Malicious PDF — malware analysis report

Static analysis result for SHA-256 76310ee5391784fe…

MALICIOUS

PDF

63.2 KB Created: 2021-04-03 19:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e3d6675ec827a68077ee4dfeb121b578 SHA-1: 33b444e25e175dc81242bd1857f37d844f0b3d0d SHA-256: 76310ee5391784fe79628fb392180a59a8f4a15b94d533793db5dd5b3a7d2c54
154 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8428

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/strik?utm_term=context+clues+worksheets+3rd+grade+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374703/normal_603cc4c5e79e2.pdfIn PDF document text
    • http://leadtop.co/94172333727ahodt.pdfIn PDF document text
    • http://apparently-home.com/dililumumoroduruziuqq.pdfIn PDF document text
    • http://motivawka.online/jasudetunapegejejg58v6.pdfIn PDF document text
    • http://motivawka.online/94600516842fy220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459057/normal_60550613a4251.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460694/normal_60333e0fdc076.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_dc25c8ba99ff4f2e8b71f5f3ddc37b7d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e881d00e-1258-4f15-ba57-df59e06edb79/rikujeratizu.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/mcdonald_s_menu_nutrition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d6d42ce-5cc9-4151-94ed-387675c536ea/high_yield_topics_in_surgery_for_neet_pg.pdfIn PDF document text
    • https://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_bb5cbb0452ee40889d4a7c1d5df40f35.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/m_s_c_ka_full_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70747d29-795a-4d4b-b9e2-76825ee873c2/89433442284.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/25170211172.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/best_free_android_barometer_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/614f8bea-66ea-4e44-9cf6-e3f49ddccc9e/malej.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/weather_report_kolhapur_maharashtra.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/40183614537.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/epson_wf-3540_ink_cartridge_not_recognized.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CF 5708 bytes
SHA-256: e4a59cff857eb91b4c4bbf3bfe191537122d53eca2fdbf7b650b9083018ea474