Malicious PDF — malware analysis report

Static analysis result for SHA-256 e744a95b6648128c…

MALICIOUS

PDF

75.5 KB Created: 2021-03-23 03:54:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 559d3ee2736dc698a7f9408416eff201 SHA-1: 4021e5dafeefd662eb2cbef316a6829a46f042bd SHA-256: e744a95b6648128cb07b854a4e51cc1c09804fe8d415f3a81a9dd93d1bd53cf0
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to educational exercises.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/strik?utm_term=gerund+or+infinitive+exercises+elementary
    • https://cdn-cms.f-static.net/uploads/4384835/normal_6029deb297ca0.pdf
    • http://ravovenovibu.medianewsonline.com/social_psychology_david_myers_11th_edition.pdf
    • https://cdn.sqhk.co/zavufepugife/hcggbtl/tudalumuli.pdf
    • http://mamefumiwuto.mywebcommunity.org/how_do_i_reset_my_bryant_thermostat.pdf
    • https://cdn-cms.f-static.net/uploads/4367667/normal_5fd647e562681.pdf
    • https://cdn-cms.f-static.net/uploads/4414866/normal_601d84211c5b9.pdf
    • https://cdn-cms.f-static.net/uploads/4470408/normal_5fd233199c6d4.pdf
    • https://cdn.sqhk.co/foroboreb/ggyyTf6/67871977655.pdf
    • http://rafupofamurawaf.mygamesonline.org/36146416505.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://telifujovemevo.atwebpages.com/34593479533.pdf
    • https://uploads.strikinglycdn.com/files/953b369f-b37b-4c54-bf82-85f2360cacd6/how_to_reset_danby_portable_air_conditioner.pdf
    • http://bujekotu.atwebpages.com/linefugedabi.pdf
    • https://uploads.strikinglycdn.com/files/70bce295-40dc-4b3e-9910-7f67bddc184a/69852125960.pdf
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_0cf091ca8de646a497f954c6544516a9.pdf?index=true
    • https://s3.amazonaws.com/ronatiduzoxij/ribowe.pdf
    • https://uploads.strikinglycdn.com/files/9308b602-23d9-4857-adc6-4de0675aa4cd/vutifu.pdf
    • https://s3.amazonaws.com/banula/what_are_the_best_songs_to_learn_on_guitar_for_beginners.pdf
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_bdb5a2666f58419f9ec141df83a59e97.pdf?index=true
    • https://s3.amazonaws.com/tozaduliwubega/kefeluxen.pdf
    • https://uploads.strikinglycdn.com/files/30f5d857-7143-48d2-a013-9641d4f28b9a/compound_shapes_rectangles_worksheet.pdf
    • https://s3.amazonaws.com/zedudo/top_100_most_common_korean_words.pdf
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_a371563bf89546ffb97f757478bcdf04.pdf?index=true
    • https://0f939073-77d1-4307-aaa8-42539c8515e3.filesusr.com/ugd/85c9df_43a54761072343f3b0316298b7a57f08.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_off0000ea3c.bin
9a0dd023719c8c9a5c858292a40c8f57c766f35607892618e17ef0d278142ba4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3C 5428 bytes
font_01_sfnt_off0000fcb3.bin
bc866187f12e4bc702885483bc616ae45100b08044d3a1f52baf5e6fcfc17d03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB3 10444 bytes

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