Malicious PDF — malware analysis report

Static analysis result for SHA-256 452405247d9c700c…

MALICIOUS

PDF

75.2 KB Created: 2021-03-14 12:25:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6eff88c7518a29c1e20b900477e297bd SHA-1: d65d951c2e418b83130fe6b6996e5bfc767fdc29 SHA-256: 452405247d9c700cd1413ed96ea1d2b6983692a006f68072a58ccd14bb383b0b
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the presence of external URIs and the overall heuristic profile points to a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/award?keyword=mean+median+mode+for+grouped+data+pdf PDF link annotation
    • https://cdn.sqhk.co/sivadapexiri/ieabggY/xugeledav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459482/normal_5fc6203cc2e6c.pdfIn PDF document text
    • https://cdn.sqhk.co/lupokuna/fiizGN7/padojawuwevodotarowumolaj.pdfIn PDF document text
    • https://cdn.sqhk.co/mebozesilo/PvicxBP/zobabifetepodudajave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464534/normal_603e3bffaaa00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456685/normal_6036a44612487.pdfIn PDF document text
    • https://cdn.sqhk.co/galudubujuwa/i6icqen/20909842346.pdfIn PDF document text
    • https://cdn.sqhk.co/tejilunuf/hhdhdhj/namofosiribenoza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a07304e-3c2b-4e50-be6b-aff8f058fec5/que_es_la_organizacion_deportiva_educacion_fisica.pdfIn PDF document text
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_4a7a5126f4214b9380d2ecd3eb430453.pdf?index=trueIn PDF document text
    • https://57fc24c6-ba7c-430a-bdae-05304608b610.filesusr.com/ugd/bc9c68_00b37858b0884f4db64c09c2664226d7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9454b6b-06f3-48e8-a104-181a02c21c17/25619138427.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ede7c22-b02b-4379-aed4-1708c31f7c8a/multiple_intelligences_meaning_tagalog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57394fb6-099b-44d7-8933-2c9c8ff5836f/cant_login_to_wordpress_localhost.pdfIn PDF document text
    • https://35057dd6-1d18-4acd-96c9-af3b7fddc7cd.filesusr.com/ugd/978dd5_ca9d53cb487549f7a6ef6c478e1b79d2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a280b275-4ad6-4f8f-8404-967c48298b0a/24329921272.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56511078-7b4b-47ac-869c-88f09e02fac6/64431322917.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0244a33-bee4-48b2-9adf-2a2b85c6900c/kodak_esp_office_2150_printhead_carriage_jam.pdfIn PDF document text
    • https://94ac7338-8c66-48ed-b7e4-01cccba3eff0.filesusr.com/ugd/9b8421_049c7887e12844fb8fd35664792b7428.pdf?index=trueIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_9d41b181eab44cd693b7e47fee957983.pdf?index=trueIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_c0538a94524f483da8f9d5c67ad8017e.pdf?index=trueIn 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_off0000e939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE939 5156 bytes
SHA-256: b735a7066eb71f22064a983fa5c5eefed2862862e67d282ca4cdb9728b8882e1
font_01_sfnt_off0000fabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABE 10612 bytes
SHA-256: 0e28ef4e1c2b73bdfea6c296111a264b3889afb56440e6ef71606041b1e44504