Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6817b670a592b10…

MALICIOUS

PDF

79.2 KB Created: 2021-03-15 08:35:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4c026cd1355c4d77eadd7b073f0ef29e SHA-1: 796eeb99a074285fe5761c2e4d23d47aaf9e184a SHA-256: b6817b670a592b10d443bfb0a94099a6f425fa219a2b0fe38c0069a6174c1a86
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. ClamAV and ML classifiers also flagged this file as malicious. The presence of external URIs and the link farm heuristic indicate a deliberate effort to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://zajinet.ru/strik?utm_term=how+to+thread+singer+fashion+mate+237 PDF link annotation
    • http://gooddevice-online.com/dipavemopifomosudenakovac9mcd.pdfIn PDF document text
    • http://firstsecu-paypal.com/health_o_meter_scale_what_does_lo_mean92wee.pdfIn PDF document text
    • http://bewizasosu.sportsontheweb.net/18706600899.pdfIn PDF document text
    • http://rebezun.mygamesonline.org/antigona_lektira.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450145/normal_60051bf02884d.pdfIn PDF document text
    • http://jukejed.mypressonline.com/autism_diagnostic_interview.pdfIn PDF document text
    • http://fastcreditcheck.info/xugikebudusaboreo2hm4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420907/normal_603926c42bd90.pdfIn PDF document text
    • http://sugegixojavuro.iblogger.org/kawapo.pdfIn PDF document text
    • http://secureappeal.com/loteria_de_silabas_trabadase9ii8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456143/normal_600e6d9f93632.pdfIn PDF document text
    • http://xilatotes.sportsontheweb.net/lakapedidatipinezivakuxof.pdfIn PDF document text
    • http://tersq.space/gusarudewemibutyikr7.pdfIn PDF document text
    • http://jasubizajimalep.iblogger.org/97616843708.pdfIn PDF document text
    • http://zisapawiwako.mypressonline.com/72611561900.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zedovapovakodev.rf.gd/jikekulavafopixofip.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/android_recovery_mode_no_command_fix.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/pmi_agile_practice_guide_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/jira_api_report.pdfIn PDF document text
    • http://xakodalomidu.rf.gd/zumerosodizaso.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/autocad_software_price_philippines.pdfIn PDF document text
    • http://bupalim.atwebpages.com/67349003719.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/binary_fission_budding_and_spore_formation.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_off0000f6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D0 5720 bytes
SHA-256: 4bd6bfb86a23b0e131d588f99e3c5a9eb489174dd008448b40e02ccdd71fdc64
font_01_sfnt_off00010a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3A 10428 bytes
SHA-256: f4e9edfe8e4a071dd3cc99459376ce9436e25afaf11a251762c5391a8e751510

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