Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8522526c0fab032…

MALICIOUS

PDF

75.1 KB Created: 2021-03-15 08:13:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 624808ac5360c5de6b617fc487a45f4d SHA-1: d647169917c34e29d99947612a43ed57b0e73191 SHA-256: a8522526c0fab032f5d61ace941b48b883fe9c8b3ccf826aa8d7e947218719f8
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an external URI pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged it with high confidence. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs indicates an attempt to redirect the user to malicious content. The primary IOC is the external URI, which is likely used for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=cosmetology+textbook+online
    • https://cdn.sqhk.co/piwizogir/fibdhd4/never_have_i_ever_questions_extreme_clean.pdf
    • https://cdn.sqhk.co/xitilesuxiw/hheexVR/myasus_service_center_uninstall.pdf
    • http://reassurez-moi-fr.info/duzagaziwetidalolokigontnmss.pdf
    • http://glasshookahcatering.com/430787972901twgn.pdf
    • http://felagem.getenjoyment.net/the_crucible_john_proctor_tragic_hero_quotes.pdf
    • https://cdn.sqhk.co/nojedajoze/sLidjjL/halo_rover_hoverboard_video.pdf
    • http://jokafoziber.22web.org/fopuniferugoduzedug.pdf
    • http://kernig.pro/ice_age_adventures_apkpureefzko.pdf
    • http://argo-tourism.com/film_frozen_flower_subtitle_indonesiaz4ka8.pdf
    • http://gavediteriremuv.medianewsonline.com/juego_de_el_hombre_araa_3.pdf
    • https://tepupareta.weebly.com/uploads/1/3/0/8/130814680/lujufal.pdf
    • http://fesuzeroba.iblogger.org/29796137274.pdf
    • https://goxadivitekoze.weebly.com/uploads/1/3/1/4/131437736/4313df328.pdf
    • https://vidapuromojesa.weebly.com/uploads/1/3/4/8/134890941/465b45.pdf
    • http://xesapuwax.mywebcommunity.org/fulovuwavikerugujaxix.pdf
    • http://delinapod.mypressonline.com/wekogobime.pdf
    • https://luzatewuxajexi.weebly.com/uploads/1/3/4/2/134265782/1045004.pdf
    • https://tedaliduvif.weebly.com/uploads/1/3/5/9/135957254/a8f89ef06670b37.pdf
    • http://aduo5.online/galaxy_live_wallpapers_full_hd_4k_apk6rcoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://juzuruwe.rf.gd/how_to_add_data_analysis_in_excel_2020.pdf
    • http://mafasegu.epizy.com/2005_lincoln_aviator_user_manual.pdf
    • https://s3.amazonaws.com/fizufapu/pakupu.pdf
    • https://s3.amazonaws.com/pukaridimupo/2001_dodge_dakota_owners_manual.pdf
    • https://s3.amazonaws.com/turip/kolkata_travel_guide.pdf
    • http://gewofudi.rf.gd/crca_sheet_mechanical_properties.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_off0000e81f.bin
b497a9fe35c71d59f744404ac9182d10448e98fbfc72d4027e50e677c9e7acb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE81F 4976 bytes
font_01_sfnt_off0000f910.bin
b8b2c196c5c19261f8bcd3f32b80ba87209436b4c3d33f02b504491ea5e898e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF910 11184 bytes

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