Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca3463e92488456…

MALICIOUS

PDF

70.0 KB Created: 2021-04-06 21:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5b25a8ef2cedfd0aea381be7311503ba SHA-1: 7754114b5b111c2e2b9e92fb6dbca3d2ad8f538a SHA-256: 4ca3463e924884568691686df0f2f98201956daa4ce6694ab7d8c79e8563c845
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The ML classifier also strongly indicated maliciousness. The document's content, though heavily obfuscated, suggests a lure related to 'audio visual aids pdf download', likely a phishing attempt to trick users into downloading further malicious content. The presence of numerous embedded URLs, some pointing to potentially disposable hosting, further supports this phishing pretext.

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://ambrose.edu/sites/default/files/webform/ginigiwosumomigari.pdf In PDF document text
    • https://www.afscme65.org/system/files/webform/11173368180.pdfIn PDF document text
    • https://aboss.by/sites/default/files/webform/80384466065.pdfIn PDF document text
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/todoxobolukajit.pdfIn PDF document text
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/wajuso.pdfIn PDF document text
    • https://ambrose.edu/sites/default/files/webform/7968200385.pdfIn PDF document text
    • https://ambrose.edu/sites/default/files/webform/kubuxodadiwozubak.pdfIn PDF document text
    • https://www.viachristi.org/sites/default/files/webform/89070061484.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=audio+visual+aids+pdf+downloadPDF link annotation
    • https://minorsoncampus.princeton.edu/system/files/webform/vogifowisawab.pdfIn PDF document text
    • https://www.vub.be/sites/vub/files/webform/rifavuzido.pdfIn PDF document text
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/27560642257.pdfIn PDF document text
    • https://campusrec.princeton.edu/system/files/webform/47045932069.pdfIn PDF document text
    • https://www.vub.be/sites/vub/files/webform/fazarixi.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_off0000d67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67F 5080 bytes
SHA-256: 28bd265ed7a1beb01ab3e6b52df85d94f3b1c9a502afa0a796032a147998bcc7
font_01_sfnt_off0000e7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F6 10428 bytes
SHA-256: fdaeed63512b6a300a0c7d708ba5842d43ed7bcbd0eb40ecb5e79c7d3f15452a

Open this report in the interactive analyzer, or submit your own file for analysis.