Malicious PDF — malware analysis report

Static analysis result for SHA-256 b29fefd32283616c…

MALICIOUS

PDF

71.8 KB Created: 2021-03-20 16:25:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d48a8181d6516f5ea623df55ed2d672a SHA-1: d78ec28be4ed918444b551bdc66dcf5c69f2f3d7 SHA-256: b29fefd32283616c6948ed889ba72d012fac384ad9012e19c701f4ee568466e8
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, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme to deliver malicious content. The presence of external URIs and the ML_NYX_PDF_MALICIOUS heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://druttle.ru/strik?utm_term=why+is+my+monster+speaker+not+charging
    • http://logmeinnow.xyz/shoulder_muscle_building_exercises_without_weightsp3q2v.pdf
    • http://islta.fun/59399849799dwnx5.pdf
    • http://rotiwopofeze.mywebcommunity.org/basic_house_wiring_diagram.pdf
    • http://fruit-italy.space/xovivovodumotexoxanbyxku.pdf
    • http://nojuror.22web.org/british_council_ielts_books_free_download.pdf
    • http://idealica-it.website/3d_animated_heart_giftu292.pdf
    • http://choosenews.space/fekukalojukagutewape53rh.pdf
    • http://yachts-4-sale.com/daximimajeloreredogitds1aj.pdf
    • http://afracheat9.xyz/kerboodle_answers_chemistry_aqa_a_level4e3b4.pdf
    • http://lofitner.buzz/jay_z_magna_carta_holy_grail_album_cover4d7so.pdf
    • http://changepass.online/how_to_create_a_form_in_word_2016_mac6gmj0.pdf
    • http://quickpapp.online/america_history_and_life_with_full_textayz3j.pdf
    • http://mosasekoz.22web.org/skype_apk_for_android_tablet.pdf
    • http://iclod.tech/95760162975tfen5.pdf
    • http://theharaka.online/zifanibinenejahfr2d.pdf
    • http://stroymarketmetal.ru/793415132303j3y3.pdf
    • http://usesucre.pro/el_pollo_loco_coleslaw_nutrition_facts74jij.pdf
    • http://hallop.xyz/viper_3305v_shock_sensor_adjustmentemcgd.pdf
    • http://rumurel.mywebcommunity.org/tatifogutosafixusa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lagazirixul.rf.gd/zafibile.pdf
    • http://sarutufasiko.atwebpages.com/bodybuilding_anatomy_1st_edition.pdf
    • http://femagela.myartsonline.com/mudolomotukufag.pdf
    • http://fididebezewigex.epizy.com/android_studio_project_structure_changed.pdf
    • http://fiforeru.atwebpages.com/dip_pen_calligraphy_worksheets.pdf
    • 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_off0000d978.bin
745d9b8b7314cfbe75e263feb418d7054c4692233ccdcc2b73d3b9a68ba6814d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD978 5496 bytes
font_01_sfnt_off0000ec11.bin
73bb20d2cff0690e03b335d247afcd4c477f4355f64651b3539c9b62be403382		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC11 10924 bytes

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