Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d1e2c3a2cce876…

MALICIOUS

PDF

86.5 KB Created: 2021-02-17 13:52:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0422e992563a2be9af7247ff4ff677e7 SHA-1: 6ae3f7b06ef5eb01d8372927272297a0dd280aba SHA-256: 16d1e2c3a2cce87639c1b2b7cb87f554d1fe1d6ca785bc70d56dd530adfd1b0c
96 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URI pointing to a suspicious domain, masquerading as a worksheet answer key. ClamAV and ML classifiers have identified this PDF as malicious, specifically as a phishing trojan. The presence of an external URI suggests an attempt to redirect the user to a malicious resource, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=light+reflection+and+mirrors+worksheet+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416932/normal_5fe39d850852c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474978/normal_6015c619a488d.pdfIn PDF document text
    • https://rugeponejap.weebly.com/uploads/1/3/4/4/134487210/soxokafemabuju.pdfIn PDF document text
    • http://axacheat4.xyz/wajuwosenujaxagorijupf5uud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468812/normal_5fe788e0233f1.pdfIn PDF document text
    • http://bofesota.66ghz.com/xotejikovuwive.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384050/normal_6001e46675f09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403418/normal_6029fcd19b54b.pdfIn PDF document text
    • http://creditscorehelp.info/25536803647mw7ho.pdfIn PDF document text
    • https://zuwukozoxuwiged.weebly.com/uploads/1/3/4/7/134713444/bumupapitiwobu.pdfIn PDF document text
    • http://matrixbicycles.com/peter_pan_novel64moj.pdfIn PDF document text
    • https://bomovote.weebly.com/uploads/1/3/5/3/135398027/5f598b9de858f32.pdfIn PDF document text
    • https://dapijapivabug.weebly.com/uploads/1/3/4/3/134338952/d197753c8778.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368495/normal_601e19383116b.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/lososimap/piriformis_muscle_pain_test.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/dark_souls_3_all_npc_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/67581804505.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/hayfield_school_ofsted_report.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_off00011425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11425 5632 bytes
SHA-256: c090eb158718758a1e262269c56691fbf22595c963f399f75ee0c9716df23283
font_01_sfnt_off00012743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12743 10864 bytes
SHA-256: 1b6c5d7f199f31edfdb4dea28c65db13af6245b3835bec50bafe1afe460d0f95

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