Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8621dcb34064c3…

MALICIOUS

PDF

74.5 KB Created: 2021-02-23 07:02:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 0a72210bf1d4f6afe4ed3615f0bea923 SHA-1: 27dd4e615abcc4056c1e6adbc7a3fd2f0c539b3b SHA-256: 4c8621dcb34064c30338d36a5a69d8feb6de7a51a87b3d32394283de3fe2523b
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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.
  • 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://crophysi.ru/wb?keyword=nancy%20drew%20and%20the%20hidden%20staircase%202 In PDF document text
    • https://tonusawojojumo.weebly.com/uploads/1/3/1/3/131384735/f73ef3a29c.pdfIn PDF document text
    • http://fruit-citrus.space/discografia_de_conjunto_primaveraju07k.pdfIn PDF document text
    • http://unlockdeals.shop/libro_el_alquimista_resumenxwf21.pdfIn PDF document text
    • http://matteset-spon.space/kedulopuzezabumesitasibu73zwj.pdfIn PDF document text
    • https://melonugijiroduk.weebly.com/uploads/1/3/5/3/135325977/1e702ce6.pdfIn PDF document text
    • https://noruwapawufibem.weebly.com/uploads/1/3/0/9/130969999/c3edd8ba504848a.pdfIn PDF document text
    • https://vapasunodisina.weebly.com/uploads/1/3/0/8/130873802/0af392d.pdfIn PDF document text
    • http://mnogolidov.xyz/west_antarctic_ice_sheet_collapseo3r7k.pdfIn PDF document text
    • https://muvitexovab.weebly.com/uploads/1/3/4/6/134639258/099932d5e733.pdfIn PDF document text
    • https://jinobodusere.weebly.com/uploads/1/3/4/7/134722577/bikeju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481400/normal_5fd80e4109ade.pdfIn PDF document text
    • http://form-lnstagramverifiedbadges.com/xepotorike5l22k.pdfIn PDF document text
    • https://letolikasepa.weebly.com/uploads/1/3/4/6/134625664/jetedixuxe-bozomis-sokofutoli.pdfIn PDF document text
    • https://vogavova.weebly.com/uploads/1/3/1/6/131606390/3798994.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/titugome/fluid_therapy_guidelines_vet.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_off0000e41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41B 5288 bytes
SHA-256: 8822fb8ef2d50def43bdd0cdb966a11276183a2d714118fc7253ba3a826c9535
font_01_sfnt_off0000f62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62F 11396 bytes
SHA-256: 618bc140bba2aff0b855dfffd3032b4977675436ad3339585d7a8bc9c60e3690