotation
    • https://cdn.sqhk.co/mazonixun/igjhYhi/melivejigaluganorozibe.pdfIn PDF document text
    • https://cdn.sqhk.co/kokedipemi/egihdhd/20823398702.pdfIn PDF document text
    • http://kikebumanexewuj.22web.org/yugioh_card_guide_legendary_collection_kaiba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380213/normal_5fdfc93974cf3.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvurero/jdhiygf/24866027614.pdfIn PDF document text
    • http://pulemovidake.22web.org/basic_croquis_template.pdfIn PDF document text
    • http://masotobu.iblogger.org/67044892446.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370088/normal_600ecab527660.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470968/normal_5ff3ab89dfee1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402247/normal_6064d11f32997.pdfIn PDF document text
    • http://kagogumo.iblogger.org/introduction_to_thermal_and_fluids_engineering_solutions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369187/normal_601f7e40e1c22.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://deseruti.rf.gd/epoc_causas_sintomas_y_tratamiento.pdfIn PDF document text
    • http://terofiwewu.rf.gd/aim_full_form_in_exam.pdfIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_432a163c09b74536b91ac5ef739f0ceb.pdf?index=trueIn PDF document text
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_7e31f54b0c8045c1936647ed07faf714.pdf?index=trueIn PDF document text
    • http://xivutunitilema.epizy.com/beiimaan_love_songs_320kbps.pdfIn PDF document text
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_9291001bdc6440a5a4732ab056ea7406.pdf?index=trueIn PDF document text
    • https://0ea28b16-58c2-472d-b6be-3e97fe9b7bb6.filesusr.com/ugd/696b8a_8e6c343f233746e483d303ff02d7b0d4.pdf?index=trueIn PDF document text
    • http://jilawovo.epizy.com/donukili.pdfIn PDF document text
    • https://0778d94d-b67d-49c3-8f6f-43f52d6edec9.filesusr.com/ugd/b85eb0_305c06d4d4db45cf8841d9125a1426e7.pdf?index=trueIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_b92883096c9a4f74ad173961c92f85f8.pdf?index=trueIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_f40e1031854e4be983bdc6439ae1be46.pdf?index=trueIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_c357fe63066a493787f7d77770f64936.pdf?index=trueIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_a47fd69c4baa45cc923c90c671e82c41.pdf?index=trueIn 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_off0000eba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA7 5008 bytes
SHA-256: 17aa21fb56a581523e699f16e508a20f5dcef60898bc34839828c558093d45dc
font_01_sfnt_off0000fc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC83 10608 bytes
SHA-256: 918fee716d38af665fe11d211125c1a09edbb222effa5e83f7e2e703899d6352
font_02_sfnt_off000120e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E3 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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