Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9efa4b8be97f3fd…

MALICIOUS

PDF

76.7 KB Created: 2021-05-17 17:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d3b115e369d5c76bd4092c3e91d0e7f5 SHA-1: 22c607c29eac6f8239095f452d89f56e94837c99 SHA-256: b9efa4b8be97f3fd06e9a0f521532cee445ea02cdbc39ffa7e58d144331d113c
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, which is a strong indicator of a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of the file. Although no scripts were explicitly extracted, the presence of an external URI suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jacksth.ru/strik?utm_term=presonus+studiolive+ar16+sd+card PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4496374/normal_5fe3f0ad6a6c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365542/normal_601e5055c20f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423137/normal_6003bd0c3a71c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391315/normal_60124a343966b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493195/normal_5fca6c6bdf6c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494875/normal_602d470e814d6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puzexexaniledow.epizy.com/68269538729.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/how_to_charge_citizen_eco_watch.pdfIn PDF document text
    • https://s3.amazonaws.com/filidabut/are_troy_bilt_push_mowers_any_good.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/5953402940.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/41272457800.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/39534162545.pdfIn PDF document text
    • http://gijomifede.rf.gd/bomekejunofuxupufab.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/35030973205.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/axtone_acapellas_vol_4.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/nabijakosesazigij.pdfIn PDF document text
    • http://vezigaje.epizy.com/13700613581.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/wekuwesaletovawokovap.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_off0000e8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AF 5200 bytes
SHA-256: a99e9b889b7c9df6fa9965692f5c9116253a8857c4bab6f5ff7d6f58d4236550
font_01_sfnt_off0000fa78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA78 12336 bytes
SHA-256: 1f8615eb9f724cd05417207d95b31c21cee352ca43e6ca5aa4dab200d8152907

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