Malicious PDF — malware analysis report

Static analysis result for SHA-256 241db8021f07bf3e…

MALICIOUS

PDF

79.6 KB Created: 2021-03-08 19:43:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d709b3f4f1595e1adaf5b556e373b8ce SHA-1: 22e7eea9bfc2b086ef976f39722f85075fe4141d SHA-256: 241db8021f07bf3e233c20f3b0a0533941960968302070e886704e5be432af8d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and redirectors, indicating a link farm designed to obscure the final malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are characteristic of phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://leonvi.ru/strik?utm_term=physics+ncert+answers+class+9 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456666/normal_604370984d7a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426060/normal_5ffeb4cd1bcf7.pdfIn PDF document text
    • http://xuvaxujogilo.mygamesonline.org/pababa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458394/normal_6003fc4378bc0.pdfIn PDF document text
    • https://cdn.sqhk.co/wofikubid/Cf80jhH/xafepozamesawuvuxovaju.pdfIn PDF document text
    • http://topukovatawosu.sportsontheweb.net/tilidutedalaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366358/normal_60177980e13e4.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/BBjipnM/military_guns_simulator_war_battlefield_gun_games.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://mawokale.myartsonline.com/french_english_dictionary_book_app.pdfIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_d9c85157b9dd49049f2030ae23ec43af.pdf?index=trueIn PDF document text
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_8e90a66b693347288baace0645657c24.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/adc75e07-a3c3-4b79-9105-d30f1d766c5b/aswb_clinical_exam_study_guide_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a35958d-0d64-4847-8f7a-55f24a212f06/ping_pong_workshop_london.pdfIn PDF document text
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_5e09b66f88ca4701940f843df2f64080.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/91bd87e9-032a-4d14-abc9-b9774b662e5b/mebikusadefozanevime.pdfIn PDF document text
    • https://1801fa0f-56e4-4894-8452-b8e06651d4be.filesusr.com/ugd/868401_38024ba829294d3aa8cd897d9ead2d7a.pdf?index=trueIn PDF document text
    • http://jalijoruki.atwebpages.com/how_many_carbs_in_burger_king_medium_onion_rings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/989272c5-00c7-498d-8c66-7a98e95e61bb/que_es_un_mapa_de_riesgos_laborales.pdfIn PDF document text
    • https://170d08c7-2527-4f8e-8bc4-cf7f6ffab704.filesusr.com/ugd/afe24e_7355251cf9e646c3b999cf9f2bceba49.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED09 4916 bytes
SHA-256: 89c4d2c8da24bd555d54caf54ac40e686a2830cce0c86637fc45c7b2b0a0c833
font_01_sfnt_off0000fda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA8 10940 bytes
SHA-256: e2c72a5492310bed35423c79c2c8f699e2e499cbe167c678cdda83722d774519
font_02_sfnt_off000122ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122ED 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230