Malicious PDF — malware analysis report

Static analysis result for SHA-256 505a40e8b1363169…

MALICIOUS

PDF

79.5 KB Created: 2021-04-06 16:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3d05505f90a673a73e444d252d4b2fb9 SHA-1: af9a35c7d917a90f9ef13d64e14174fb511073d0 SHA-256: 505a40e8b13631699e87815d399fb233ae725e16a13c76b560093493c5218525
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/strik?utm_term=meaning+of+value+education+in+hindi PDF link annotation
    • http://guvinesusavilo.iblogger.org/assignment_writing_sample.pdfIn PDF document text
    • http://cleanup-sale.site/gta_lcs_cleo_mod_android_downloadrizvv.pdfIn PDF document text
    • http://vas-rem.ru/78021293078ue3x3.pdfIn PDF document text
    • https://cdn.sqhk.co/salobosemiv/IjdheYE/jbl_stereo_speakers_review.pdfIn PDF document text
    • https://cdn.sqhk.co/gufemazibafi/iiFhhH7/71943759594.pdfIn PDF document text
    • http://prod-fruit.space/tatutijusujekau5zly.pdfIn PDF document text
    • https://cdn.sqhk.co/nanubebebot/fKcPfhi/how_to_make_pixel_art_in_photoshop_7.pdfIn PDF document text
    • http://lnstagramsecurity.net/what_is_a_loop_antenna5n13b.pdfIn PDF document text
    • http://copyrighthelpcentral.com/compton_config_guidegkpzt.pdfIn PDF document text
    • https://cdn.sqhk.co/tufuboloruj/iiIXTgg/vovusibol.pdfIn PDF document text
    • http://distornyup.site/hunger_games_book_series_summaryy6hob.pdfIn PDF document text
    • http://erogan-encolumbia.site/how_to_do_faux_calligraphy_with_a_pencil5a188.pdfIn PDF document text
    • http://remontnatali.ru/269105607184z7ui.pdfIn PDF document text
    • https://cdn.sqhk.co/vilubofi/jgqsZEW/fejixugovatujatawi.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/jemjbgg/virgin_mobile_ksa_customer_care_number.pdfIn PDF document text
    • http://reduslimitaly-official.site/56407594014zx2bo.pdfIn PDF document text
    • http://instasurprise.online/aluminium_fabrication_guidexp3uk.pdfIn PDF document text
    • http://jizefuli.22web.org/how_to_connect_bluetooth_to_pioneer_deh-x6500bt.pdfIn PDF document text
    • https://cdn.sqhk.co/xopuxuvop/p0ggWra/transmission_fluid_change_cost_valvoline.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jikibepedoroto.epizy.com/lejoselorerimazosepux.pdfIn PDF document text
    • http://repuvamiperubo.epizy.com/website_to_get_free_chegg_answers.pdfIn PDF document text
    • http://vesuduw.epizy.com/face_360_porvorim.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_off0000fa45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA45 5076 bytes
SHA-256: e76676573ff6466fef1984dc7db9445c833a3ca58d4da0d8168ebd646f122940
font_01_sfnt_off00010ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA7 10696 bytes
SHA-256: 1ed06b07c88133384c96dc6306fd9fb3301554441a430e3644ea7400c0beab4e

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