Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b00ec4923e4fea…

MALICIOUS

PDF

65.8 KB Created: 2021-04-07 20:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa9c52935b6ed15835781ce5b1d0d82e SHA-1: 66bbd36b9e47876cb4ecffa8e2e1bd6e230b49a6 SHA-256: 83b00ec4923e4fea59544499dd8e62fb727ffa6139ef4ddde162a71e8b187d7f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate a deliberate effort to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/aws?utm_term=pentair+whisperflo+pump+seal+kit
    • https://cdn.sqhk.co/fuvebopeweb/ihdNhiN/gopatopeziwopisenuragu.pdf
    • https://kivinogafuwej.weebly.com/uploads/1/3/4/7/134702495/19595bc50ad6.pdf
    • https://sipafurewos.weebly.com/uploads/1/3/4/5/134581680/fikajox.pdf
    • https://cdn.sqhk.co/sexuzoropa/ji7TggM/73973991471.pdf
    • http://azules.ru/liladare8zhz3.pdf
    • https://kumakisatosoref.weebly.com/uploads/1/3/5/3/135328720/8930114.pdf
    • https://tovexalo.weebly.com/uploads/1/3/5/3/135348509/88961041.pdf
    • http://logunej.iblogger.org/feelings_worksheets_1st_grade.pdf
    • http://bluetea.space/mimefoxolixexe5bh1k.pdf
    • https://cdn.sqhk.co/zobazulibes/gohJhjr/2335202681.pdf
    • https://cdn.sqhk.co/rapowipijes/bhcjfqg/potimawakupegilo.pdf
    • http://findattime.com/xebefeledezetotupu6ryg.pdf
    • http://ludivabuka.iblogger.org/drink_menu_templates_microsoft_word.pdf
    • https://cdn.sqhk.co/jetobatu/bjhK8qK/61286699754.pdf
    • https://cdn.sqhk.co/vawadawuleja/ib5k5Jr/recargas_para_cuba_hoy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nonipesikiri/lista_de_verbos_en_ingles_y_espaol_mas_usados.pdf
    • http://vukanaxugosazed.rf.gd/pakikefaju.pdf
    • https://s3.amazonaws.com/laginekux/assessment_for_learning_formative_assessment_difference.pdf
    • https://s3.amazonaws.com/ligole/developing_listening_skills_2_answer_key.pdf
    • http://dubemizene.rf.gd/r12_to_r134a_conversion_kit_oreilly.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c374.bin
49e4824853c9f9e22bece4f6a0d32c97c77c41570b03fd5eeaeba02481c211e5
pdf-font-stream PDF embedded font (sfnt) at offset 0xC374 5300 bytes
font_01_sfnt_off0000d55d.bin
b90760815c330d2b4850577957fd8544407d9128d6ace701ede0d850d7a865a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD55D 10748 bytes