Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1c08d56219ecec…

MALICIOUS

PDF

78.9 KB Created: 2021-02-07 00:41:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bed1322729bfc38d8f31cc00d49599cd SHA-1: b85022262e879ae1ae421dff0787170122f3e750 SHA-256: cd1c08d56219ecec4887fac9ef16d2c98ee2a7aa1258382b2ed2247f7afdf383
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1553.005 Security Software Installation

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains multiple embedded URLs and exhibits characteristics of a link farm, suggesting it's designed to redirect users to malicious content. The document body, though heavily obfuscated, combined with the 'SE_SECURITY_BYPASS' and 'SE_PASSWORD_ARCHIVE_LURE' heuristics, indicates an attempt to trick the user into disabling security measures and downloading a password-protected payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seumenha.ru/wb?keyword=bittorrent%20pro%20apk%205.%203.%203%20free PDF link annotation
    • https://cdn.sqhk.co/tefupudoma/apifbmK/live_football_scores_ncaa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365653/normal_5ffe798a5557d.pdfIn PDF document text
    • https://cdn.sqhk.co/fojilude/joI5dhf/31383290342.pdfIn PDF document text
    • http://bukuvud.22web.org/anarchy_online_guide_2017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484355/normal_60109cb297ff8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383460/normal_600750f754334.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446152/normal_5fedf0906d099.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501791/normal_6000a03c05d76.pdfIn PDF document text
    • http://fitokaps.xyz/xedoxdcz5n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489615/normal_5fdc168340794.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486037/normal_5febf0be07198.pdfIn PDF document text
    • http://usechambre.xyz/xazopuwesosasanozawufuz19nj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://livajurusurex.epizy.com/laxodufesexisifutoge.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/69078502850.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD754 5120 bytes
SHA-256: 6f62cde2c7618117718d0d86e24055dc26e255aaea2cc0204f4b5de0ab330c11
font_01_sfnt_off0000e8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DB 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000f168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF168 11596 bytes
SHA-256: e4ed3c73d301d218d4b040119aa7e2de8e696019e3c50f625d4cccd3ed80a664
font_03_sfnt_off000118f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F6 16144 bytes
SHA-256: f0a8b786da721c7415a59d91fbce3b20bbb98ea32e48857ac1ff22d53b00ec29

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