Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4fe728bc4fc9e4e…

MALICIOUS

PDF

70.4 KB Created: 2021-04-07 15:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 688060adf3f4cb32ba38fc3a19f7a5f4 SHA-1: c95863433e25008e61aed35d5f9e56836af61600 SHA-256: f4fe728bc4fc9e4e7aa25f0515f309e48ab21e9c934ce8e80b64d651a722e650
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm designed for SEO manipulation, likely to redirect users to malicious sites. The presence of embedded URLs suggests an attempt to direct users to external resources, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/strik?utm_term=how+to+reset+fx-115es+plus PDF link annotation
    • http://duwinijuj.mypressonline.com/nursery_school_design.pdfIn PDF document text
    • http://kalidejomepajo.scienceontheweb.net/how_to_fill_out_return_of_service_form.pdfIn PDF document text
    • http://wativeb.mypressonline.com/btc_first_semester_syllabus_2020.pdfIn PDF document text
    • http://lagejarejitog.mypressonline.com/bokigawiboxomuwuvux.pdfIn PDF document text
    • http://fuvagezilavez.mygamesonline.org/24419511967.pdfIn PDF document text
    • http://wivikaxebox.medianewsonline.com/68959158763.pdfIn PDF document text
    • http://halfraire.xyz/42613290488nslia.pdfIn PDF document text
    • http://gesetaxoxu.sportsontheweb.net/21587710684.pdfIn PDF document text
    • http://hamsterbig.com/how_to_choose_butter_lettuceb0o8b.pdfIn PDF document text
    • http://kurs1.xyz/56816074647xgs82.pdfIn PDF document text
    • http://vorgazme.com/tafsir_ibn_kathir_arabic_downloadqfdws.pdfIn PDF document text
    • http://xufopizaxeto.medianewsonline.com/aula_internacional_1_ejercicios.pdfIn PDF document text
    • http://wovuwukotuvoxi.mygamesonline.org/sql_server_2020_administrator_s_guide_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kosejoviwo.epizy.com/word_meaning_in_urdu.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/javowe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dffc66e-b6dc-4232-aa80-2596cbca6623/a1c_vs_blood_sugar_levels.pdfIn PDF document text
    • http://jogekofasi.rf.gd/sukodunosufutolemejebugaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4d18104-1aef-44a6-b263-42b23bc5b67b/40445082948.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/tapegisinew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b265dd8-0fba-4ae0-a509-3087d5bf5809/kowukor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d707f28c-5ef7-492c-acaf-554fc5c89467/peponofijopetuwujigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/627d7a17-8c1c-418f-a0f9-9cfb1f89e18c/vixugida.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_off0000d64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64F 5016 bytes
SHA-256: 10c76032f3f2f9a6ace296a65f552b477bd4655ae3094193c166b54803736685
font_01_sfnt_off0000e798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE798 10880 bytes
SHA-256: 236638247e0cec049941a5afa278320d7e9a4a067d5d1a8b9cdc5671f248a2c2

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