Malicious PDF — malware analysis report

Static analysis result for SHA-256 17aebd3ff5546056…

MALICIOUS

PDF

69.2 KB Created: 2021-05-26 23:37:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5292a1aa54318016df97260263d1aa9f SHA-1: 2c118565e008aa64fc3ed46cd3d7ead81d3430bc SHA-256: 17aebd3ff55460568b776f5ecfc54cd3df66b0344ee8d8433d758d3a3b9e2b6c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many of which point to PDF files hosted on potentially compromised websites, suggests a phishing or credential harvesting campaign. The document body, though heavily obfuscated, contains metadata related to PDF generation, further supporting its role as a 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 http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c69a7e61b7---takuwivivafoze.pdf
    • https://boumqueur-edition.com/upload/fckeditor/file/lesuzinuxamotivagipuw.pdf
    • http://hnkingdee.cn/Files/file/2021526181937.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b039ba55f0---ligad.pdf
    • http://al-bandak.com/userfiles/file/zuvobupumuroji.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160832e0bd09ea---65910915017.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/7imfit3j7ui2341g3djtssn4a0/tomazoxurerusez.pdf
    • http://interel-rus.ru/test/sites/default/files/file/xasexizodesisugowilubo.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894cd7d3c37---75596304995.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab551754cce---97140979169.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4888c27de---59428181828.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/1a83255559d39a1cf2376588e9dc2375/22875000050.pdf
    • http://maynenkhiinverter.com/media/ftp/file/tobebubekepora.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/85839828950.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/b6c2e98fe0cb6f4315bfe25954a0c4e4/1490358287.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=determining+volume+of+joined+rectangular+prisms+worksheet
    • 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_off0000cf7b.bin
66fa99a840727f0612f9aa46d808811b34f54f274cdcc2e7a77fca6dfaa1a68c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7B 5860 bytes
font_01_sfnt_off0000e363.bin
9cbafd694a88978aa5196c1b65a1adbf830e7d85ccda76e2846d7c5803e4c984
pdf-font-stream PDF embedded font (sfnt) at offset 0xE363 10588 bytes