Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5f1fa53f517e03…

MALICIOUS

PDF

87.8 KB Created: 2021-03-17 03:18:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 86011cf96c8bb890fb865211b164a0ea SHA-1: ef25ed9167a2f969a69fa99d2ec4760ac2e9661e SHA-256: ca5f1fa53f517e03db77477ed8cba21437f53054a6b7adbfc2962a60cc18aa58
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that, when visited, likely leads to a phishing or malware distribution site. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to academic content, aiming to trick users into clicking the malicious link.

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://zajinet.ru/award?keyword=biochemical+engineering+and+biotechnology+2nd+edition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407102/normal_5fd6a1d6d22e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494432/normal_5ff6c51f35110.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375196/normal_6041980563aeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473645/normal_6045132499f1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459470/normal_5fe1709031136.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486199/normal_6007d0cd6502e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410956/normal_60322aff5267c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463277/normal_603f33160b3b6.pdfIn PDF document text
    • http://zedukibawubige.22web.org/injury_report_form_worksafe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0481823e-1b9c-4512-830b-f6b3d3346223/how_much_does_it_cost_for_a_psychological_evaluation.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/nefabivalunosukiwidabeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/714ae588-fd4c-4b94-8d8a-7a331d8dea6a/universal_studios_stairs.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/dalepu.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/effect_of_globalisation_on_indian_society.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/casio_altimeter_watch_manual_3202.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/324d8b3b-8f25-45fa-be7f-141218979145/how_to_change_armitron_pro_sport_watch_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dbfeb9d-ddf1-4562-bdce-eecdc9b9d228/coby_intense_wireless_earbuds_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50684829-e2e0-454e-8568-11d8ec23abc4/37752530373.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/gokaparalujokasanifed.pdfIn PDF document text
    • http://vominobig.rf.gd/27929381392.pdfIn PDF document text
    • http://jefesati.rf.gd/ketifolavakabatujekuf.pdfIn PDF document text
    • http://pamegapag.epizy.com/which_brand_of_hearing_aid_is_best_in_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/70150756813.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/xosan.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11925 5812 bytes
SHA-256: 8761fc072069df7ff1362d2403f93683744a7b086b2db24a73f6d74346c7bf53
font_01_sfnt_off00012cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCE 10824 bytes
SHA-256: 62e6a3b5abc02d6a90507cc4272536b45cb5cc7e5bd45878ac63367168353f30

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