Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03e18262e094e60…

MALICIOUS

PDF

84.4 KB Created: 2021-04-08 06:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3a286d89111e679643b55c65657353c6 SHA-1: 10d32f958a1cf412837c75b799ebcd0a3d4ee3e5 SHA-256: a03e18262e094e6065b468ec01176eed691a41402cf55a98b34c0eb43b5be7c2
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document exhibits multiple high-risk heuristics, including a 'Recovery secret / private key request' lure and a 'Password-protected archive handoff' lure, strongly suggesting a phishing or credential harvesting attempt. The ML classifier also flagged it as malicious with high confidence. While no scripts were explicitly extracted, the presence of external URIs and the nature of the lures indicate an attempt to trick the user into revealing sensitive information, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://lozipotod.ru/strik?utm_term=snmp+v2+vs+v3+ports PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414360/normal_60341c422a87d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447888/normal_600bf7ce320c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461763/normal_6052ebe409a8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469353/normal_60688e9f7d253.pdfIn PDF document text
    • http://tezijexipilimo.getenjoyment.net/91493714626.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408586/normal_6005cb2592d84.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481695/normal_5fe35a340feae.pdfIn PDF document text
    • http://boguzimaro.getenjoyment.net/ecology_and_environment_mcq.pdfIn PDF document text
    • http://budokudepa.scienceontheweb.net/52104530461.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413851/normal_606084dd9227b.pdfIn PDF document text
    • http://wimesuzajomos.mypressonline.com/42647708105.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/mvc_interview_questions_and_answers_for_3_years_experience_code_project.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413346/normal_6002d2161fd31.pdfIn PDF document text
    • http://fesotisifofil.mygamesonline.org/53887783675.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wukevivetarapu.myartsonline.com/dream_on_aerosmith_tab.pdfIn PDF document text
    • http://gafodix.myartsonline.com/techniques_of_grammar_translation_method.pdfIn PDF document text
    • http://tosurok.myartsonline.com/speaking_english_test.pdfIn PDF document text
    • http://gibidapasajug.atwebpages.com/aquifer_types.pdfIn PDF document text
    • http://nopawalaxuwaw.onlinewebshop.net/28257393504.pdfIn PDF document text
    • http://lugivodunoxasi.atwebpages.com/acceptance_sampling_in_quality_control_schilling.pdfIn PDF document text
    • http://livirava.atwebpages.com/tagosipikubemuxovon.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_off00010e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E73 5180 bytes
SHA-256: 2a6991856417272a889db327d26197c8beb8c1addae6a5b710747d2462a08db9
font_01_sfnt_off00012006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12006 10452 bytes
SHA-256: bdaa9eb810884ebecc37ed1fb22af6e7538d9daa9df8f6c40e5265c33ca75dd8

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