Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d1805e346e154f…

MALICIOUS

PDF

74.6 KB Created: 2021-09-29 06:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f7e4bc07407a1f3cdf57aa4d82b98a39 SHA-1: a787ca0f3b363f0b4d3bfd5e4425b0c9e232f222 SHA-256: b4d1805e346e154fcdb4ed064293793e3992b5cc10ab52f8707835251cff984a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ketchas.ru/uplcv?utm_term=everything+everything+book+free PDF link annotation
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/40090882990.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/fukiza.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/guketofitefod.pdfIn PDF document text
    • http://simonide.org/userfiles/file/kigikivemirixudulopewede.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/10259504146.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/jademerawizufal.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/52821321305.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/47826071183.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/tutegenapari.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/32254993051.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/65972615094.pdfIn PDF document text
    • https://webmenuplus.com/images/file/gikabe.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/letopo.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/80977935270.pdfIn PDF document text
    • https://wonkingchina.com/d/files/xatibemiferubuja.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/24415043163.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/51250727665.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/47719822001.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/27/25764540367.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/padozewijegutigu.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE1 10512 bytes
SHA-256: 83589282a3693ddbe832a82c5a2140e5c36c942b195b98ff0756fff805ab6171
font_01_sfnt_off0000d3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BC 18776 bytes
SHA-256: 3e25c85f30ddfe53a1106ed060541676480447c8a8534b53158422c69ee4a9dc
font_02_sfnt_off000104c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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