Malicious PDF — malware analysis report

Static analysis result for SHA-256 e36f0db6874e27f9…

MALICIOUS

PDF

80.2 KB Created: 2021-03-17 10:46:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 55a379bb372cc196d2dbc0c385747032 SHA-1: 588f67759607a67ce5eaecc6b38d198a0afa21f1 SHA-256: e36f0db6874e27f97e59dd0851bc754ebd2cc64a48978f491edcc8f6eb363cf2
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were extracted, the PDF structure itself is designed to facilitate malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.NoRobot072134-9875396-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.NoRobot072134-9875396-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://dafemum.ru/123?utm_term=billie+eilish+lovely+instrumental In PDF document text
    • http://fezelaradelemuj.22web.org/microsoft_authenticator_app_minimum_android_version.pdfIn PDF document text
    • http://supportcopyright.net/87263921538l3wld.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423428/normal_604d8d252ce4e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367905/normal_60021c9fa63eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476936/normal_600873f43907d.pdfIn PDF document text
    • https://cdn.sqhk.co/buzomesil/YCgjgg3/nepefosib.pdfIn PDF document text
    • http://znasila.ru/hoover_carpet_shampooer_not_picking_up_waterulv4u.pdfIn PDF document text
    • http://shopmzm.site/sepuzumifakazoghewti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444123/normal_5fce60440aa8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379236/normal_5ff228127212a.pdfIn PDF document text
    • http://heliusdesign.ru/monkey_business_movie_thora_birch8z4q3.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwopazeg/eHhfXL4/catalytic_reforming_in_petroleum_refining.pdfIn PDF document text
    • http://eurostore.info/mayabazar_telugu_movie_video_songs_freez2o78.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_ea062d9f4ab246468cebfbc78397ffb7.pdf?index=trueIn PDF document text
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_459a7bba40e1466c930c127d0789a8b4.pdf?index=trueIn PDF document text
    • https://ffb80149-315c-4936-8637-e87477b606fc.filesusr.com/ugd/e7410d_6d8a79187b5c4ad993d84eb777db7190.pdf?index=trueIn PDF document text
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_81f78a7a01014deb872a858d9b17b870.pdf?index=trueIn PDF document text
    • http://robajev.rf.gd/67911858454.pdfIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_1f943b5a83ad4ea09438480534b6828a.pdf?index=trueIn PDF document text
    • https://84d655c4-d84a-4a0c-9c32-0387925bd622.filesusr.com/ugd/6233da_2d2bd0297667441299fca7bf7763ccfa.pdf?index=trueIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_5fa3ac4e86fc4c1287f1d915d53279e7.pdf?index=trueIn PDF document text
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_36708d2ed9d34b808e3955732cb09f33.pdf?index=trueIn PDF document text
    • http://sobegomogi.rf.gd/tutaji.pdfIn PDF document text
    • http://bofiragomux.rf.gd/99007761406.pdfIn PDF document text
    • http://nadilafirot.rf.gd/78044103129.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_off0000fa4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4B 5136 bytes
SHA-256: 5d710bc7af8c5520d9fa339bb2314eaf86cf847a92b3e313ac5db44b0ccbcc7d
font_01_sfnt_off00010b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9B 11608 bytes
SHA-256: 841248a7b2bdc9fb8ad81fb30782cd46624fbf43d8937c1d87c163bec10ee26a