Malicious PDF — malware analysis report

Static analysis result for SHA-256 4613d77de20f7dd0…

MALICIOUS

PDF

77.1 KB Created: 2021-01-29 05:19:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d8a9e0355532a3aa724ce754b8c39a25 SHA-1: 0dd4ddf2bf99d91adc0b695457616ca57cd94909 SHA-256: 4613d77de20f7dd0f7f57ed426e148c86edf52ec9c74b60fb58aa598497cdcf5
186 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains or use suspicious URL structures, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/wb?keyword=word%20trip%20game PDF link annotation
    • http://kyponnik.online/59757692762awr4z.pdfIn PDF document text
    • https://dimejozetef.weebly.com/uploads/1/3/1/0/131070151/misumixaf.pdfIn PDF document text
    • https://juxibawazorar.weebly.com/uploads/1/3/3/9/133997202/2280177.pdfIn PDF document text
    • http://koprovk.xyz/tadumijotetejazuxudn7gt0.pdfIn PDF document text
    • https://xixuwixopawaf.weebly.com/uploads/1/3/1/3/131380138/619c3bd1dde.pdfIn PDF document text
    • https://cdn.sqhk.co/sevafeluba/jcAjcuU/32044479920.pdfIn PDF document text
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/c6325617401.pdfIn PDF document text
    • https://jajaleregonu.weebly.com/uploads/1/3/4/2/134235513/5ff5f2202.pdfIn PDF document text
    • http://dabutaxezopis.iblogger.org/triangle_exterior_angle_theorem_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/fasaparoba/gcehcij/61032924257.pdfIn PDF document text
    • https://cdn.sqhk.co/fofotixoz/Njdje7z/tovezifulenadumaxilofa.pdfIn PDF document text
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/9458640.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/578070.pdfIn PDF document text
    • https://cdn.sqhk.co/wixakulu/MjaNihO/baby_growth_chart_boy_percentile_calculator.pdfIn PDF document text
    • https://cdn.sqhk.co/sasibasodiwu/ijbxbih/fake_tattoo_editor_online.pdfIn PDF document text
    • http://my-favshopf.online/slay_the_spire_seedsfunxy.pdfIn PDF document text
    • http://azorocheat1.xyz/xiworafetugukozezogitufufma62i.pdfIn PDF document text
    • https://vipukawolatu.weebly.com/uploads/1/3/4/4/134486161/05780821b81c8.pdfIn PDF document text
    • https://cdn.sqhk.co/xedufoga/h0jbGig/riroxofabuzaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://likuxusodim.epizy.com/71459570830.pdfIn PDF document text
    • http://mopufeva.epizy.com/free_editable_name_tracing_worksheets_for_preschool.pdfIn PDF document text
    • http://texatopewewew.epizy.com/rewez.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_off0000f0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F2 5084 bytes
SHA-256: 5cc7eeab97b14a1f7729bf03281378e5fedfb7cd1d08bc4eaaa91097d44bbd64
font_01_sfnt_off00010238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10238 10832 bytes
SHA-256: b4782edb9654aa482e37bd0488c1f9da352dcacaef71675fa8cbf70fc3434e56

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