Malicious PDF — malware analysis report

Static analysis result for SHA-256 350bc4a06fe60839…

MALICIOUS

PDF

98.6 KB Created: 2021-05-02 19:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a19f15732c1762695d3169b3b6ec281c SHA-1: 2fc7a075704df92c212e0928d6ef8e91a6655c49 SHA-256: 350bc4a06fe60839142525c4377e444ac36cde46207100b72301c53012e84202
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=implied+metaphor+meaning+definition In PDF document text
    • https://mufusudakewita.weebly.com/uploads/1/3/2/6/132681672/xoditinotisapexan.pdfIn PDF document text
    • https://welirupew.weebly.com/uploads/1/3/4/6/134662060/c9275.pdfIn PDF document text
    • http://zisezamerares.mygamesonline.org/call_of_cthulhu_lovecraft.pdfIn PDF document text
    • http://kunepuvobimamin.medianewsonline.com/orthographe_gratuit.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/gjAig5p/25700868804.pdfIn PDF document text
    • https://jufukakoxojopop.weebly.com/uploads/1/3/4/3/134317893/disekag.pdfIn PDF document text
    • http://fumexijana.getenjoyment.net/how_long_does_it_take_to_be_approved_for_disability_support_pension.pdfIn PDF document text
    • http://zitukuwekoba.sportsontheweb.net/ukulele_tab_songbook.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/CFgdiND/wobokosomapodotiw.pdfIn PDF document text
    • https://cdn.sqhk.co/xidodaxu/drjiieL/e_bikes_near_me.pdfIn PDF document text
    • https://mifanalukuzesu.weebly.com/uploads/1/3/4/6/134688284/8ac69cc61.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
    • https://s3.amazonaws.com/baxadelefofibuz/sea_alumnos_plataforma.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/free_christmas_math_worksheets_for_kindergarten.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/xudadimok.pdfIn PDF document text
    • http://lumosaneja.onlinewebshop.net/pojulifigawelabibizu.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/elna_supermatic_sewing_machine_price.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/xulolebotuduxatumiki.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001337e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1337E 5000 bytes
SHA-256: 73fc940c65a780376d0da87a573a92475d567556859c4545128ec133f25689ea
font_01_sfnt_off00014450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14450 13584 bytes
SHA-256: 3dfb7c2dc7f16402fc99826975d20638506cc824d79b33f157cfdeebd8d19c93
font_02_sfnt_off00016f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F52 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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