Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf38f43e81aa2f0f…

MALICIOUS

PDF

87.4 KB Created: 2021-04-04 15:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: f43f6ce4e45a155b5b1b465f9a2a7b30 SHA-1: 88ff6e1ba6faf1f9d9a6ac699ce4b4e368f4274b SHA-256: cf38f43e81aa2f0f9e40bea7eca4d3c6b1d14dd21ec7de38879ecf8e256cfa14
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, with at least one heuristic identifying it as a link farm on disposable hosting. The presence of external URIs and the overall structure suggest the PDF is intended to redirect users to malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/wix?keyword=which+is+not+a+question+of+value+speech PDF link annotation
    • http://lollipopa.online/school_calendar_template_google_sheetsnejxn.pdfIn PDF document text
    • http://mebevevi.mywebcommunity.org/55772943842.pdfIn PDF document text
    • http://italia-doc.fun/oceanhorn_walkthrough_ignx7qyi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495391/normal_600682e49a5e3.pdfIn PDF document text
    • http://ig-soft-team.com/accident_reporting_in_care_homesie9p0.pdfIn PDF document text
    • http://tufuwavaziga.mygamesonline.org/causas_del_autismo_en_nios.pdfIn PDF document text
    • http://bukapim.mywebcommunity.org/99118629674.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451375/normal_604cab1513c2c.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/can_spells_crit_dnd.pdfIn PDF document text
    • http://lulilafemavivog.mygamesonline.org/java_projects_for_beginners_download.pdfIn PDF document text
    • http://solusaxisabo.scienceontheweb.net/bolt_tightening_torque_standard.pdfIn PDF document text
    • http://balifruit.com/kajupebexilonimelqtjki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372105/normal_5fe3d92c4a15f.pdfIn PDF document text
    • http://white-x.fun/893563844356pobx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuvozakini.epizy.com/spinal_cord_injury_2020.pdfIn PDF document text
    • http://laxolagodofomug.onlinewebshop.net/apostila_auditor_fiscal_sefaz.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/rigosefifiv.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/aspire_8._5_software_free.pdfIn PDF document text
    • http://pizitibasowu.atwebpages.com/57503973198.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/55706277377.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/autocad_plant_3d_2019_free_download_full_version.pdfIn PDF document text
    • http://wapofele.epizy.com/how_to_do_an_analysis_of_a_poem.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/30863665969.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_off000118db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DB 5204 bytes
SHA-256: 138599593448710c6dd41b69372acdcdbdbd2d51186dbc6df3942ed2ea3deabe
font_01_sfnt_off00012ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB6 10628 bytes
SHA-256: dbb875c74c1996baa8b24f3c94b758b372f401526c184371d8b1d6ffccb024c1

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