Malicious PDF — malware analysis report

Static analysis result for SHA-256 7edc34724e487a1c…

MALICIOUS

PDF

87.5 KB Created: 2021-03-09 13:03:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7f9f9207dbe613f81da73fb169741a5a SHA-1: 28277b1f5f578c195d9087f978899c535edc74c5 SHA-256: 7edc34724e487a1cd2cf07c01e4eeb7cdea738a8418418c463d80f84eb7a1087
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 services, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=how+to+punctuate+quotation+marks PDF link annotation
    • https://baseparefawufif.weebly.com/uploads/1/3/1/4/131453046/104348.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470839/normal_5ff00efe88c2c.pdfIn PDF document text
    • https://tazuwadafif.weebly.com/uploads/1/3/4/8/134857375/vezimalizifa_zivosuguzatewi_dorogidokum_sibudabefowob.pdfIn PDF document text
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/582339.pdfIn PDF document text
    • https://godivibodo.weebly.com/uploads/1/3/4/0/134040440/munopilifi_fuzalinex_rowuxesewepela_zarejox.pdfIn PDF document text
    • http://wefigofozotime.22web.org/74632526726.pdfIn PDF document text
    • https://kaferafodi.weebly.com/uploads/1/3/0/7/130775544/7611507.pdfIn PDF document text
    • https://losiweso.weebly.com/uploads/1/3/1/3/131380476/03652.pdfIn PDF document text
    • https://dubanivexog.weebly.com/uploads/1/3/4/3/134331992/3db5f892c88eec.pdfIn PDF document text
    • https://tirepululavapiw.weebly.com/uploads/1/3/4/5/134576363/muzoxoxifon-zupilo-gipulak.pdfIn PDF document text
    • https://ramipataxeki.weebly.com/uploads/1/3/4/4/134483057/53e0f0a23f16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391340/normal_5fc5f5b26064d.pdfIn PDF document text
    • https://nolutoxut.weebly.com/uploads/1/3/4/6/134683805/93dd4.pdfIn PDF document text
    • https://babibogek.weebly.com/uploads/1/3/1/3/131379554/1878913.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393220/normal_600a816a79741.pdfIn PDF document text
    • https://bekajujoxofutit.weebly.com/uploads/1/3/1/4/131406668/90df79140.pdfIn PDF document text
    • https://davabodijesofid.weebly.com/uploads/1/3/4/4/134474123/263694.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451044/normal_600a0eb54b869.pdfIn PDF document text
    • https://surigogalabilix.weebly.com/uploads/1/3/5/9/135961506/zipuximutam_mogebadopavedaf_kukobumo_bivukirokesu.pdfIn PDF document text
    • https://rakuwogu.weebly.com/uploads/1/3/4/8/134858672/pexepan.pdfIn PDF document text
    • https://voteweze.weebly.com/uploads/1/3/5/3/135346586/6734927.pdfIn PDF document text
    • https://gokuxevi.weebly.com/uploads/1/3/4/0/134017514/pomosamovaruz_rupigez_mabugev_gexeva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tededuliwe.rf.gd/molybdenum_element.pdfIn PDF document text
    • http://jizuwugi.rf.gd/lafami.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_off00011902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11902 5288 bytes
SHA-256: 628a0857f3f645d90077d1b377bd7061bf89c79a43f81924b8443d5595776727
font_01_sfnt_off00012b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B01 10984 bytes
SHA-256: 88811f6c2fd0de9d3c8ab4136845e1c1d40a62efa0d4428a4ae8528ea1d6a783