Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a85d7cb22735fc0…

MALICIOUS

PDF

77.5 KB Created: 2021-04-30 07:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f197aecab7372a1da3f89e54faa3e57a SHA-1: 64d3ebc70053e0af52e99a2eb6f671278789062d SHA-256: 3a85d7cb22735fc03d80f0a41bfa1148f28f88f8d09ec997ec4230b7abed9b35
96 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The embedded URLs, although some are marked benign, point to suspicious domains often used for hosting malware or phishing content. The document body is heavily obfuscated, but the presence of PDF_URI and EMBEDDED_URL heuristics suggests an attempt to redirect the user to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/7245eb3a1cd050028527b03b698a1f15/zanaxalizawaxepovirotan.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608609483f461---40060931860.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/5d39759ad7469311dbad2db7ec1c5f9a/balanetoxemobewuv.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160707f0f10243---62100438644.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608516ace0dca---ferorotikalub.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729f07689eb---gajimeger.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cebb2f09e---xitakabivos.pdf
    • https://africanresearchcenter.com/userfiles/file/gowulewemivojijazanagiw.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f212ec36bb---giridola.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/0f3bec128f5cfe815aa8456958fde894/zulupuxasedidijupe.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf6e56302---10377239875.pdf
    • http://www.anjhimayath.com/upload/file/funeradesibajigofurujuzab.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/874507bb093f7570795492f2663d0287/femuluforuzibetenefe.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/4927nkeschnbr8jrn709fg6m9d/7933563629.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ectomorph+transformation+female
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7d2.bin
d29954ac35d148888c4bc72e8740f370bb62af01eb6c6df4c73dac578c985378
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D2 5212 bytes
font_01_sfnt_off00010963.bin
7fc6b476c98fb0ec46fff5e34d9c56d2fba46bf0589ef5a5d4ccdee092487d26
pdf-font-stream PDF embedded font (sfnt) at offset 0x10963 11068 bytes