Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d984bad3ef3deb…

MALICIOUS

PDF

73.9 KB Created: 2021-06-01 02:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9eb8974995cd2042a914659beff8924 SHA-1: 5c45e0535b6f67c520ead7130c8ed4a587b77f1c SHA-256: d8d984bad3ef3deb58906496ff845894e7d9e4ae276026fd68ccda5c52e74eb4
96 Risk Score

Malware Insights

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

The PDF contains an embedded URL that points to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • 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://coretry.ru/pbw?utm_term=english+test+intermediate+100+questions+answer
    • https://cdn-cms.f-static.net/uploads/4407314/normal_60611c4534e54.pdf
    • https://cdn-cms.f-static.net/uploads/4418166/normal_606834153d3d6.pdf
    • https://static.s123-cdn-static-d.com/uploads/4489028/normal_60b556d450247.pdf
    • https://static.s123-cdn-static.com/uploads/4444369/normal_5fceab2c5a3c5.pdf
    • https://cdn-cms.f-static.net/uploads/4407086/normal_602cd65e58383.pdf
    • https://cdn-cms.f-static.net/uploads/4450638/normal_6016fa1e5c94b.pdf
    • https://cdn-cms.f-static.net/uploads/4464715/normal_5feaec2372be6.pdf
    • https://static.s123-cdn-static.com/uploads/4405654/normal_60098de7249d7.pdf
    • https://static.s123-cdn-static.com/uploads/4422643/normal_5ffbefe40c6ce.pdf
    • https://cdn-cms.f-static.net/uploads/4490128/normal_5fdc1536c4574.pdf
    • https://cdn-cms.f-static.net/uploads/4386363/normal_601f39e8acfbc.pdf
    • https://static.s123-cdn-static.com/uploads/4376369/normal_5ff6b20d38125.pdf
    • https://cdn-cms.f-static.net/uploads/4497109/normal_601ffc1054986.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3c174dcb-d89b-48aa-b088-39ad60f23952/96361716305.pdf
    • http://xedidovetaw.pbworks.com/f/cats_the_movie_cast_2018.pdf
    • http://niwomif.pbworks.com/f/67430409465.pdf
    • https://uploads.strikinglycdn.com/files/ab370c64-82df-4572-8ce1-53f257685169/5477394382.pdf
    • https://uploads.strikinglycdn.com/files/3b09d913-9fa9-4a8b-b1f9-36a0316cf82a/chamberlain_cwa2000_home_depot.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deac.bin
f448bb7b8afbeaf72768e68983de84fdeeeb3aa4f65a71035ed8c54096a62bd5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAC 5608 bytes
font_01_sfnt_off0000f19d.bin
29cb675ddc8bc105ac62d65be004629e0dad12072affc9e0d681c402d4b04581
pdf-font-stream PDF embedded font (sfnt) at offset 0xF19D 11424 bytes