Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b8cc24a06da0b0a…

MALICIOUS

PDF

95.7 KB Created: 2021-05-18 00:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 16cac1846d8990c485dfa5eca0b2084c SHA-1: 9c90eecea0596f743c5c98a9b548e0fea0a091e3 SHA-256: 7b8cc24a06da0b0a2e4826615dfcd6965072324a04874b2257b9d58fef59ea50
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://dafemum.ru/strik?utm_term=calendario+anual+2020+para+imprimir+pdf PDF link annotation
    • https://bajiwemijowulu.weebly.com/uploads/1/3/5/9/135990815/af9330c61ba9e3.pdfIn PDF document text
    • https://jegiwagoxupida.weebly.com/uploads/1/3/1/3/131379361/675471.pdfIn PDF document text
    • https://mudizuponiwox.weebly.com/uploads/1/3/2/7/132740987/5f25721ee.pdfIn PDF document text
    • https://nidozasa.weebly.com/uploads/1/3/4/6/134680612/5ed9beaf4c2d1.pdfIn PDF document text
    • http://retafap.22web.org/the_origins_of_the_modern_world_chapter_6_summary.pdfIn PDF document text
    • https://gipofomodofomew.weebly.com/uploads/1/3/2/3/132303323/majukegabokimile.pdfIn PDF document text
    • http://tivunuvuzamiguj.22web.org/xaroliraxekobodu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pokukalaso.rf.gd/protein_foods_veg_list_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/sevube.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/how_to_create_a_beautiful_wordpress_website_from_scratch.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/carnarvon_gorge_guided_walks.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/reflective_practice_template_physiotherapy.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/53291013217.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/how_to_trade_in_forex_for_beginners.pdfIn PDF document text
    • http://bedekopezedegej.rf.gd/year_1_time_table_worksheets.pdfIn PDF document text
    • http://wonetone.rf.gd/dakojogorupatuba.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/buwesawitenuvuluw.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/nudabobipufumawikajimuru.pdfIn PDF document text
    • http://gobavaduxa.epizy.com/simplicity_vacuum_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/invigilator_interview_questions_and_answers.pdfIn PDF document text
    • http://talusulimatedo.rf.gd/immanuel_kant_aufklrung.pdfIn PDF document text
    • http://vajevus.rf.gd/water_pollution_effects_on_human_health.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/the_girl_who_owned_a_city_characters.pdfIn PDF document text
    • http://pusisokomadebi.rf.gd/zuvisilutetu.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41D 6588 bytes
SHA-256: 24fd6868f187b5667792517f9f69d22ac5a3de5011d4d3824467392effeade79
font_01_sfnt_off00010497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10497 5108 bytes
SHA-256: 241f47d9e8dbcc7a787e4cd21ff2677538d5d34fb38d5dd6bc37460a7d542f1b
font_02_sfnt_off000115cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CC 3524 bytes
SHA-256: ace1c15365a6b766e8c7e0c640fbb37041fd735646ac2671dee71595aad2a1aa
font_03_sfnt_off000122b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B7 12016 bytes
SHA-256: d01767151c6d0db5b6dac85cf30b0ef09c3474bce6892e4bb33814de02968e5e
font_04_sfnt_off0001499f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1499F 16492 bytes
SHA-256: d93c04125a42439e39cac3eb3fa889a97f682fa56b01ba47b8167e4115a1617d
font_05_sfnt_off00015ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FF2 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333