Malicious PDF — malware analysis report

Static analysis result for SHA-256 f01b3c4a2d6d1247…

MALICIOUS

PDF

78.4 KB Created: 2021-05-13 05:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: a16b961c4ab7f1906092333b346ab5e5 SHA-1: df7a0ece54164507d33ecf9a09df1c4ff752042d SHA-256: f01b3c4a2d6d12472e571094cd8c10e744ed8fb5a203a78243bc2893ce759644
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents hosted on different domains. One of these links, 'https://seumenha.ru/strik?utm_term=how+to+analyze+exit+interview+data', is flagged as potentially malicious. The ML classifier and ClamAV also indicate maliciousness, suggesting the document is part of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://seumenha.ru/strik?utm_term=how+to+analyze+exit+interview+data PDF link annotation
    • https://cdn.sqhk.co/kigoxeni/gh5xhjk/40302242644.pdfIn PDF document text
    • https://nedugapepo.weebly.com/uploads/1/3/4/2/134265444/5446109.pdfIn PDF document text
    • https://cdn.sqhk.co/lerutefo/yjcEig6/pianistas_famosos_actuales_mexicanos.pdfIn PDF document text
    • https://mofagobebaz.weebly.com/uploads/1/3/4/6/134633285/b34ff1.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobuwaxegu/hjdBjjM/kekinoke.pdfIn PDF document text
    • http://lenuboza.iblogger.org/los_caballeros_de_la_mesa_redonda_libro.pdfIn PDF document text
    • https://cdn.sqhk.co/wixadigizal/ZxgcjiK/big_ideas_math_blue_answers_10._7.pdfIn PDF document text
    • https://cdn.sqhk.co/definuseju/2TKHf05/best_buy_nyc_jobs.pdfIn PDF document text
    • https://sipedevesebin.weebly.com/uploads/1/3/4/8/134879103/d6918b.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/xukirizugukugi/6478714755.pdfIn PDF document text
    • http://xewojof.rf.gd/opera_passwrter_auslesen_android.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/kolobi.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/warituwanazuvegekapilu.pdfIn PDF document text
    • http://xexelakufakeze.epizy.com/wutopawak.pdfIn PDF document text
    • https://s3.amazonaws.com/kotidox/fupowux.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/jack_reacher_tv_series_trailer.pdfIn PDF document text
    • http://lulanojejol.epizy.com/4th_grade_math_brain_teasers_worksheets.pdfIn PDF document text
    • http://foxebunuref.epizy.com/grand_canyon_north_rim_trail_guide.pdfIn PDF document text
    • http://vabizofolimise.epizy.com/bmw_x3_2011_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/tamil_movie_whatsapp_status_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/34533898006.pdfIn PDF document text
    • http://kesaratesur.epizy.com/unintended_consequences_eminent_domain_viewing_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/cuales_son_las_propiedades_de_la_potenciacion_ejemplos.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_off0000f5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B4 4972 bytes
SHA-256: 8d2a7761163d91cb16ca17712874ba377bb8e1dbac154d404195f5fedb20f3f0
font_01_sfnt_off000106d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D1 10408 bytes
SHA-256: 0681c60dc207a8d020eec4a61d7421b84509fba187b7bda89c0edb80d4bea70d

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