Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b12fc9b14a9c88…

MALICIOUS

PDF

81.1 KB Created: 2021-03-25 16:08:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 85bdb106bb70913364e5b7d52a2a0b55 SHA-1: 7bfc2a6b4ee0dff231facc0e9f32787f89be737b SHA-256: d9b12fc9b14a9c885112759d380be5a3e2a1620aee87a5c40023fc4a48bc8bee
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains keywords related to PDF manipulation, suggesting a lure. The presence of multiple external PDF links, some pointing to potentially malicious domains, further supports the phishing and redirection attack pattern. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/award?keyword=rearrange+pages+in+pdf+adobe+reader+11 In PDF document text
    • http://netopodimamo.mywebcommunity.org/public_provident_fund_rules.pdfIn PDF document text
    • http://icub.tech/wesulexuzakedetixaxukuexgd8.pdfIn PDF document text
    • http://center-san.ru/fopobud9vi.pdfIn PDF document text
    • https://nejotadig.weebly.com/uploads/1/3/1/1/131164569/3085824.pdfIn PDF document text
    • http://carbackseat.site/what_does_f02_mean_on_a_washing_machinemw9mc.pdfIn PDF document text
    • https://kikuramem.weebly.com/uploads/1/3/2/7/132740701/wudigun.pdfIn PDF document text
    • http://apsmall.space/kenmore_80_series_washer_weightizssy.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/6ihlgiR/33452463946.pdfIn PDF document text
    • http://edevletorg.com/2446137627sk2r4.pdfIn PDF document text
    • https://povaxabo.weebly.com/uploads/1/3/5/9/135976235/4f048137e.pdfIn PDF document text
    • http://kositexujir.sportsontheweb.net/blank_map_of_central_america_and_the_caribbean.pdfIn PDF document text
    • https://cdn.sqhk.co/dibitarebizu/8ggsgju/download_gogo_live_mod_apk_latest_version.pdfIn PDF document text
    • https://cdn.sqhk.co/xeribaba/iL4gghg/zixenesemibem.pdfIn PDF document text
    • https://dawipufa.weebly.com/uploads/1/3/3/9/133986453/8826935.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/rubidokezive/how_to_crochet_beginners_step_by_step.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/gdpr_policy_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/chablis_vintage_report_2015.pdfIn PDF document text
    • http://sajoveguduv.onlinewebshop.net/technical_interview_questions_on_dbms.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/99634221337.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/xufeguvipajaxusaxido.pdfIn PDF document text
    • http://xakazasaravi.onlinewebshop.net/propiedades_fisicas_y_quimicas_de_los_alcanos.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/fajezezorepujujepe.pdfIn PDF document text
    • http://wadoromutisagar.myartsonline.com/abbie_hoffman_steal_this_book.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/consul_template_github.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_off0000fd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD80 5376 bytes
SHA-256: f43e131ee7cb2ffc37830019d97265dcaef6d7bc8c548601eb31581aac37f862
font_01_sfnt_off00010fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE0 10896 bytes
SHA-256: d69a3410124ba6520236944de203ad9e01128ae5baf46771d3831917a8796e9f

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