Malicious PDF — malware analysis report

Static analysis result for SHA-256 923720f88a3cba0b…

MALICIOUS

PDF

72.2 KB Created: 2021-03-10 18:49:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: dba1fa1bf94fddc58336baa3b6b41f0e SHA-1: e68a47d6315ce70ea2ad135d150197306593a4d4 SHA-256: 923720f88a3cba0bb053bb0ce1fdb7e9c5acd3c2767686df32f3f9aa69863a45
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, suggesting it is part of an SEO spam or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs point to potentially malicious or spam-related content, and the document body, though heavily obfuscated, suggests a lure related to educational materials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://soxebez.ru/wix?keyword=naming+alcohols+worksheet+with+answers+doc PDF link annotation
    • http://promoocaoameericanas.com/behold_a_pale_horsedz21c.pdfIn PDF document text
    • https://sanufelileme.weebly.com/uploads/1/3/0/7/130775971/9fb743a854a2.pdfIn PDF document text
    • https://kaxamibixifuwiv.weebly.com/uploads/1/3/1/4/131452941/a330d527352e7.pdfIn PDF document text
    • http://berkeciftci.net/pink_panther_easy_piano_chords2ovr1.pdfIn PDF document text
    • http://minesaxofunawi.getenjoyment.net/what_does_genesis_chapter_6_mean.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/how_to_add_paypal_button_to_wix.pdfIn PDF document text
    • http://mebelrostov.ru/el_caballero_dela_armadura_oxidada_capitulo_1_resumen_cortorbxd8.pdfIn PDF document text
    • http://luminar4-download.xyz/what_does_the_constitution_say_about_public_health_emergenciesub0wf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e212579a-9186-4c40-b82f-d2816a46e5b4/la_biblia_fue_escrita_en_hebreo_arameo_y_griego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/722b3a10-6f88-49d7-ad2f-709f2f7ad4d4/how_to_read_star_charts_aviation.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/how_much_are_lash_extension_courses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15262489-91a2-4adc-9c87-7de1fd43cd1b/the_childrens_hour_poem_by_henry_wadsworth_longfellow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7e63251-9fcf-4fad-a6e2-e79bc465f86d/the_gray_wolf_throne_summary.pdfIn PDF document text
    • http://zepizevut.atwebpages.com/is_hp_envy_4520_compatible_with_chromebook.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/brookfield_primary_school_preston_uniform.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bab35d4a-6301-43f4-8ac1-a24190a41c24/technical_analysis_for_options_trading.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a560769-82ac-4a52-bafa-a3441bae024f/jiminepuwomebezurenokus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bb84ca6-7db0-4a97-ba72-28f498cf5b49/vovola.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/windwalker_monk_talent_guide.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_off0000dde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE8 5476 bytes
SHA-256: 87ef1e532ce1d535401999aeafa34fb04636425e587df2120916996f42e88698
font_01_sfnt_off0000f071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF071 10296 bytes
SHA-256: 5334fa3233e3db4bc55fc0a1cd6e2f3136e79fd86d66e2b48d245db3e375b707