Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fb3f3640c8c96a0…

MALICIOUS

PDF

83.9 KB Created: 2021-03-02 13:33:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 28025a3773e9cae46a568724eebe93d1 SHA-1: 6d67ea93d5eb280d2d0dbe219ecb87a3145cea29 SHA-256: 9fb3f3640c8c96a0487cda55f10a4beee0c8acf4a570eb38550ce7d66159ce70
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

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 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://kuzutuzo.ru/strik?utm_term=vizio+sb3820+c6 PDF link annotation
    • http://usersdeviceprotectionservice.site/renuxalegedawetulezijxmeh7.pdfIn PDF document text
    • https://lonexababite.weebly.com/uploads/1/3/1/1/131163854/neraseb.pdfIn PDF document text
    • https://xijukuto.weebly.com/uploads/1/3/4/3/134354051/xuwuvus.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/bH7b18m/88345142167.pdfIn PDF document text
    • http://kersita.space/97823423606byj64.pdfIn PDF document text
    • http://indohealth365.online/west_african_countries_and_their_capitalsj105s.pdfIn PDF document text
    • http://muziwavesos.iblogger.org/calcium_metabolism_in_dentistry.pdfIn PDF document text
    • https://risixugetiso.weebly.com/uploads/1/3/5/3/135317557/6045190.pdfIn PDF document text
    • https://cdn.sqhk.co/zifakepavax/ji7Umhj/kavofin.pdfIn PDF document text
    • http://my-favshopd.online/6281259902nvu09.pdfIn PDF document text
    • https://febawamowezifu.weebly.com/uploads/1/3/4/5/134594075/joxux.pdfIn PDF document text
    • http://vomuniwawan.iblogger.org/utorrent_android_write_to_sd_card.pdfIn PDF document text
    • http://miwodenexiz.iblogger.org/acidosis_tubular_renal_gpc.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/sojaxub/wefavagixanuliwotefota.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/ashrae_62._2.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/enable_android_apps_on_chromebook_g_suite.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/confisso_chagas_sobrinho.pdfIn PDF document text
    • http://ratadipemor.epizy.com/repupinedumo.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/cognos_report_studio_nested_case_statement.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_off000108f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F2 5396 bytes
SHA-256: 3ad42b77b817dd116898c3ca3570378c86f56918c6dd69304b8dfd09973bd24e
font_01_sfnt_off00011b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6D 11724 bytes
SHA-256: b263c6007c229e87017321f5eaef2950b3ace7d91c17e12aeb8bdf7a3e476d68

Open this report in the interactive analyzer, or submit your own file for analysis.