Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd910266cb3f0dcb…

MALICIOUS

PDF

73.7 KB Created: 2021-02-02 21:46:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1c053e624acac57a093c195faedb2c12 SHA-1: 0b47b8ee6d49399a776359794b679d58f2a94e18 SHA-256: fd910266cb3f0dcbff44befe460fb959f4f8fde40be8a5f07ce4413db417e99d
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, many of which point to other PDF documents, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful 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://maypoin.ru/123?utm_term=otium+wireless+earbuds+volume+control PDF link annotation
    • https://jutarufuro.weebly.com/uploads/1/3/0/7/130775772/sanubisodikupu.pdfIn PDF document text
    • https://cdn.sqhk.co/duloputemab/jfVjchi/pinball_machine_project_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/gdP8vif/sky_clash_lords_of_clans_3d_cheats.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411218/normal_5ff8ec97956aa.pdfIn PDF document text
    • https://vofaxarexokuj.weebly.com/uploads/1/3/4/7/134762848/fabababudolux_xorokotipe.pdfIn PDF document text
    • https://cdn.sqhk.co/ratevusur/DEQhgid/solar_system_planets_facts_earth.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365634/normal_5fc94e6e22f1b.pdfIn PDF document text
    • https://cdn.sqhk.co/nebuwaxisiw/bgjijgT/karujiwigagazisolotaperu.pdfIn PDF document text
    • https://pekafulif.weebly.com/uploads/1/3/1/4/131437409/nebib.pdfIn PDF document text
    • https://cdn.sqhk.co/xedufoga/ifhfjbG/dentures_and_demons__2.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/nefunupu/vakilitijuxojulov.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/bendy_and_the_ink_machine_book.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/gomodefojibule.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/bmw_brochure_3_series.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/possible_interview_questions_for_nurses_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/materi_biologi_sma_kelas_x.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/chicago_manual_of_style_capitalization_government.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/histology_quiz_epithelial_answers.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_off0000e029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE029 5404 bytes
SHA-256: 7dc11a508e4e310000f7191ad47a915785be90372b22b01785671dc4dc008fc3
font_01_sfnt_off0000f280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF280 11340 bytes
SHA-256: cbc70045774377e20dd1f7847429ef94ab55020be7c551d796c997eba0cfcaf3

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