Malicious PDF — malware analysis report

Static analysis result for SHA-256 a56b2dd2e153b849…

MALICIOUS

PDF

77.6 KB Created: 2021-03-22 05:03:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 311bd0c690f0e779161e10c74802df15 SHA-1: 17079971da05660e16be94de4cc20241d79d95eb SHA-256: a56b2dd2e153b84938b0ef4599ffff79cf86634e83f438c4a0080c1307ddf41a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://kuzutuzo.ru/strik?utm_term=how+to+be+a+special+education+aide PDF link annotation
    • http://alania365.ru/world_war_z_cross_platform_ps4_pct1jeo.pdfIn PDF document text
    • http://waranijovuv.sportsontheweb.net/the_woman_in_the_window.pdfIn PDF document text
    • http://bumomuvo.iblogger.org/simile_worksheets_grade_2_tagalog.pdfIn PDF document text
    • https://dorubirema.weebly.com/uploads/1/3/4/3/134317311/2a5a45444ebaa.pdfIn PDF document text
    • http://nadahul.ru/lowovalamijez8umfv.pdfIn PDF document text
    • http://nufivuzelikonax.getenjoyment.net/22411096936.pdfIn PDF document text
    • https://bolafuba.weebly.com/uploads/1/3/4/6/134668532/tuseruloti.pdfIn PDF document text
    • http://triple-doska4.club/93529503111md1v8.pdfIn PDF document text
    • http://slimitalia.space/install_bag_on_ridgid_shop_vacmhblh.pdfIn PDF document text
    • http://vavoferidedodif.66ghz.com/lightroom_apk_upgrade.pdfIn PDF document text
    • https://makezuxakoje.weebly.com/uploads/1/3/0/7/130739015/wugunujom-tikiru-narokomobipu.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/0CHcibM/lusafos.pdfIn PDF document text
    • https://cdn.sqhk.co/lidupusumoj/YAzsGgf/vikuwewopimubaxexabed.pdfIn PDF document text
    • http://kakafeg.scienceontheweb.net/point_io_1734_aent_manual_espaol.pdfIn PDF document text
    • https://menebunokusup.weebly.com/uploads/1/3/4/5/134588819/savuluniwipisenojo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tevefetilojas.atwebpages.com/65016601758.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1c0a3bc-5e90-48bb-b64b-2a8681d8715b/how_to_turn_off_hourly_beep_on_baby_g_shock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8eeb91b-782c-4075-922c-71a8c393d403/rexaxodenulozukisuli.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_off0000f21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21A 5164 bytes
SHA-256: 96c6fd97ada64c62a3939cbc861799c7a0854e324b047611e54d74f732b2ee46
font_01_sfnt_off000103c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C4 11008 bytes
SHA-256: 00b5c9d531684ed38309731e175467fb4caddf554896b711e384a06ab6aba3e7

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