Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5135b60743355a7…

MALICIOUS

PDF

71.8 KB Created: 2021-03-29 10:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a12ce0ebb3dc279a5b395b5bbe49c23a SHA-1: 431726607cc4cdf19f6b57f0f84f66b35b609d39 SHA-256: d5135b60743355a7a56d5083b34193a4c8e815d02f22dfde15fc935c05cacde7
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 for SEO link farms or to direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URL `https://resalured.ru/award?keyword=cambridge+ket+past+papers+pdf` suggests a lure to trick users into downloading further malicious content or engaging in phishing.

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 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://resalured.ru/award?keyword=cambridge+ket+past+papers+pdf PDF link annotation
    • http://futup.ru/39523388105ygj2j.pdfIn PDF document text
    • https://veborejekeraleb.weebly.com/uploads/1/3/4/4/134480613/dekoginebejiven_mujav_lamopasuxa.pdfIn PDF document text
    • https://jipuzalo.weebly.com/uploads/1/3/4/6/134693454/mivilom.pdfIn PDF document text
    • http://reduslim-shopofficial.site/692865709585yecc.pdfIn PDF document text
    • http://copyright-notice-ig.com/fobetegelomumowadegutsayt3.pdfIn PDF document text
    • https://shop.swiss-exams.ch/produkt-kaIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xopugup/define_positive_attitude_meaning_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/podojabonikig.pdfIn PDF document text
    • http://ralodanuf.rf.gd/modo_de_produccion_esclavista_ventajas_y_desventajas.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/metodologia_dela_investigacion_de_roberto_hernandez_sampieri.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/67919510811.pdfIn PDF document text
    • http://gesuposobevexo.rf.gd/msi_am1i_motherboard_specs.pdfIn PDF document text
    • http://fekobovovexi.epizy.com/ruvubonarukuwevuxafubez.pdfIn PDF document text
    • http://nuxajirurus.epizy.com/87779779488.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/best_ebook_reader_app.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/borland_c_builder_6_enterprise.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/design_a_t_shirt_template_twinkl.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/jiratuvoruteni.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_off0000db21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB21 5436 bytes
SHA-256: 5d5a4fcd91ade48737a2ffd0773e66ed71944106c39b88e2b25fe31791d69746
font_01_sfnt_off0000ed81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED81 10760 bytes
SHA-256: 8353d581fb65565f3c6bfd3e2c3c21f153e0cdf96d4063505758aafe595418f0

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