Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a1539572e9b8fb…

MALICIOUS

PDF

77.6 KB Created: 2021-03-23 05:44:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c23f2b796b9cda743dc054edfef4d4df SHA-1: 85bc248e4d13fda1684c03a4bf7275f4430f0917 SHA-256: 81a1539572e9b8fbdaa8d1e2cc84ac1ea55e40b03b431f0c3807c3159676713a
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are associated with link farms, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing and trojan activity. The document body, though heavily obfuscated, contains references to 'Vegas pro 9.0 crack free', suggesting a lure for illegal software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 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://ponafet.ru/123?utm_term=vegas+pro+9.+0+crack+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366020/normal_5ff29491a038f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377663/normal_5fcff2be4084f.pdfIn PDF document text
    • http://natiwuzoxosob.22web.org/how_to_apply_psychological_first_aid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486200/normal_5ff4212e3113e.pdfIn PDF document text
    • http://latencfsrt.space/82440879672sljrn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409107/normal_60012e6d2e17d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418013/normal_6057b02f431fd.pdfIn PDF document text
    • http://copyrighthelp.info/raminodugitevixugagegcpet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468296/normal_604dcd41c47b4.pdfIn PDF document text
    • http://pakidewomidorov.iblogger.org/80246402811.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500425/normal_601d4c8154775.pdfIn PDF document text
    • http://matras-24.ru/juvevijuvezawutetugopitujxq5o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuzotulerijenej.rf.gd/6592957075.pdfIn PDF document text
    • http://varoniwarovez.rf.gd/46993345077.pdfIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_a2b469955f774a089274f998da1465ac.pdf?index=trueIn PDF document text
    • http://jobifizokugo.rf.gd/8403704995.pdfIn PDF document text
    • http://xinetonorus.epizy.com/capitulo_8a_prueba_8a-_2_answers.pdfIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_f6d220f86c8b425b87a404757b1e854a.pdf?index=trueIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_57dd6e9cc1bd4fe1880ab45b712e89a3.pdf?index=trueIn PDF document text
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_cc7e5315d61e4eab89a21b850d2ccae3.pdf?index=trueIn PDF document text
    • http://giratas.epizy.com/amit_goswami.pdfIn PDF document text
    • http://roxutudutupit.epizy.com/webesadazasigosezuvom.pdfIn PDF document text
    • http://jujujinoxilumaz.epizy.com/curso_tecnico_de_tecnologia_da_informao_senai.pdfIn PDF document text
    • https://11fe2947-f393-4df3-905d-f9f3730e834a.filesusr.com/ugd/b1b16e_2d7c55e7eb4f43e788e5911367624348.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_off0000e104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE104 5508 bytes
SHA-256: db33baea18e2e3eccb7d6b77322ba3c2b08571035ad00feefc5b8d889f4c7fca
font_01_sfnt_off0000f3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E8 23556 bytes
SHA-256: 3e43db796b4c545e78432d7dba29ba11fd8d6c57ef5b2c0f3ffdeac4c5e66a77