Malicious PDF — malware analysis report

Static analysis result for SHA-256 13269b6c34c6dc31…

MALICIOUS

PDF

75.3 KB Created: 2021-03-22 15:10:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c06943316b76a92b16ff871993b00cac SHA-1: 1991e5346a17d122a771afbf8058c5c3062ddb53 SHA-256: 13269b6c34c6dc310d96a730ba2957ec9941805ef545aa6ba8803c8964a4a595
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains numerous external URIs, with one prominent URL pointing to a link farm hosted on disposable infrastructure, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and URI findings strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/123?utm_term=chum+chum+chanana+baje+maiya+song PDF link annotation
    • http://resugigujo.iblogger.org/microbial_contamination_of_well_water.pdfIn PDF document text
    • https://kajubogoxin.weebly.com/uploads/1/3/0/9/130969430/nexonamete-kigazofi-bamapagegewaz.pdfIn PDF document text
    • http://kuzojud.66ghz.com/21592061734.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414514/normal_6016c17621dd8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417429/normal_5ff997450670a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387706/normal_5ffaa140c6721.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468540/normal_603fb160438a4.pdfIn PDF document text
    • https://zobagitolofoxaz.weebly.com/uploads/1/3/0/7/130739917/xelobifugup.pdfIn PDF document text
    • http://rumukisizupew.iblogger.org/armando_hoyos_descargar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jiviwuruxaboku.epizy.com/sign_candidate_declaration_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3d11552-15ab-476e-a98f-e2bc9a2b0892/devimifijetu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a323b0f7-1480-4a8e-baed-cf4fcca8f946/oracle_database_administrator_jobs_in_pune.pdfIn PDF document text
    • http://jedasajel.epizy.com/vivoxeped.pdfIn PDF document text
    • http://renawexit.epizy.com/samsung_wf220anw_xaa_manual.pdfIn PDF document text
    • http://ketejaz.epizy.com/solar_eclipse_and_lunar_eclipse.pdfIn PDF document text
    • http://lezenexujurab.epizy.com/column_chromatography_lab_report_example.pdfIn PDF document text
    • http://zakutipatijike.rf.gd/estimating_worksheets_3rd_grade.pdfIn PDF document text
    • http://fijazatomowov.epizy.com/fekixosunadijotewene.pdfIn PDF document text
    • http://mugosovexu.epizy.com/esv_systematic_theology_study_bible.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_off0000e9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DE 5308 bytes
SHA-256: 877346cb2e72cb7b803bcb6da1fb76cf19af4b686b2df47aa15c548418dabbd8
font_01_sfnt_off0000fbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD4 10996 bytes
SHA-256: ef3b3208c7cdad97ebb3fab8e35e3b71242b7c219c76c92da91c216608ed2589

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