Malicious PDF — malware analysis report

Static analysis result for SHA-256 96e784dd5d8d4e86…

MALICIOUS

PDF

79.5 KB Created: 2021-03-01 01:12:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6bad14271f8d48f3589e00f7a33d7fbc SHA-1: ec3c328913e00c899486ab947a2fe2709ddb6c71 SHA-256: 96e784dd5d8d4e8619fbcf6b8501565eae557b45a3a194cbf8c56ef550d85002
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 by heuristics as PDF_URI and EMBEDDED_URL. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary URL, https://nipisod.ru/wix?keyword=circumference+of+a+circle+word+problems+worksheet+pdf, suggests a lure related to educational worksheets, likely to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/wix?keyword=circumference+of+a+circle+word+problems+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/zadorari/u8cfhjl/vepiwipobo.pdfIn PDF document text
    • http://xodinazafomizi.22web.org/dragon_s_dogma_trophy_guide.pdfIn PDF document text
    • http://zerudomafiko.iblogger.org/11955357902.pdfIn PDF document text
    • https://xazonidunigi.weebly.com/uploads/1/3/4/5/134590253/rewabajelut_velawi_megapilifuraza.pdfIn PDF document text
    • https://dovabobu.weebly.com/uploads/1/3/5/9/135978637/jemadafa.pdfIn PDF document text
    • https://bevikafu.weebly.com/uploads/1/3/4/7/134710030/8417321.pdfIn PDF document text
    • https://jerefukixuludew.weebly.com/uploads/1/3/4/6/134686450/968e510.pdfIn PDF document text
    • https://xuzekivaf.weebly.com/uploads/1/3/1/4/131453918/4abc7558a.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/farefasejikap/29110062913.pdfIn PDF document text
    • http://lelekon.epizy.com/5th_grade_language_arts_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/66214282476.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/gojujizidujeze.pdfIn PDF document text
    • http://wirirarosutuki.epizy.com/scaled_bar_graph_worksheets_3rd_grade.pdfIn PDF document text
    • http://wepaxilex.epizy.com/strengthsfinder_list.pdfIn PDF document text
    • http://sadexukemovebi.epizy.com/5621638219.pdfIn PDF document text
    • http://zariwatanelil.rf.gd/62926897487.pdfIn PDF document text
    • http://muwaziri.epizy.com/honeywell_xenon_1900_scanner_reset.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/tugoxilefanijav.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_off0000df56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF56 5596 bytes
SHA-256: 3bcdd658152b02393fc06e57ca1e4998a3c519efdc99427b3a7fd586eeae29fc
font_01_sfnt_off0000f239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF239 10984 bytes
SHA-256: f1262445b9c56df4c91fab0e32df6f7d07adf11b535b2eb10ff7ca7f208081be
font_02_sfnt_off0001181a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181A 16324 bytes
SHA-256: 5f51a05aae2360689a83dd48566028676a2d2491096f0e743ab36e73d4f5e6bc

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