Malicious PDF — malware analysis report

Static analysis result for SHA-256 05c3e9608cd66d1e…

MALICIOUS

PDF

87.0 KB Created: 2021-02-24 16:44:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 40ddaecc36399eeadc82827bdc80ed0d SHA-1: 4fde81f183341240b805797df1375c346a7b34eb SHA-256: 05c3e9608cd66d1e1b5b61eabee6d5a26a89a00e4c493210a28e4620c9a4d575
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'baarspo.ru', which is likely a phishing or malware distribution domain. The document body, though heavily obfuscated, suggests a lure related to 'The Merchant of Venice' workbook questions, aiming to trick users into clicking the malicious link. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest it's a phishing or downloader document.

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://baarspo.ru/strik?utm_term=merchant+of+venice+act+2+scene+8+workbook+questions+and+answers PDF link annotation
    • https://cdn.sqhk.co/xevowuto/dgeFRhh/23283322837.pdfIn PDF document text
    • https://letezinujafi.weebly.com/uploads/1/3/4/9/134901841/juboto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406456/normal_5fd04fab7e2bd.pdfIn PDF document text
    • https://cdn.sqhk.co/kagumuzom/lFk2xha/wemubepegeles.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471488/normal_5ff9f14c4ae6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504870/normal_5fe63cdbe414b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402724/normal_5fcf25f8ca2d0.pdfIn PDF document text
    • https://jokesekarizav.weebly.com/uploads/1/3/1/4/131407558/jenuzose_patodisijez_toremudun.pdfIn PDF document text
    • https://cdn.sqhk.co/delopomixaba/ihbiggh/christian_homeschool_programs_california.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477913/normal_6016e2094cad9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491151/normal_6011ca994b35e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nitatotol/been_calling_music_video.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/josukozavikukazuroretan.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001091c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091C 5772 bytes
SHA-256: 83381c2f7cd6a5bbb61b9e5cda3733332c57dd1f75cf796ad25666e80621b371
font_01_sfnt_off00011cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC6 10348 bytes
SHA-256: 0a4eb198bcbd485ca2dfbb4f73134d2c99c8d8ebd4adb1003ddac115a992f0cb
font_02_sfnt_off00014002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14002 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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