Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f7e2b27cfb992b4…

MALICIOUS

PDF

73.6 KB Created: 2021-05-23 13:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4c55f97e2d56f10f22b657ed84d66748 SHA-1: 3e259e07e804540e0d9595ec192c59e0271a0b0a SHA-256: 5f7e2b27cfb992b485eaae5a7b398b7aeed37ccb282360ebcda8492f321b2a7c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, suggesting a link farm or phishing attempt. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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://druttle.ru/strik?utm_term=algebra+1+block+inequalities+word+problem+worksheet PDF link annotation
    • https://movakesomerinid.weebly.com/uploads/1/3/4/5/134528648/6138780.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478402/normal_6017229fd2401.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468820/normal_5ff11d45d2a28.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469641/normal_5fe26dffe92bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448550/normal_600b117ce9c5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366660/normal_6046e76d6d914.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390641/normal_5fd7cf1accd64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424009/normal_5fe4fbe8de343.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486965/normal_601f107a24fce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416332/normal_605189d84562d.pdfIn PDF document text
    • https://nopeludaseji.weebly.com/uploads/1/3/3/9/133986928/minule.pdfIn PDF document text
    • https://gupijevud.weebly.com/uploads/1/3/1/4/131407369/6314961.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_60259f77e87ec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/what_is_meant_by_sociological_imagination.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/tuguxuxosedomaxoder.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/the_trials_of_apollo_the_tyrants_tomb_audiobook_free.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/75231460343.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/cae_reading_exam.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/akuh_radiology_reports_online.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/setan.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/kabizujufewupepuxej.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/carrom_pool_apk_uptodown.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/franz_liszt_consolation_no_2_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/grade_2_science_worksheets_rocks.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_off0000e323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE323 5948 bytes
SHA-256: 2cfe7636c1c15f3f70d0808dc64ffbc1ed6a5e139d50440df3f4a48720603107
font_01_sfnt_off0000f74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74A 9820 bytes
SHA-256: 5dc15a7665a6570ed0584a6fd24759f1880b0b6b8c4e0b78f32324628ff632e3

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