Malicious PDF — malware analysis report

Static analysis result for SHA-256 b216f24ca602df8f…

MALICIOUS

PDF

79.6 KB Created: 2021-02-18 17:02:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7edff2080890882dda198bf77637349d SHA-1: 23b95b2c8f12c1bdc08cf0b86081dd232fc3525e SHA-256: b216f24ca602df8ff8199a07bfedc8ce59432132cb34da81b6cbc35cc49512fe
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/strik?utm_term=what+word+means+held+captive PDF link annotation
    • https://nopubogap.weebly.com/uploads/1/3/4/6/134667077/vejufad-vaxowoven-jexot.pdfIn PDF document text
    • https://cdn.sqhk.co/lunapolakezo/hblDf4j/67586275771.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/chjsVlG/robot_hero_transform_shooting_game_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/dijowasedop/l5SgeuI/save_the_planet_vans_high_tops.pdfIn PDF document text
    • https://pakotoroxup.weebly.com/uploads/1/3/0/8/130815058/zirexo_dororawageb_ropidelotomun_jufewakexizepe.pdfIn PDF document text
    • https://cdn.sqhk.co/dolubivo/6wjnJge/ripufibutatimekut.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxokakijefe/hIQgeid/lizodozebezituderemeno.pdfIn PDF document text
    • https://komanogorolelew.weebly.com/uploads/1/3/1/3/131380356/8423347.pdfIn PDF document text
    • http://xobaxibudizoba.22web.org/pdf_agama_kristen_kelas_12.pdfIn PDF document text
    • https://cdn.sqhk.co/gigijuke/hifjggh/firiwuselebexu.pdfIn PDF document text
    • https://cdn.sqhk.co/roziguze/Oyha8gi/king_herod_agrippa_in_the_bible.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/8gZbhcw/fenapesidomitixegifozo.pdfIn PDF document text
    • https://cdn.sqhk.co/tefupudoma/WRzGrij/warship_legend_idle_captain_redeem_code.pdfIn PDF document text
    • https://cdn.sqhk.co/wadalibituge/hjNegeu/85993346313.pdfIn PDF document text
    • https://cdn.sqhk.co/dosojegomugu/es2JrMg/69566734898.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/fosagoba/handwriting_worksheets_cursive_name.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/foxosijugegipidimibow.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/south_coast_fishing_report_2019.pdfIn PDF document text
    • http://pepezuvizomu.rf.gd/cooking_merit_badge_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/mewanalasakevemopadiba.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_off0000fb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0E 5476 bytes
SHA-256: 003645d84e4d4d1a949b4ee5d4ee821af59b6eaad09eda12baa03f26400bf749
font_01_sfnt_off00010da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA0 10440 bytes
SHA-256: d329ce8a8d8c1a5e682b4d10c9b42e4c19bc2e99f8588f34d5d7545354c1137f

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