Malicious PDF — malware analysis report

Static analysis result for SHA-256 c789b8ebf48b26c3…

MALICIOUS

PDF

78.4 KB Created: 2021-03-23 07:58:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6184efaa8c596b8e276fa5c4126074f SHA-1: 993917b0b91e7c3e3deab86f6f7a9adfa9300055 SHA-256: c789b8ebf48b26c308a3bf917430248c55e96b44d97cd045f3a8c3bc137dfb03
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a link farm designed for phishing or malware delivery. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically.

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/strik?utm_term=rife+consolidated+annotated+frequency+list
    • https://cdn.sqhk.co/toledexipez/iczhJhf/real_followers_for_instagram_free_app.pdf
    • https://static.s123-cdn-static.com/uploads/4380675/normal_5fe4d63b35d90.pdf
    • http://sanatoriy-izumrudny.ru/confederacy_of_dunces_plot_synopsisrnbup.pdf
    • http://drenajkrasnodar.ru/whitney_houston_brandy_cinderella_movieqdjva.pdf
    • http://brumbum3.xyz/suluvifikemimakasojigjs1rc.pdf
    • https://cdn-cms.f-static.net/uploads/4445864/normal_5fe6379d50e95.pdf
    • https://cdn.sqhk.co/futipujorup/jihOxAI/quiz_logo_game_answers_level_france_4.pdf
    • https://cdn-cms.f-static.net/uploads/4403129/normal_6018a3504eecf.pdf
    • https://static.s123-cdn-static.com/uploads/4413842/normal_5feb446f1eec8.pdf
    • https://cdn.sqhk.co/suwezuzifu/dlhdgic/front_license_plate_in_california.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/180f04cc-aaea-419e-86b8-ae953fb47372/82654569840.pdf
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_d8eba93ac0fd48858100794316113f22.pdf?index=true
    • https://uploads.strikinglycdn.com/files/53440abd-408a-4770-9e67-0edf98e897cd/91419552304.pdf
    • https://uploads.strikinglycdn.com/files/e0989627-7a7e-4333-a966-8c8a8ffb2f7b/xufipogade.pdf
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_957d7975abe74a47b57879349f9b26b9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f3667766-a991-4f1e-9589-d71c77370670/banufidise.pdf
    • https://uploads.strikinglycdn.com/files/a49cf797-2586-4a68-90cc-7df221b88512/what_are_normal_ekg_test_results.pdf
    • https://c370dac7-4848-4fa0-a6df-94361299e8ba.filesusr.com/ugd/fa6303_cf6c1c53f9c94e38a1a673af9c42087e.pdf?index=true
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_7ba0f6cc761746c39db544606c04fe56.pdf?index=true
    • https://e33362eb-94ba-4427-a888-6f4863169a18.filesusr.com/ugd/36ce96_b949cb652eaf4a028cb6c309f6b85302.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7a7.bin
91b9fb594d55926780fcd21f872f9126422f926497490684d32a195aacca2004		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A7 5248 bytes
font_01_sfnt_off0001099d.bin
c09310da0521b91a5d7ce3d6296a33bd0f3b050b9b818e6d0035b6799bff22f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1099D 10200 bytes

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