Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd393b1ca417f5e…

MALICIOUS

PDF

78.5 KB Created: 2021-03-18 11:56:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 31fc2787805a3b618dcd378916dbfd8d SHA-1: ae998e5df36c6dcdf8a934adcc4ee86ece80bb16 SHA-256: 6cd393b1ca417f5e659feb41be070b78da58bfd35d092a0e4301138195d47808
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an external URI pointing to 'nipisod.ru', which is likely the download location for a secondary payload. The presence of a 'download button' heuristic further supports the phishing lure attack pattern.

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/award?keyword=building+construction+sushil+kumar+pdf+download PDF link annotation
    • http://kopuvimu.scienceontheweb.net/28697044056.pdfIn PDF document text
    • http://domsale.xyz/nigupugegituy5bgs.pdfIn PDF document text
    • http://tapidiv.medianewsonline.com/4462965326.pdfIn PDF document text
    • http://vumajufeboxidik.mywebcommunity.org/sierpinskis_triangle_formula.pdfIn PDF document text
    • http://pubomoxagu.22web.org/17975797174.pdfIn PDF document text
    • http://kafidovomiguvo.mywebcommunity.org/college_registration_form.pdfIn PDF document text
    • http://jekigun.22web.org/stock_charting_software_free.pdfIn PDF document text
    • http://hyipinvest.site/why_is_my_vape_charger_blinking_red_and_greenqdcj4.pdfIn PDF document text
    • http://wegaturagifo.getenjoyment.net/fuwevaba.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
    • http://zubiluwetij.myartsonline.com/what_is_the_difference_between_agile_scrum_master_and_professional_scrum_master.pdfIn PDF document text
    • http://wejajesenopezoj.onlinewebshop.net/how_to_turn_on_oster_coffee_maker.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/37384666814.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/32851978115.pdfIn PDF document text
    • http://danetuxu.rf.gd/kasusanatibikokexezo.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/wisaxukirazawefiloxigibex.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/lumojedojew.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/notedevowojes.pdfIn PDF document text
    • http://rivetibixonapaz.myartsonline.com/98172407982.pdfIn PDF document text
    • http://wupumodo.epizy.com/bezefeliwedunabefurul.pdfIn PDF document text
    • http://sudolurimav.epizy.com/29798267051.pdfIn PDF document text
    • http://lisotabisalak.epizy.com/65298184084.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_off0000e612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE612 5536 bytes
SHA-256: aca8c628f6b2371b1bf5c621a5258012c0f427a22df7c1ae995519e220632a82
font_01_sfnt_off0000f8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BE 10960 bytes
SHA-256: 20da103151990ef69ed3d21fe01c19213a96828f3990b18189fbd9aa4e20f48f
font_02_sfnt_off00011e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E42 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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