Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4234a34c6ecd3a…

MALICIOUS

PDF

97.5 KB Created: 2021-03-29 17:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 19840a9fc4e7aca5e1f1ac82a35e4715 SHA-1: e37474b2144d12dd7f6bfc16b42451cd06ccb0e3 SHA-256: fa4234a34c6ecd3af20d6a424592993917ce0f513eccdef2074a68b69a1fac3f
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL, identified as malicious by ClamAV and ML classifiers. The document body, though heavily obfuscated, suggests a lure related to educational worksheets. The primary IOC is the external URI pointing to a suspicious domain, likely intended to host a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/strik?utm_term=division+of+fractions+worksheets+common+core PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446374/normal_6014eff8efa14.pdfIn PDF document text
    • http://ruluzuzadol.mypressonline.com/cuisinart_cbk-200c_convection_bread_maker_review.pdfIn PDF document text
    • http://jijomaj.getenjoyment.net/97843564927.pdfIn PDF document text
    • http://lagidonak.mygamesonline.org/65872807131.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459641/normal_5fe57b5fb999a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392656/normal_605d694824886.pdfIn PDF document text
    • http://motozed.scienceontheweb.net/complete_ukulele_chords_chart.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383687/normal_6009a68c3bea0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408475/normal_5fe2da7e82cf7.pdfIn PDF document text
    • http://wepijafiguwenan.mywebcommunity.org/64788195867.pdfIn PDF document text
    • http://lomuwugevona.getenjoyment.net/pamotewo.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/tugafebip/54678931755.pdfIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/jozafivulenefolugadixigar.pdfIn PDF document text
    • https://74269c25-1731-4359-90d4-804f54ef9c1c.filesusr.com/ugd/b5973a_39820a942f0245ef999e9d880559556c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/camouflage_pattern_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/diseti.pdfIn PDF document text
    • https://e1dd9d5d-2564-403b-b9eb-750b563e155e.filesusr.com/ugd/00b056_5c872d6e9725441890ff02eef12f2f83.pdf?index=trueIn PDF document text
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_4cc3920a81234f68978238695a3488b0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/buderus_oil_boiler_manual.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C27 5304 bytes
SHA-256: 799d6a315b504353b9e6f9489eca29311baaf42e98cda7b92d1d6cbb32ece8e6
font_01_sfnt_off00013e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E2B 10696 bytes
SHA-256: 59012de34254327b39e091645c5adf280a589d6aff94490051cde851f35e4d44
font_02_sfnt_off00016301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16301 16176 bytes
SHA-256: 423a95f51e0e1478e9faedb0fbe9194f83470cf0733ac5785755799148eb902f

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