Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd725528b03f3ba…

MALICIOUS

PDF

74.1 KB Created: 2021-05-09 09:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1276417e6fde9a8e1a1d88d53b48b497 SHA-1: 9aa3ab08517f8214c7ff018060bd8315d10625f3 SHA-256: 1cd725528b03f3ba7a407f216942f7d1e26c2e725f4796d7be4d8b532977b024
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains multiple embedded URLs, many of which point to potentially malicious PDF files hosted on compromised websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was heavily obfuscated, preventing a deeper analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/23b25ab8d9bbd771f4a23000455ded2b/josexafulebizadosunat.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607501fc976c3---8778817970.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/a2351d34098dc00747013b461c66ae69/xekogi.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074468450a7a---88173885042.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ffc8c2261f8a37c62601dcb86a5eb3e7/kudazudimutugebur.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/9324bdc0490076972f7ed588399f0358/kajorajupuf.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8a4e949cd---14047512763.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/1c52ab1d89b29663ce8bc4a43cc72eff/kibukutokilusu.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/2eta9hn7fqmgmppptniea1tbud/tazobusivolexalusojolefe.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607934436e6d7---95326243330.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/da7c27bd446bfd95c16b0d09337500df/voxifebatak.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/118dbce3f45b91fb1efd2b6fb5e8bdd9/bokisogabita.pdf
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/a6ae2794253430c9a07d51bb78e1025f/96429484069.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=reporter+meaning+in+marathi
    • 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_off0000e55b.bin
77ea8ac538de158e688156695a52c099c3e0034b771a90745524a08e22d3652e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE55B 5032 bytes
font_01_sfnt_off0000f651.bin
ac65714dc603952002ed2680d66484c34a0da87618bfbeedb2e688830ed2e174
pdf-font-stream PDF embedded font (sfnt) at offset 0xF651 11532 bytes