Malicious PDF — malware analysis report

Static analysis result for SHA-256 449662cea2a53bd2…

MALICIOUS

PDF

76.9 KB Created: 2021-03-25 09:36:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f637de139ebae182fd824aa7295e487c SHA-1: 6fdd84210fce362a447f90cea6bc97431febc3ca SHA-256: 449662cea2a53bd27a7f2bd84690093b48c007740c7657b381fd3922f70cba87
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting it functions as a link farm. The heuristic 'PDF_SEO_LINK_FARM' and the presence of multiple 'unknown' reputation URLs indicate a malicious intent to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of phishing or SEO manipulation tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/strik?utm_term=duraflame+electric+fireplace+ratings PDF link annotation
    • https://wosobariwosamu.weebly.com/uploads/1/3/4/3/134372044/5224967.pdfIn PDF document text
    • https://favonewe.weebly.com/uploads/1/3/2/6/132695639/topunikepe-nobatozogipiwus-semoje-ganoxefuselorub.pdfIn PDF document text
    • http://metryck.info/2nd_grade_money_word_problems8y9bi.pdfIn PDF document text
    • http://mail-autoscout24.net/bowflex_powerpro_xltz23bc.pdfIn PDF document text
    • https://ruwijupoxotafan.weebly.com/uploads/1/3/0/8/130814308/fizibu.pdfIn PDF document text
    • https://walazufa.weebly.com/uploads/1/3/1/3/131383665/lunizovekoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446285/normal_600602a1903a8.pdfIn PDF document text
    • http://dalnoboyi.xyz/28784205753i29bk.pdfIn PDF document text
    • https://gidisapawifo.weebly.com/uploads/1/3/4/6/134611794/kodizunonal.pdfIn PDF document text
    • https://zewekoli.weebly.com/uploads/1/3/5/9/135966642/93eb85c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448330/normal_60496d3e599a3.pdfIn PDF document text
    • https://xuvesebitewetok.weebly.com/uploads/1/3/6/0/136086761/wilidisuwakape.pdfIn PDF document text
    • https://minadefimufev.weebly.com/uploads/1/3/4/6/134635785/biwejozux.pdfIn PDF document text
    • https://rulafusojuxibaw.weebly.com/uploads/1/3/4/2/134265871/2175aa9a39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490370/normal_6001e6ee7c3aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475874/normal_6041b9165cf8d.pdfIn PDF document text
    • https://muxudopigudud.weebly.com/uploads/1/3/4/4/134490596/merimoxibilifekiposa.pdfIn PDF document text
    • http://fullcreditreport.info/how_to_figure_out_lattice_energyhj8h3.pdfIn PDF document text
    • https://zeraxoxuret.weebly.com/uploads/1/3/4/6/134642117/4808773.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462974/normal_603d433f385e1.pdfIn PDF document text
    • https://lutomired.weebly.com/uploads/1/3/5/3/135316507/f4d8c589fc00.pdfIn PDF document text
    • https://nepuxobim.weebly.com/uploads/1/3/5/3/135304691/sedasabamiwaku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_2c8972a6c9c046ae976a1f8788d0f9b0.pdf?index=trueIn PDF document text
    • https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_574c1cc742604d4e8deedd6f5d65e49e.pdf?index=trueIn PDF document text
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_117c57fc955142e0a6b25e86a90d22c6.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_off0000eebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBC 5332 bytes
SHA-256: e77714581a8e9f50dbaf36b75d1d81b7296f10e35b90d998f3173798ee74bc4e
font_01_sfnt_off000100d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D6 10940 bytes
SHA-256: 704ddf5f6fbd06d450ca8a57a8f275a6d15c8b283b23e0ea3be891fbf76ca88c