Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19f4fb367f272b0…

MALICIOUS

PDF

72.1 KB Created: 2021-02-11 00:08:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 18c21e8ede62b21b7ea587051bf82eee SHA-1: 741123581ddc6be10bed682494b98aac331f5ae4 SHA-256: e19f4fb367f272b08c446999047d12052e426eeee471ad165c9e7798540379c8
96 Risk Score

Malware Insights

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

The file is identified as malicious by a ClamAV detection and an ML classifier. It contains an embedded URI pointing to 'https://jacksth.ru/wb?keyword=place%20prepositions%20worksheet%20pdf', suggesting a phishing or malware delivery attempt disguised as a worksheet. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically. No scripts were extracted, but the presence of external URIs and the malicious verdict strongly suggest an intent to redirect the user to a harmful resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wb?keyword=place%20prepositions%20worksheet%20pdf PDF link annotation
    • http://flymoney.net/financial_institutions_management_9th_editionj5jqn.pdfIn PDF document text
    • https://cdn.sqhk.co/susojareb/IbvoicP/46043244406.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/jeNifCz/14754108093.pdfIn PDF document text
    • https://cdn.sqhk.co/definuseju/2bRhhif/pajuwovam.pdfIn PDF document text
    • http://disconto50.info/gofawofogu5jml0.pdfIn PDF document text
    • http://kompledom.com/gitazujasobelipuaxkz.pdfIn PDF document text
    • https://cdn.sqhk.co/nixivezez/pPjEid8/xexow.pdfIn PDF document text
    • https://cdn.sqhk.co/tifapoxur/jaNXggl/driveon._net_nyropsgade_6_1602_kobenhavn_v.pdfIn PDF document text
    • http://ruszaimclub.ru/gujopofukolobuxizadju5h8.pdfIn PDF document text
    • https://cdn.sqhk.co/fugolamudara/Cgg0idW/paypal_credit_score_requirements.pdfIn PDF document text
    • https://cdn.sqhk.co/bubarozotuj/ZgezgjG/rugby_league_table_1990.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/simujix/seleccion_artificial_definicion.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/acer_aspire_5733_drivers.pdfIn PDF document text
    • http://pivutabomenatam.rf.gd/vuronibanelixilaxowoxofaf.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/definition_of_coalition_formation.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/90581130106.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_off0000df06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF06 5400 bytes
SHA-256: 19e5036f8d49ab16dc6baac049ea1ace2e6af50a40c31756891b0f56ef959e44
font_01_sfnt_off0000f16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 10044 bytes
SHA-256: 21fa04352bf3f554a883aaab66098732c77b4f64941a9562f97483b6a27fb540

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