Malicious PDF — malware analysis report

Static analysis result for SHA-256 23136a8eeac52953…

MALICIOUS

PDF

78.0 KB Created: 2021-05-07 05:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fd8192c5bdfc699b975a61e404dcfeeb SHA-1: 22fe1ab091fa7d6e093cb9cdadc284fcbdbfde79 SHA-256: 23136a8eeac52953105f873e0009a183c41c10c47b8807e1ffadec764a285fc9
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 hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though obfuscated, contains a title related to installing a pipe union, which is likely a lure to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://gimoguvi.ru/strik?utm_term=how+to+install+a+threaded+pipe+union PDF link annotation
    • http://wupofifaxixusi.66ghz.com/henderson_far_east_income_fact_sheet.pdfIn PDF document text
    • http://tegogufe.22web.org/forest_lakes_metro_district_map.pdfIn PDF document text
    • http://ipatovaalena.ru/89094848842hkfvu.pdfIn PDF document text
    • http://wugafis.66ghz.com/18691733204.pdfIn PDF document text
    • http://rukozhop-guide.com/962488557047zwxy.pdfIn PDF document text
    • http://pedazupemadid.22web.org/90744964721.pdfIn PDF document text
    • http://axecheat9.xyz/9243969125tjzma.pdfIn PDF document text
    • http://centerbluebadge.com/50289028802zgg64.pdfIn PDF document text
    • http://vykupavto54.ru/dezerosoxorexipenufotavixgef7d.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sanikivatuma.rf.gd/posenonap.pdfIn PDF document text
    • http://pavasokunise.epizy.com/biodata_template_for_marriage_in_word_format.pdfIn PDF document text
    • http://tirizalewofux.rf.gd/funo_da_acetilcolina.pdfIn PDF document text
    • http://dizerexipit.rf.gd/gajetamex.pdfIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_46825d6c306d4e08ab8d24c795d4e31f.pdf?index=trueIn PDF document text
    • http://nadefivetokilak.rf.gd/34173481079.pdfIn PDF document text
    • http://vepilezora.epizy.com/mapamundi_politico_mudo_para_imprimir.pdfIn PDF document text
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_97f3a4bcf666403b8af0a0e57b8569d9.pdf?index=trueIn PDF document text
    • http://vigogogakuza.epizy.com/when_will_they_release_season_2_of_the_witcher.pdfIn PDF document text
    • https://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_5ac2e71f016d4f8684e055e4c9e58ede.pdf?index=trueIn PDF document text
    • http://wilafeduzavedew.epizy.com/xanafef.pdfIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_a514c3b7dea84cde9511bc22e9aa6631.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_off0000f3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DA 5100 bytes
SHA-256: 63e703fbc9d79aabd6f5a02d1ec6d65651be92b45e3549602ab9452a0c194ab0
font_01_sfnt_off00010538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10538 11200 bytes
SHA-256: 9c56d4c7ad83470f8e4da2e327e4950569c941c0a161416c283120d4949aa69f

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