Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d588dcebf1a59e…

MALICIOUS

PDF

67.1 KB Created: 2021-02-27 07:38:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 7e6d3cccf302709ed066a084e30555ee SHA-1: d135ea0cb8e7c28c64f6c40c75c417f0436588c6 SHA-256: c8d588dcebf1a59e01a7b6935d8fac4013b18e59d59fba919ccd51138a153832
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that redirect to a disposable hosting domain, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to educational content, likely intended to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/wix?keyword=sadlier+oxford+vocab+level+d+unit+13+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482403/normal_60035a127605f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421764/normal_60199979328eb.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/robefepipizumalozakokived.pdfIn PDF document text
    • http://ighelperscenter.com/mexofurijapafaivw54.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/2932876056.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380887/normal_5ff621c6ce607.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446045/normal_5ffea3cb9b754.pdfIn PDF document text
    • http://pagavopalubutu.scienceontheweb.net/pavizewolulipuzesugobowav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422382/normal_5fd1b50f6e34e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pabewuvuxaf.onlinewebshop.net/niworejeva.pdfIn PDF document text
    • http://dudakesiburegig.rf.gd/4_areas_of_differentiated_instruction.pdfIn PDF document text
    • http://lafowozutoxoj.epizy.com/black_and_decker_extendable_electric_hedge_trimmer.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/48617651962.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/despacito_ringtone_instrumental_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/panasonic_model_kx_tga410c_manual.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_off0000c962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC962 5692 bytes
SHA-256: b30827c7482c95d5826283eb23a469b465acc127f9233c7a3e4812d8cdab888f
font_01_sfnt_off0000dcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF0 10016 bytes
SHA-256: 48ed289e551db9f66e4cd94d29e73c43b223798358ff273e2ca7a15599a1b9b7

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