Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9aefd2fde6ac92b…

MALICIOUS

PDF

77.1 KB Created: 2021-03-03 18:07:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 37a0349cb90f41e82c6e141e5d5bff88 SHA-1: 9b1c951332626a656347acf60476f6ab9ad70736 SHA-256: b9aefd2fde6ac92b4298d37a10f90de9b9045f1b3224871526c7fbe05a4595f0
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains a large number of external links, with the primary one pointing to 'seumenha.ru', suggesting a lure to a malicious website. The heuristic 'PDF_SEO_LINK_FARM' indicates the PDF is designed to host numerous links, likely for SEO manipulation or to distribute malware/phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://seumenha.ru/aws?utm_term=how+to+clean+vitapur+water+dispenser PDF link annotation
    • http://punavuvipufov.sportsontheweb.net/is_shipping_expense_a_mixed_cost.pdfIn PDF document text
    • https://regakoxunurur.weebly.com/uploads/1/3/4/3/134380337/moxibalisamasaf_nudew.pdfIn PDF document text
    • https://mojoranazo.weebly.com/uploads/1/3/4/4/134403481/d6fbca50.pdfIn PDF document text
    • http://movivuvafozor.iblogger.org/best_social_media_management_platform.pdfIn PDF document text
    • https://lulofaki.weebly.com/uploads/1/3/1/4/131453598/vowexevob-mikilat.pdfIn PDF document text
    • http://janorewaxeno.mygamesonline.org/stairway_to_heaven_guitar_solo.pdfIn PDF document text
    • https://sukivafuxek.weebly.com/uploads/1/3/0/8/130874221/xibal.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/do_minors_need_id_to_fly_southwest.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/descargar_musica_anthony_santo_en_vivo.pdfIn PDF document text
    • http://nijagegedok.22web.org/nespresso_lattissima_one_manual_espaol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://donijexufenu.onlinewebshop.net/47849575920.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/sputnik_education_reform.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/gagilawatupuvusafi.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/bijegimoroxepagofobexos.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/bristol_cathedral_primary_school_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/is_movie_never_die_alone_on_netflix.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/akon_freedom_video.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/appraisal_form_2055.pdfIn PDF document text
    • http://wavudipikudela.epizy.com/gomulanirubejugowabikawup.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/fast_typography_after_effects_template_free.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_off0000f142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF142 5180 bytes
SHA-256: f5f75112fdd4ca7724f8e003ae62e268021ccd75010eea0e2d93c8f513fcd6ec
font_01_sfnt_off00010308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10308 10548 bytes
SHA-256: 8d4ccf0f89c1c3b6374d02b3db3ea628547946a346380de29fd35d0c0eb8b2f5

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