Malicious PDF — malware analysis report

Static analysis result for SHA-256 998f9b825015e8aa…

MALICIOUS

PDF

73.0 KB Created: 2021-03-15 04:30:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 993ebdf137d44fc629d239ca8840bcc9 SHA-1: 5f7ca16828db8680a5101ec6be9b080833b62ee4 SHA-256: 998f9b825015e8aa203e6427aa2e51f5e5c3383239c25d57f248b00d6211ddb6
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URI pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, appears to be related to academic content, suggesting a lure to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://bologen.ru/wix?keyword=chapter+18+reaction+rates+and+equilibrium+guided+reading+answers
    • https://static.s123-cdn-static.com/uploads/4475389/normal_5fedc4149eac3.pdf
    • http://zepawagir.iblogger.org/online_music_library_project_report.pdf
    • https://cdn-cms.f-static.net/uploads/4374518/normal_602a754fd02f5.pdf
    • https://cdn-cms.f-static.net/uploads/4448126/normal_604699992bc0b.pdf
    • https://cdn-cms.f-static.net/uploads/4366645/normal_602da28e948ee.pdf
    • https://dijafujuzu.weebly.com/uploads/1/3/4/3/134369935/e7d7b1.pdf
    • https://sesuzefodapu.weebly.com/uploads/1/3/2/8/132815176/judaxetatalovuruva.pdf
    • http://kufafukedexepix.mygamesonline.org/16598896037.pdf
    • https://ruxunomitebapat.weebly.com/uploads/1/3/1/6/131606858/panemugifa.pdf
    • http://nuraner.iblogger.org/62294358757.pdf
    • https://cdn-cms.f-static.net/uploads/4453102/normal_60154e5d70a62.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/67abb87f-8dba-4ff7-b761-173eddcd16e1/distributed_systems_book_download.pdf
    • https://uploads.strikinglycdn.com/files/58d0d53c-0a80-4b9c-aba4-32da0b154618/74163109662.pdf
    • http://votixeju.onlinewebshop.net/bilingual_benefits.pdf
    • http://jofufabebeboxur.rf.gd/4698014900.pdf
    • https://7f58a6d3-5723-489e-a2bd-17fd91e1ddd5.filesusr.com/ugd/655495_aabf5f4893424f7aa2a6af12c030f73f.pdf?index=true
    • http://naxesabefadufu.atwebpages.com/fefim.pdf
    • http://lapetagalelan.myartsonline.com/nuxepo.pdf
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_478fdcde586f43b1a8c64bd782fca219.pdf?index=true
    • http://pekowob.onlinewebshop.net/zijimidefepajubetetesem.pdf
    • http://mesepizizar.rf.gd/what_does_milkweed_mean.pdf
    • https://9abff256-b119-4e75-a612-dfc075f5428e.filesusr.com/ugd/c73517_5a53eacbf5ad4ec7b93d8c9103bd2ac5.pdf?index=true
    • http://zemufobure.rf.gd/platform_cafe_williamstown_vic.pdf
    • https://uploads.strikinglycdn.com/files/8c9b7c4b-1144-4d62-8091-fc7e9f39d913/mubofifopojufekedud.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d118.bin
8124b25f3a1a6ecc9424c7a38d1b703ec344a4351a32a54942bfd8baf461d7c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD118 5996 bytes
font_01_sfnt_off0000e553.bin
2c2196bae8d9a8312a12567c766d6078c1dabe69225c5dcd1d76bb6e64e41115		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE553 10240 bytes
font_02_sfnt_off000107f4.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107F4 4324 bytes

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