Malicious PDF — malware analysis report

Static analysis result for SHA-256 0555e9650a9ad798…

MALICIOUS

PDF

90.0 KB Created: 2021-03-25 00:34:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 28584aa7091b08095878fe491f3c50e8 SHA-1: 79b5552ccbc5860365ee7824e1ab5bb0f8f92c18 SHA-256: 0555e9650a9ad7981744c1c584371c7d471d47770af0f2c98cfe655c46311be4
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, with a significant portion hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/award?keyword=cancer+de+piel+en+costa+rica+pdf PDF link annotation
    • http://jajuviramigawo.medianewsonline.com/4598266483.pdfIn PDF document text
    • http://braco.ru/8993862609biuhi.pdfIn PDF document text
    • http://fukuzowi.sportsontheweb.net/bnf_73_free_download.pdfIn PDF document text
    • http://uscreditmonitoring.info/domain_of_logarithmic_functions_worksheeta5aft.pdfIn PDF document text
    • http://clobuss.ru/stochastic_approximation_and_recursive_estimationjnxsb.pdfIn PDF document text
    • http://wutoxurusot.iblogger.org/dewalalonunopuguzam.pdfIn PDF document text
    • http://wigemefigiw.mygamesonline.org/3331698296.pdfIn PDF document text
    • http://zuduwipakeboku.iblogger.org/relation_and_function_practice_worksheet.pdfIn PDF document text
    • http://nutristrike-shop.ru/agricultural_vehicle_exemption_formrioc6.pdfIn PDF document text
    • http://fb-copyright-help-from.com/ben_ten_alien_force_apk74hq1.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://s3.amazonaws.com/gavobawum/car_valuation_report.pdfIn PDF document text
    • http://nizipere.epizy.com/accelerator_theory_of_investment.pdfIn PDF document text
    • http://welidigukiru.epizy.com/banerji_protocol_book_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/music_video_app_for_pc.pdfIn PDF document text
    • http://kadekosaraf.epizy.com/kivimutatefapu.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/garstang_market_reports.pdfIn PDF document text
    • http://lenixad.epizy.com/fractured_minds_ps4_trophy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/doxology_music_sheet.pdfIn PDF document text
    • http://fuvafajof.rf.gd/journey_to_the_west_movie_download_in_english.pdfIn PDF document text
    • http://jigemoli.epizy.com/24746919422.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_off000112c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C0 4960 bytes
SHA-256: e97de285507c54b6232bd24cd1c19d96b99045edce6361cd50ff7c67c1826faa
font_01_sfnt_off000123a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A5 11976 bytes
SHA-256: e673494df031d9264d37da8dff2d077170a376c2a4f7107cf5c4268d8e6be25e
font_02_sfnt_off00014afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AFE 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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