Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96c44c42fba0991…

MALICIOUS

PDF

75.1 KB Created: 2021-04-05 10:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4e0dfc199c5c7c95fac77452bb690747 SHA-1: b81ef67c909ee6a281374ae34576dfbafc3948da SHA-256: b96c44c42fba0991fb5a73d0c70d5f94df5ad8ab4eb2b1f8c607f4aa3125d443
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to trick the user into downloading a malicious payload or visiting a phishing site. No scripts were extracted, but the overall structure and heuristic firings suggest a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/award?keyword=binary+subtraction+methods+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485927/normal_5ff53b7ae7e55.pdfIn PDF document text
    • http://dodemawaj.iblogger.org/transfer_of_training_in_sports_bondarchuk.pdfIn PDF document text
    • http://viniveba.mywebcommunity.org/bones_in_human_body.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450732/normal_600d0eda76eed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415302/normal_5fe8998d628b6.pdfIn PDF document text
    • http://fonudesuwobulud.mygamesonline.org/tuberous_sclerosis_treatment.pdfIn PDF document text
    • http://ruguwafe.scienceontheweb.net/62137857714.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367667/normal_5fd2eeebb3801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465704/normal_6028c4ba8fa46.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/aa3aabca-c7ad-4a40-88d2-e4c7352be31b/65141128039.pdfIn PDF document text
    • http://fasewevabudumu.epizy.com/90106804921.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/toronto_blue_jays_font.pdfIn PDF document text
    • http://vizomonuzujo.onlinewebshop.net/dokevanivutariwuseso.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/zakupomukulizigimodojewab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd0779f8-bd17-4420-8cb8-1b70acc5e1ef/wosevubiwarabowi.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/api_platform_symfony_demo.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/92461683834.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/60936573450.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/motebipogikit.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/computer_networking_basics_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4978371d-4a80-4360-a7f8-b9160185c742/dolovubisagigefitojiv.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/25109949364.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_off0000e59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59A 5652 bytes
SHA-256: 7793dcd472c3d66363aa28062af8e6c1cde77378a016b7188af0fde9092d377b
font_01_sfnt_off0000f8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AD 10672 bytes
SHA-256: 0cca187422c65627836bde58f2b817683563194b2de3599637b6fc8bce5c1404

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