Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cdf3ef2f12be593…

MALICIOUS

PDF

73.8 KB Created: 2021-03-16 07:49:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27bcefbe94dd1ab926ed40e328808470 SHA-1: 79acebb4953513e4301e480918e185435a286042 SHA-256: 2cdf3ef2f12be593712ae6a8120d7c79e4f1fbd740344be2ac1c91d9cfc349da
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains an embedded URL pointing to a suspicious domain, which is likely used to deliver a malicious payload or conduct phishing. The PDF structure and embedded content suggest it's designed to trick users into visiting this external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/aws?utm_term=preposition+test+printable
    • https://cdn-cms.f-static.net/uploads/4464542/normal_604cde5b61efe.pdf
    • https://cdn-cms.f-static.net/uploads/4454422/normal_601664f35178e.pdf
    • http://br1.red/does_mrs_coulter_know_lyra_is_her_daughter81a2q.pdf
    • http://vomamafawib.scienceontheweb.net/98006653288.pdf
    • http://oyuncuxx.com/wupujenbpxfv.pdf
    • http://jobauthor.online/46932250308d5ppt.pdf
    • http://lagulesuko.medianewsonline.com/57267885180.pdf
    • http://lalat.space/14000745745p63kt.pdf
    • http://trenolgia.buzz/polyvine_decorators_varnish_safety_data_sheet1hsd5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_7a3fe49f2b37463193f0af12b626c1d9.pdf?index=true
    • http://visugog.myartsonline.com/65105903901.pdf
    • http://tagitefidunun.epizy.com/hubspot_inbound_marketing_certification_exam_answers_2018.pdf
    • http://juwijez.rf.gd/doodle_sheet_set.pdf
    • http://jogekofasi.rf.gd/is_wes_legit.pdf
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_9bbf75407ad44131981272b5ab863e40.pdf?index=true
    • http://ruzoguniwu.epizy.com/zedonideda.pdf
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_45901c7689b945e4839fff81f75bdd1a.pdf?index=true
    • https://89d37d93-eaf9-4fc7-8d5e-07438b8f18e7.filesusr.com/ugd/e80f4c_80985c3e952b4422a4279b4af1958913.pdf?index=true
    • http://koxikid.epizy.com/how_do_i_contact_child_support_in_texas.pdf
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_71a9fd8209934c909d623311db9e1195.pdf?index=true
    • http://kimoviranonaf.onlinewebshop.net/aviation_boatswains_mate_salary_in_india.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3f7.bin
64f21e28201aeada731b72508487676ed53336e7567030ac66ec7a999e7a95d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F7 4956 bytes
font_01_sfnt_off0000f4d4.bin
d3c0881ebcb0f9f39a863d485c69e650f2c3689cb934dbf965bb65833d5f6053		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D4 11012 bytes

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