Malicious PDF — malware analysis report

Static analysis result for SHA-256 d59655ad5756a613…

MALICIOUS

PDF

81.2 KB Created: 2021-04-25 23:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c0b5817b86e1bd5ba48af7fc1ada9dbd SHA-1: 22a10f0950fb538f8e164e11e5664123cbe30ea3 SHA-256: d59655ad5756a613a505c1b37628a83b60ddce6200cb4e3a25a211fbd2021e2c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://jacksth.ru/strik?utm_term=introduction+to+computer+security+goodrich+pdf+download PDF link annotation
    • http://medyayazilimtr.com/1234740812bdpy8.pdfIn PDF document text
    • http://originalhallyu.com/arkansas_commercial_drivers_license_practice_test8k1cl.pdfIn PDF document text
    • http://nyvelsets.online/elektrometal_plus_metal_prices_georgian73qd.pdfIn PDF document text
    • http://mazers.fun/samsung_dmt400rhs_error_codesgmyxe.pdfIn PDF document text
    • http://usacreditscore.info/nintex_site_workflow_example7cdqa.pdfIn PDF document text
    • http://evgeniy-semenenko.ru/the_oxygen_thief_summaryrllmh.pdfIn PDF document text
    • http://choosenews.space/38957565442p1vkf.pdfIn PDF document text
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/red_battery_light_flashing_on_roombaf4rf3.pdfIn PDF document text
    • http://precabinets.xyz/anomalias_congenitas_del_aparato_reproductor_femenino9vn8y.pdfIn PDF document text
    • http://alfa-quest.ru/fokuzexokuzexigokipiwawojdhxu6.pdfIn PDF document text
    • http://8bitbeardsco.com/heroes_of_the_feywild_downloadmwef7.pdfIn PDF document text
    • http://vitrinachel.ru/netherland_dwarf_color_breeding_guidebj214.pdfIn PDF document text
    • http://ru-order-687646765445.art/maytag_bravos_xl_dryer_door_reversal_instructionswp792.pdfIn PDF document text
    • http://kernig.pro/beautiful_disaster_lyrics_jonhenpj.pdfIn PDF document text
    • http://healingtunes.ru/vifilisixadakufexaw3rmkz.pdfIn PDF document text
    • http://subonus.ru/what_is_the_urdu_meaning_of_tropic_of_cancerdpuyf.pdfIn PDF document text
    • http://sfhgfje5df.xyz/marvel_cinematic_universe_movies_orderugael.pdfIn PDF document text
    • http://rankingcoach-seo.com/xopuruzopulipuribag8kx7j.pdfIn PDF document text
    • http://contact-git.top/marvel_future_fight_apkpure3z6t8.pdfIn PDF document text
    • http://leopards.space/loan_interest_calculator_excel_sheet7xgvk.pdfIn PDF document text
    • http://lawyer-consult.ru/how_would_you_describe_the_play_macbethss019.pdfIn PDF document text
    • http://marafonsport.site/42361206501d61xg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_503dc78b50ea4a87a321c5a299491a0d.pdf?index=trueIn PDF document text
    • https://6f81cef9-66a2-447d-9e1d-4c0427ef15c5.filesusr.com/ugd/4d935e_2816b3be2ea34855ac46f487391db8b3.pdf?index=trueIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_00a7742a78a747dca19e06295412d62f.pdf?index=trueIn PDF document text
    • https://e905a76e-7bc1-418c-be29-e8eda1603e86.filesusr.com/ugd/3fb32a_273ef177ee384a2bbb64e4c9b0c508c6.pdf?index=trueIn PDF document text
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_325d642163644d45a891420098d1190c.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD94 5700 bytes
SHA-256: 5c5b2071bd6d69bada4349c68e07a7e6a5d33d1c0f1ac5fc82b2915f427eb982
font_01_sfnt_off000110e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E7 11008 bytes
SHA-256: ad529b47691ffb9ff5c2d08e0800d735770ebe46ac9cadf1555a94353be457b9