Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb766cfb6a2e18cd…

MALICIOUS

PDF

69.3 KB Created: 2021-03-23 23:31:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ba37337a029c2493eb44119e6d1128f SHA-1: 754d012fc6522d9e73642beb1702dbb14cd8e5ea SHA-256: fb766cfb6a2e18cd9f88e79bf87a57ab92f3d1a75492fd9f8c233d18d4280df7
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, appears to be a lure related to educational materials, suggesting a phishing attempt to redirect users to the malicious URL. No scripts were extracted, but the presence of the malicious URI is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dafemum.ru/award?keyword=b.+ed+physical+science+notes+pdf
    • https://cdn-cms.f-static.net/uploads/4377938/normal_600be2436dff4.pdf
    • https://cdn-cms.f-static.net/uploads/4376870/normal_6021c7213e964.pdf
    • https://cdn-cms.f-static.net/uploads/4380413/normal_60419261abab2.pdf
    • http://rerolakareruxom.22web.org/66410497990.pdf
    • https://cdn-cms.f-static.net/uploads/4458614/normal_601bce19a681e.pdf
    • https://static.s123-cdn-static.com/uploads/4382418/normal_5fdf2a1fcda69.pdf
    • http://xilofomodat.iblogger.org/ziridunafafinutevako.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_4c85eb2e76d845f7a8719435a8f3674f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2a811e73-e6ab-46b3-9269-e9d044bf782c/femof.pdf
    • http://xewenometan.epizy.com/firefox_offline_32_bit.pdf
    • https://2571d5ef-7130-409a-b87d-c3fd18a83f30.filesusr.com/ugd/71fc55_3625f08f102541a5918ef5ee9a171302.pdf?index=true
    • http://wizuxamop.rf.gd/bacteriophage_isolation_protocol.pdf
    • https://f7b0ef4b-317e-4f07-901b-4de91a029b50.filesusr.com/ugd/50f142_34926477edba4f35ac7744f6cf798cce.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e5c185f3-6420-44d5-9e66-9c142ce89b0e/punonamokosavine.pdf
    • https://916646f4-1085-46ff-a557-f209baee2087.filesusr.com/ugd/6c313a_020c62d7d476455597e89172d06d15c9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b96dd43a-217d-422a-9dd1-5cbd914363c6/buwujejukokigadusige.pdf
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_f0a79e79357a4cefa1db81a56b87274f.pdf?index=true
    • http://maxezexisog.rf.gd/does_a_minister_have_to_be_ordained_to_perform_a_wedding.pdf
    • http://webimonok.epizy.com/46209999840.pdf
    • http://tuwesexo.epizy.com/leishmaniose_ciclo.pdf
    • http://kemuvatixas.epizy.com/wimifo.pdf
    • http://tigofed.rf.gd/learn_spanish_textbook.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_off0000d3d5.bin
999e48ac69870f996cf4696edfc72d085ec413e008a5d14b1c688addee875206		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D5 5332 bytes
font_01_sfnt_off0000e60e.bin
bfc484574a17ac3913a138787057823e803ad9f755b21c90d8d361d498d5bbea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE60E 9936 bytes

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