Malicious PDF — malware analysis report

Static analysis result for SHA-256 4684d51788ed7c3c…

MALICIOUS

PDF

91.5 KB Created: 2021-03-17 21:17:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e7e2ace123235109538e19756938b79 SHA-1: b379feb88977f50f1f84076399d7229306f347e0 SHA-256: 4684d51788ed7c3cc27b7ce4c872b4f722cb685ffbb9521980cb41b6f7537bce
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, and ClamAV detection confirms its malicious nature. The ML classifier also flagged it with high confidence. The document body, though heavily obfuscated, suggests a lure related to educational content ('classifying organisms worksheet 6th grade') to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/wix?keyword=classifying+organisms+worksheet+6th+grade
    • http://creditscorehelp.info/dirt_farmer_all_quest_guideqpfcw.pdf
    • http://glasshookahcatering.com/46549294381kyegx.pdf
    • http://soldonlakewood.com/schlage_electronic_lock_reviewsg2xo4.pdf
    • https://cdn-cms.f-static.net/uploads/4446147/normal_5fd7a8ba1bf2c.pdf
    • http://nncucuucuc.space/sword_art_online_alicization_ending40gln.pdf
    • https://cdn-cms.f-static.net/uploads/4383922/normal_602ec835c38b4.pdf
    • https://cdn-cms.f-static.net/uploads/4406228/normal_600ae225ea809.pdf
    • http://raisinsapp.pro/404271116270h5cd.pdf
    • https://cdn-cms.f-static.net/uploads/4369508/normal_5feaeee90a1a1.pdf
    • http://nonretloli.site/41586533131rej9o.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/babetafaperaxov/ginnie_mae_loan_guidelines.pdf
    • https://s3.amazonaws.com/pafiganovavi/75258475502.pdf
    • https://s3.amazonaws.com/palikuvexake/data_analysis_tools_excel.pdf
    • https://s3.amazonaws.com/mekonulegipero/action_plan_for_school.pdf
    • https://s3.amazonaws.com/zubata/goldstone_infratech_annual_report.pdf
    • https://s3.amazonaws.com/woxorojero/6690477175.pdf
    • https://s3.amazonaws.com/gowebabuxogiro/organizational_structure_examples_essay.pdf
    • https://s3.amazonaws.com/risisipajole/ford_performance_parts_canada.pdf
    • https://s3.amazonaws.com/gomaxod/pololu_a4988_datasheet.pdf
    • https://s3.amazonaws.com/baxunaf/html_tag_text_center.pdf
    • https://s3.amazonaws.com/jewizopukuni/dbt_skills_worksheets_linehan.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011bd8.bin
436c995b205946f8dd57fa82b8e87becefc429e624a37c2daf93b9fc68c24a4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD8 5544 bytes
font_01_sfnt_off00012ea0.bin
4ea8ad4978e8c0a89edff09d442f6d4f5d755431b3954168d12c64c8463223a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA0 10400 bytes
font_02_sfnt_off00015253.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
pdf-font-stream PDF embedded font (sfnt) at offset 0x15253 4324 bytes