Malicious PDF — malware analysis report

Static analysis result for SHA-256 638bc14efd76b91b…

MALICIOUS

PDF

77.5 KB Created: 2021-03-15 12:30:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b31eeca6cd8e7ee7e69ae0bee98ae99 SHA-1: d1849784da269749ba5706ed5fd2bc77769cb735 SHA-256: 638bc14efd76b91bdedc49dbe11935fff8803895f0f680e6ff8623b698281e1b
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous external links, with one prominent URL pointing to 'xezojetit.ru', suggesting a phishing or link-farming attempt. The document body, though heavily obfuscated, contains text related to 'CMS hospital billing guidelines', likely a lure to direct users to malicious sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xezojetit.ru/123?utm_term=cms+hospital+billing+guidelines
    • https://static.s123-cdn-static.com/uploads/4500453/normal_5fc7d4f6f3026.pdf
    • https://cdn-cms.f-static.net/uploads/4474977/normal_602e55113f238.pdf
    • https://cdn-cms.f-static.net/uploads/4418567/normal_6048a715b95e7.pdf
    • https://cdn-cms.f-static.net/uploads/4505102/normal_601750a5d4260.pdf
    • http://cheapkeys.site/icici_bank_full_information32qve.pdf
    • https://cdn-cms.f-static.net/uploads/4369336/normal_60402b6027605.pdf
    • http://sk-anker.ru/neopost_is200_series_ink_replacementr9kg3.pdf
    • https://static.s123-cdn-static.com/uploads/4384650/normal_5ff5e9050c404.pdf
    • https://static.s123-cdn-static.com/uploads/4427300/normal_6004b39c9ed61.pdf
    • https://cdn-cms.f-static.net/uploads/4383147/normal_60418282167fd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/92a6a478-90fb-4eca-8308-e754b996b1f7/formula_para_calcular_area_y_volumen_de_un_prisma_pentagonal.pdf
    • https://uploads.strikinglycdn.com/files/af4fbf6e-d9d4-477c-8a8f-f75f01de3333/62496353364.pdf
    • https://uploads.strikinglycdn.com/files/5b401807-27da-4673-a416-482ca968c022/tascam_dr_40_manuale_italiano.pdf
    • https://uploads.strikinglycdn.com/files/c8fbee23-a528-4925-aba9-95c973c4d78c/what_size_is_after_3_16.pdf
    • https://d872ce2a-2baf-4032-ab86-ab75b2f66d52.filesusr.com/ugd/338562_6232c1167c744b54808a3136085c5667.pdf?index=true
    • https://uploads.strikinglycdn.com/files/17038eb9-a0ba-4130-8898-b92571aa07a5/mafurukowugiduxekavog.pdf
    • https://uploads.strikinglycdn.com/files/4be553a6-f2db-4ec9-be8f-71205e9f53b9/50_ways_to_leave_your_lover_drum_sheet_music.pdf
    • https://b4095e1f-5e43-4c35-8b28-ff0c3185c247.filesusr.com/ugd/9cc3de_0f48b5ea668844d49b13e24c2a4dbb0d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4bb3d028-f2fa-4879-86a1-f9399ab45107/wifubajerakomugurexegi.pdf
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_5e70be6072fd4361ba93f95972b60a27.pdf?index=true
    • 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_off0000ef61.bin
9961b6b15bc2aa04d37d616d6f335ca9bd574fe1067dea87ae60e4bd51113b7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF61 5324 bytes
font_01_sfnt_off0001014b.bin
23b04155ec73d1bff0bd7c0ae51dd4ce89f671b0c8da4b114f0e11663d534f27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1014B 11040 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.