Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4d0a27e97dd8ad…

MALICIOUS

PDF

74.9 KB Created: 2021-04-06 00:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: bee4c76c300e4a58d097e8c05d9e1c70 SHA-1: 474f010cbb1510d64d1e8e22a75fc6872906aee5 SHA-256: ba4d0a27e97dd8adeb63122feefceece19d2eda72ec2a67b972214c63d40c7fc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple external links, with a high concentration on disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded URLs point to suspicious domains, including one that appears to be a keyword-based redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://midufefew.ru/wix?keyword=summer+of+the+monkeys+chapter+summary PDF link annotation
    • https://cdn.sqhk.co/muzedikerum/hhGrjh3/9138030087.pdfIn PDF document text
    • https://cdn.sqhk.co/wamitavixitu/hAYWnV1/puxeraban.pdfIn PDF document text
    • https://cdn.sqhk.co/rafumufo/hgIhieD/ike_s_love_and_sandwiches_mesa.pdfIn PDF document text
    • http://tusiteguluvora.getenjoyment.net/cellular_organization_notes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459059/normal_60255a4a18317.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424011/normal_5fe62a08208cd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://batawovajupofu.rf.gd/always_korean_movie_in_english.pdfIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_b94011043ed3421e9e224d71950444a6.pdf?index=trueIn PDF document text
    • http://nujilexulajuwup.atwebpages.com/devaxejivamobiwowugepo.pdfIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_391fed5f6220493b8c3748503a36f946.pdf?index=trueIn PDF document text
    • https://19527f6f-7821-4b33-8e58-d909ab9a203f.filesusr.com/ugd/b18fc6_803fa137aa62428e9abb24f0641d7665.pdf?index=trueIn PDF document text
    • https://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_7e1c82e9982d4856b39572f5ef41b459.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/fesobotalobupofevaxet.pdfIn PDF document text
    • https://9df6e0af-a028-4e88-91ba-61a1b37318d5.filesusr.com/ugd/7c1f05_62718aa1fa6f417d9326d248f727cfc3.pdf?index=trueIn PDF document text
    • http://dafuwinev.myartsonline.com/practical_meta_analysis_applied_social_research_methods.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/epson_workforce_wf_2630_cambio_cartucce.pdfIn PDF document text
    • http://xajizufobuvofo.epizy.com/31776051378.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_off0000e47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47C 5492 bytes
SHA-256: 98a9ba428822b96d9370ff16f518a366c924b4bfd053d4a97bbbc3a6bf02abe3
font_01_sfnt_off0000f70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70D 11040 bytes
SHA-256: 5459e05e662ec9addbdc3f1e92451af53e37cffb8a95028a7f839161dacea1a0

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