Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3fc4fec766b5403…

MALICIOUS

PDF

84.7 KB Created: 2021-03-15 09:30:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3838c4bd9ef53997db266c62661b17da SHA-1: 76b931165e892710508278445104cd9f49bb5df8 SHA-256: e3fc4fec766b540380330253e08738b1cfe1a947e7d8e016a3c5380bc36cc8a1
136 Risk Score

Malware Insights

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

The PDF contains multiple suspicious links, with one specifically noted as an invisible link to a domain associated with phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple obfuscated URLs points to a phishing campaign.

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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/wix?keyword=ihuman+case+study+answers+quizlet
    • http://ashotik.space/892626403345wn5v.pdf
    • http://jobauthor.online/loviseruwovetajobipamuc9012.pdf
    • http://zdorovie-vashe-vse.xyz/97168341064x1hol.pdf
    • http://uscovidcharts.com/73746053745q4u32.pdf
    • https://cdn.sqhk.co/juvebuzizej/cjcRhbt/piano_music_notes_on_scale.pdf
    • https://cdn.sqhk.co/gizukakom/Ghhhhk2/paper_wings_song.pdf
    • http://dress-russia.ru/pamexepldzw2.pdf
    • http://esclick.pro/htc_desire_eye_battery_removable_or_not9nwja.pdf
    • http://fixmarker.fun/zevanogunokivkthua.pdf
    • http://lnstagram-support.live/biotic_and_abiotic_features_of_the_daintree_rainforesth6lbt.pdf
    • http://all-system7.club/android_x86_oreo_requirements7r5it.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_1268cfa66fbe4d46a21e37986cd6213d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0c9e1e68-54b1-423b-9a50-21bb91379b3f/super_mario_bros_theme_piano_sheet_music.pdf
    • https://uploads.strikinglycdn.com/files/c432dcce-4ffc-426b-b65e-396d7fe3dc2c/recoleccion_de_datos_en_la_investigacion_cualitativa.pdf
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_a3e8c8518f2347c88694f0e325abce39.pdf?index=true
    • https://79e8b926-cc52-4cef-90ae-68e3990d752e.filesusr.com/ugd/694d5d_987f57cebd154f47ad51def4c86d6939.pdf?index=true
    • http://naxixexofeveto.epizy.com/photoshop_event_poster_template_free.pdf
    • http://kabekanofaxo.epizy.com/lisami.pdf
    • https://uploads.strikinglycdn.com/files/ab59c877-cb86-428a-a820-8e74f3742d8c/vekebojegebige.pdf
    • https://uploads.strikinglycdn.com/files/3208492d-2b4d-451e-b60e-0916128925ea/wulavekotewedijorulo.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_off00010d5a.bin
93bd5305f952b80a8b37bfdc7e36f0f8b07c9844d0ef05b65a485e2cd5bf321b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5A 5488 bytes
font_01_sfnt_off00011feb.bin
25df27b9a47699860ddf95f748faa2b5c1cc07d981884bdbe9172fc88d96b739		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEB 10928 bytes

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