PDF malware analysis — malicious · 54cf239f4d4d28fd

MALICIOUS

PDF

88.8 KB Created: 2021-03-17 11:51:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: 436e42d008ff744e6b3e63d609fc1c43 SHA-1: b12713ef55d1a05148f73827550ca2503a3540d5 SHA-256: 54cf239f4d4d28fd54ff1b1a0140f133306e2c0f33238853c90e9e6823b6c93c

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, suggests a lure related to 'Barthel index score pdf', likely to trick users into clicking on the malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9994

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/award?keyword=barthel+index+score+pdf PDF link annotation
- http://xteenware.online/jilujisc7oio.pdfIn PDF document text
- http://idealslimitaly-ufficiale.site/45230362749cx7pb.pdfIn PDF document text
- http://cashfree.store/count_zero_summaryx478l.pdfIn PDF document text
- http://center-san.ru/15346788330b9lff.pdfIn PDF document text
- http://2022god.com/jarazarusugo9cs4d.pdfIn PDF document text
- http://bachanalytics.com/xetawerakulikawuwilyppd9.pdfIn PDF document text
- http://1yamal.space/guess_the_tamil_movie_game_in_instagramj7trz.pdfIn PDF document text
- http://likelid.xyz/football_manager_handler_2015_system_requirementsqdzw9.pdfIn PDF document text
- http://iranomics.com/el_diario_de_greg_2_pelicula_completa_en_espaol_repelis1rsn9.pdfIn PDF document text
- http://sberbank.services/get_police_report_chicago87hji.pdfIn PDF document text
- http://esagafow.fun/kenwood_dpx501bt_delete_bluetooth_devicejq18j.pdfIn PDF document text
- http://yoganchik.space/construction_europenne_cm2rph1m.pdfIn PDF document text
- http://strita.space/environment_friendly_powerpoint_templatesexaxu.pdfIn PDF document text
- http://kamini33.ru/3328574409k6q8d.pdfIn PDF document text
- http://copyrightshelpscenters.com/html_css_link_to_same_pagevwqdg.pdfIn PDF document text
- http://policyhelpcenter.com/rilagirokulu7tg.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/e6b4fb90-a7a5-4bdc-86b3-ef3fd4e57049/does_toshiba_smart_tv_have_android.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/ad2d8625-d07b-4764-a3da-553b59f303d1/arkansas_driver_license_test_quizlet.pdfIn PDF document text
- https://104e3d6a-8609-4a5f-ba89-88df40aeb326.filesusr.com/ugd/3cb22f_95222512bec14f1d843be39367025114.pdf?index=trueIn PDF document text
- https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_88e815d5dd05449784c79fca4793ace6.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/343c32ca-8d14-464a-998c-755b81ca99ac/juvutaluduxozeramef.pdfIn PDF document text
- https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_27509251986b43caaea235d8adb57be5.pdf?index=trueIn 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.

Filename	Kind	Source	Size
`font_00_sfnt_off00010f0b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F0B	5148 bytes
SHA-256: `465be77d2fc75d039a62cea8845449d391a4d8cc407bd2e8339e5f7283a53e42`
`font_01_sfnt_off0001207f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1207F	11572 bytes
SHA-256: `ba4ff33ae63e50ba9880c01b40c1790bd64bd99c95a911e103f853d1aab003c6`
`font_02_sfnt_off000147be.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x147BE	4324 bytes
SHA-256: `0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333`

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