Malicious PDF — malware analysis report

Static analysis result for SHA-256 724ecae1e9e4fc9d…

MALICIOUS

PDF

77.0 KB Created: 2021-04-02 00:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d18766bfb5fa8647c536a0bd11d125fd SHA-1: b1e4a6b79bda5efa323724627378dde9a4582097 SHA-256: 724ecae1e9e4fc9df4c402fdaa6fafcf7d0f7d19ee3d183b2f95e374fbbecafd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, many of which are flagged as link farms. The document body, though partially obfuscated, suggests a lure related to 'Annamalai university exam application form 2019'. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution via these external links.

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://jumiwimov.ru/123?utm_term=annamalai+university+exam+application+form+2019 PDF link annotation
    • http://lnstagramcopyrigtservice.com/knights_templar_and_the_holy_grail_historyp6ogi.pdfIn PDF document text
    • http://guitar.su/king_of_avalon_gift_codes_august_2016eoje.pdfIn PDF document text
    • http://sitajejo.22web.org/the_abominable_bride_720p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_60233b59bf7e7.pdfIn PDF document text
    • http://kamodokawi.iblogger.org/revista_casa_viva_mexico.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368751/normal_6031ff4dc2551.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458412/normal_605975d9b07fa.pdfIn PDF document text
    • http://donuliwobem.iblogger.org/cellular_respiration_diagram_answer_key.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_606064e07d2c0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://miwilodugifi.rf.gd/50098533611.pdfIn PDF document text
    • http://lobunuwofapow.rf.gd/51516537499.pdfIn PDF document text
    • http://sofirenapirovo.rf.gd/dibumajinaku.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/77392899918.pdfIn PDF document text
    • http://deravamosu.rf.gd/gudumoloju.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/16651932871.pdfIn PDF document text
    • http://fidusigugowubo.epizy.com/design_templates_powerpoint_2010_free.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_off0000ed2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2B 5860 bytes
SHA-256: 356266a492b2707377f48d502bab00c037439ac044e699365292e375f0709fd3
font_01_sfnt_off0001011f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011F 11072 bytes
SHA-256: 01a538254f6c9fcd9896a16e82879e47b4d0358a2515ab2e9cf26c3ffbe3557e

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