Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a1c8a41318faf4…

MALICIOUS

PDF

69.5 KB Created: 2021-06-20 04:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 371f12b61b7c229ec291a9ca66b0e8be SHA-1: 6ecf41a405333691eb9ce6a28f2e3b1488d769e0 SHA-256: 05a1c8a41318faf45ad700e8a72be6d1e6b420ccdd697a74e0acab3d16b064e8
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by a ClamAV detection and an ML classifier, indicating it is a phishing attempt disguised as civil engineering notes. The presence of multiple embedded URLs, some pointing to potentially compromised websites hosting PDF files, suggests a download lure. The document body is heavily obfuscated, preventing a detailed analysis of its specific content or intent beyond the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079105666c8c---72174381819.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/ffea497e7545658a10888c89eebcd366/puxetiwogazezugopakiwo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094249d05dbf---27550170725.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c216e9bceed---difevegidoko.pdf
    • https://drvishweshwari.in/userfiles/file/popasiledulumanuriras.pdf
    • https://thaiwoodengames.com/files/upload/files/89594182893.pdf
    • http://asbu.net/uploads/FCK_files/file/zijota.pdf
    • https://tantecoccole016.it/file/libotimapupajo.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/cf8d420a12c07fe2019f1048267bc86b/11648681253.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0e535b7d8---18307435578.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/42li6svovv2achnkvv1ejd2bv2/lamixejupepoda.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/c07c9ec697ec73e81b4d6ac47e807974/23625005428.pdf
    • http://vorne-sitzen.eu/pcms/content/file/zopenukol.pdf
    • http://kartywspomnien.pl/uploads/assets/file/41919993971.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/b8cc38733f2c551477440f111713b7de/78505064676.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33bb7a247a---savofomafajex.pdf
    • https://ascinfratech.com/clientprojects/trading/file/woxeporedazefopomumubazem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=civil+engineering+surveying+1+notes+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_off0000d285.bin
46dab3baee47430e085a0cd1f63420e8fc3d00d65aec7a94dd08d7bfb1b8e6ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD285 5116 bytes
font_01_sfnt_off0000e418.bin
1392b36ba07c5f5a45343378d7b1ad4de7c1a5eea15658237823c9ad350b5cb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE418 10828 bytes

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