Malicious PDF — malware analysis report

Static analysis result for SHA-256 383bb44492d4c6e8…

MALICIOUS

PDF

114.6 KB Created: 2021-02-23 22:46:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8dc084ef5520d09af2f9905fd9f19b9d SHA-1: 0011d913c3feb8ab30ef0544026b0846214d28af SHA-256: 383bb44492d4c6e8b99379e5bb2dc2293e5d2352b4218836c9a1c46a29c57cd2
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious content.

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 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/wix?keyword=emoji+quiz+answers+man+and+book PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412396/normal_6015442a99795.pdfIn PDF document text
    • http://bukibiroxofin.22web.org/how_to_port_sim_mnp_idea.pdfIn PDF document text
    • https://bagibobujinokat.weebly.com/uploads/1/3/5/3/135312275/07fdcf1.pdfIn PDF document text
    • https://zosifoke.weebly.com/uploads/1/3/0/8/130813504/xujikogefamefeja.pdfIn PDF document text
    • http://ijmalan.xyz/19605679692n3l8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368235/normal_60082c9070d31.pdfIn PDF document text
    • https://febosefukeja.weebly.com/uploads/1/3/5/3/135324858/fesisipifonav.pdfIn PDF document text
    • http://sportplays.ru/wizard_how_to_draw_comicso3mm9.pdfIn PDF document text
    • http://dkmz3.club/baby_phone_number_whatsapp_addz9mh4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kidojudal.epizy.com/globo_reporter_horario_que_comea.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/tungsten_electrode_color_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/fegumaxisobele.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/todixosaziwubozo.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/1960_evinrude_18hp_fastwin_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/bengali_astrology_app_free.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_off000179be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179BE 5444 bytes
SHA-256: 80c02f915a0ca13327e987d0b55144f566305a8c58b1cafab965fc18e92f371d
font_01_sfnt_off00018c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C46 15960 bytes
SHA-256: 66cc706fc60f0fd28f11c716f9d31a0061c74949e217aa780ef709eafae5e8db

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