Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d3a1a453c32e8b…

MALICIOUS

PDF

136.9 KB Created: 2021-03-10 15:53:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c977e2c4f19a688049a62e2f9482cf07 SHA-1: ab9cf0d8cab82339ae0110c71b52e439938243b6 SHA-256: b4d3a1a453c32e8b335b094a2b85e4979cb6ed395f14f2bbe4a96d9177735057
96 Risk Score

Malware Insights

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

The PDF contains an external URI pointing to a suspicious domain, which is a strong indicator of phishing or malware distribution. The ML classifier and ClamAV detection further confirm its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content, likely for credential harvesting or further malware deployment.

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://golowaki.ru/wix?keyword=22+founders+of+delta+sigma+theta+song PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447276/normal_6023d1b7db987.pdfIn PDF document text
    • http://letgtma.bid/download_steam_for_windows_10_offline_installer3j0dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382414/normal_6036ad1aea239.pdfIn PDF document text
    • http://ueuniti.xyz/machinery_maintenance_schedule_template_excelqzb6e.pdfIn PDF document text
    • http://legko.travel/fervent_book_study_guidejr9uj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366987/normal_5ff7d3cd8ac1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451205/normal_5fda7f691ab08.pdfIn PDF document text
    • http://lidlid.xyz/10265916014qkevn.pdfIn PDF document text
    • http://roskycnmx.com/759914694650166b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411252/normal_602c06eb1c7be.pdfIn PDF document text
    • http://mugisawitunolaf.iblogger.org/93584174598.pdfIn PDF document text
    • http://ruzeviliv.iblogger.org/ambition_law_institute_notes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/66999291702.pdfIn PDF document text
    • http://xewewiwuxadul.rf.gd/gisaxama.pdfIn PDF document text
    • http://lotidasifiteg.epizy.com/dotugobepivijefodenijudid.pdfIn PDF document text
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_cdbab83356fd4d5689f9c0ec5d58ccd1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nonabafat/90319528829.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/medela_breast_pump_electric_vs_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/writing_task_1_sample_answer_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/gtb_aptitude_test_questions.pdfIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_a6dbccd3f812409eadb1e959893ca512.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/donopib.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_off0001de37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE37 5356 bytes
SHA-256: b417060ecf1a7d03cdb773936321be116a52a45d75d6df33f56e3bf6ccc55f72
font_01_sfnt_off0001f043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F043 10964 bytes
SHA-256: c5ba8d13d29bf60d8b86ba69728f764aa5d2c66c448254e6d32c282e24d5c2a3

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