Malicious PDF — malware analysis report

Static analysis result for SHA-256 385df4353fde5909…

MALICIOUS

PDF

77.5 KB Created: 2021-04-05 04:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75df6e5baf28b29606335eaf2286d95c SHA-1: 133771e4894a67c31f67182b8193f16bbad26b49 SHA-256: 385df4353fde5909b6adaffee9a91bc41d812cd4013c530dc12b268e7762606e
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URI pointing to 'kuzutuzo.ru', likely a malicious domain used to host further stages of the attack. The document body, though heavily obfuscated, suggests a lure related to 'Json simple tutorialspoint', aiming to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=json+simple+tutorialspoint
    • http://pifowovumuwe.medianewsonline.com/how_to_change_the_battery_on_an_ipod_nano_4th_generation.pdf
    • https://static.s123-cdn-static.com/uploads/4496602/normal_5feb97730c290.pdf
    • https://static.s123-cdn-static.com/uploads/4450148/normal_5fc95459733a4.pdf
    • http://janipuwibir.mywebcommunity.org/journey_to_the_center_of_the_earth_1959.pdf
    • http://fonixeguga.mywebcommunity.org/fedotutadoluk.pdf
    • http://vodabutopidaru.getenjoyment.net/ignou_assignment_front_page_2020_19_download.pdf
    • http://nomenowunesazoz.scienceontheweb.net/18838693241.pdf
    • https://cdn-cms.f-static.net/uploads/4446015/normal_5fd7ce9020627.pdf
    • http://gopidap.scienceontheweb.net/55759954873.pdf
    • https://cdn-cms.f-static.net/uploads/4483604/normal_602a2a195c9ed.pdf
    • https://static.s123-cdn-static.com/uploads/4426088/normal_5fe34cc17bae1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jagux/jio_phone_call_recording_apk.pdf
    • https://a8a57b57-a5e9-4b5c-b824-02731ce3a1bd.filesusr.com/ugd/cfa667_63d6665c17184923a00801659a283e43.pdf?index=true
    • https://s3.amazonaws.com/dudujopixejikug/27569181957.pdf
    • http://tavoxelelenasi.onlinewebshop.net/55234348687.pdf
    • https://0978d23c-7b87-408a-b4ab-ff16da0dae51.filesusr.com/ugd/369d68_abb9543e347d436dbcf80b4cd28602ea.pdf?index=true
    • https://s3.amazonaws.com/nuxomigo/small_bell_jar_pendant_light.pdf
    • https://fb075467-9d00-46c6-93ac-2b777f5e584b.filesusr.com/ugd/8bcd66_252b488557de4e58bd563ae0bff2d63d.pdf?index=true
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_322f34b6e187478dacb3464b56704d2c.pdf?index=true
    • https://s3.amazonaws.com/wakuzidi/pit_bike_race_carb.pdf
    • https://7fd672c9-0ac8-42d3-9d3c-9ebb2fbea2b4.filesusr.com/ugd/92785a_317eed9faac34267b18e2722430f76b3.pdf?index=true
    • http://forojiwimudobo.atwebpages.com/98802299753.pdf
    • https://s3.amazonaws.com/luxelula/the_three_billy_goats_gruff_story_for_preschoolers.pdf
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_216d2172c65543be8f6ff42bef3e1846.pdf?index=true
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_41a0e85bba6f4ef2950dc5baff49d455.pdf?index=true
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_8dc4282b5b28446ea5d3820b8994e99c.pdf?index=true
    • 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_off0000f159.bin
00b375705f219018bd54483faf9fcf225159281fe8cff5439d0c9c5ab179d190		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF159 4956 bytes
font_01_sfnt_off00010217.bin
b3f936603253ba311e94482b006067850efeba81e6f0f1cd4c7c5e226d283250		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10217 11180 bytes

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