Malicious PDF — malware analysis report

Static analysis result for SHA-256 237adf5c52ef2bd3…

MALICIOUS

PDF

70.3 KB Created: 2021-03-23 23:07:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8684f40e7260b4ced85030dbc050c8d4 SHA-1: 5833cbbeaf95fd217eeaef7bcf39db9e9fe78ffc SHA-256: 237adf5c52ef2bd3833d315210dd3e6543be41678407bc4b40854a2813960f2d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a suspicious domain associated with phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest a tactic to generate traffic or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://nipisod.ru/strik?utm_term=locked+out+of+heaven+fingerstyle+tab PDF link annotation
    • http://scoretdho.best/20954321206dmlve.pdfIn PDF document text
    • https://lafajadisevo.weebly.com/uploads/1/3/1/4/131454770/9cf07f75.pdfIn PDF document text
    • http://cafe-cok.ru/how_to_change_a_filter_on_a_tankless_water_heateryi6rl.pdfIn PDF document text
    • http://juriravi.iblogger.org/gameboy_advance_apk.pdfIn PDF document text
    • https://tiwixuferexo.weebly.com/uploads/1/3/1/3/131380596/9257216.pdfIn PDF document text
    • https://wuduzavuvavazi.weebly.com/uploads/1/3/4/6/134618101/dejafajilu_nugajukoro_wiforizajo_jetelulab.pdfIn PDF document text
    • https://dununatanag.weebly.com/uploads/1/3/0/7/130775655/2dedecb9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jigezilor/braintree_scientific_syringe_pump_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/a_level_chemistry_revision_notes_aqa.pdfIn PDF document text
    • http://jagakemiwowinig.epizy.com/orchidaceae_family.pdfIn PDF document text
    • http://zinagurimobep.rf.gd/57469669332.pdfIn PDF document text
    • http://finuzajobozosom.epizy.com/19777587215.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/acthar_gel_start_form.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/recupero_foto_eliminate_android.pdfIn PDF document text
    • http://rumukejilaji.epizy.com/vehicle_sale_agreement_format_in_word_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/falejogajir/35159826919.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/psychological_perspectives_in_education.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_off0000d543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD543 5588 bytes
SHA-256: 59e39251f8cc9e7077d3d2cd4fa66c4abd4ad49a1bfbffea155d220d744e29ba
font_01_sfnt_off0000e859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE859 10380 bytes
SHA-256: a52c7f3f1761770e8ad592256bce9dbc2085a29e6a0c2ea1756fcb4da31c2f0f

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