Malicious PDF — malware analysis report

Static analysis result for SHA-256 438597d7ab1eb5b3…

MALICIOUS

PDF

88.2 KB Created: 2021-04-09 10:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f45b0ead92f185462086a9bf783ae7dd SHA-1: 9819cbbf0de8cda407d81e2a3603ea73f7126e60 SHA-256: 438597d7ab1eb5b3ebec10b7ad3c61b7e8779efa10ede7164f0e15c70ec14fd2
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 external URIs and is flagged by ML and ClamAV as malicious, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, suggests a lure related to 'communication and types of communication ppt'. The presence of multiple disposable domains and link farm heuristics further supports a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/strik?utm_term=what+is+communication+and+types+of+communication+ppt PDF link annotation
    • https://cdn.sqhk.co/vibisidumes/byjdNrG/nissan_1400_steering_wheel_for_sale_pretoria.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirurafixi/tiehjHa/petasozavujedarereb.pdfIn PDF document text
    • http://on-arenas.com/como_descargar_minecraft_sp_1.5.26r528.pdfIn PDF document text
    • http://tapasin.sportsontheweb.net/jodorelipakosadezugitumap.pdfIn PDF document text
    • http://lnstagramverifiedsbadgesforms.com/wavudosugejokujuwuduwigidpkzej.pdfIn PDF document text
    • https://cdn.sqhk.co/popaxutu/iGhgXij/58810121983.pdfIn PDF document text
    • http://gifavojam.scienceontheweb.net/98799210802.pdfIn PDF document text
    • http://trackengine.host/copy_worksheet_in_excel_2013sfuoh.pdfIn PDF document text
    • https://cdn.sqhk.co/veludewozen/hFqigCx/define_cooped_up_synonym.pdfIn PDF document text
    • http://loveantravel.xyz/845703642848hc97.pdfIn PDF document text
    • http://lerob.info/nevazujuwatabajakv7th.pdfIn PDF document text
    • http://boldly-grow.com/es_4000_manualxrfgx.pdfIn PDF document text
    • http://inglassrus.ru/danby_window_air_conditioner_12000_btu_reviewucc6l.pdfIn PDF document text
    • http://classkaod.ru/64062387247ovjjj.pdfIn PDF document text
    • http://mihetos.xyz/nazaruronexabomufadua2xd6.pdfIn PDF document text
    • http://frontend-developer-azaynullin.site/58357958435325rk.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorikibam/OhbKhep/fleet_battle_mod_apk_2._0._82.pdfIn PDF document text
    • http://bet-info.ru/87111836245x9tz2.pdfIn PDF document text
    • http://kpupnov.pro/wapakapw7zrv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2301a250-5910-4d30-8806-8e5817de53db/movined.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d79c2c79-08d7-4128-8213-91ab97eb8a4a/where_to_donate_used_furniture_in_durham_region.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc83c362-0688-45ff-8e51-4d12e08b5bcb/81949712591.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e385872f-66f9-464c-b80d-d070f7c342f8/craftsman_3x21_belt_sander_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E52 5264 bytes
SHA-256: e915840e2bf1de849b425d3c1141ec02e57d7e8292641ec8c5432949e197fd8c
font_01_sfnt_off00012024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12024 10692 bytes
SHA-256: 50c48896f480d40545d7c8a902cfafab184cedfea1b3771a338cc046b3bfc4f8
font_02_sfnt_off0001448d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1448D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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