Malicious PDF — malware analysis report

Static analysis result for SHA-256 c34f9c61b9504076…

MALICIOUS

PDF

78.6 KB Created: 2021-09-27 16:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d866b051d22b765d1cb5c54d1040f7c8 SHA-1: 124954a7b3b2ca58e91b060b85efb0ae6fa117d4 SHA-256: c34f9c61b95040762838dd24b0f84dc8234edf6803db2b64fc4dd81011eeb5c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous embedded URLs pointing to various PDF files suggests a link farm or distribution mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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 http://hmed.vn/upload/files/40691037906.pdf In PDF document text
    • http://gmicropilotes.com/uploads/files/50985298291.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/piguradipudizuwujor.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/winaze.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/35280849051.pdfIn PDF document text
    • http://aa-nusd.jp/55166197404.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/57060466313.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/84221697563.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/disaro.pdfIn PDF document text
    • http://kachelofen-prommegger.at/pewirubazaxifazadisotoza.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614f29c781ed4---xexakuvuwox.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/90028905227.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/rapiliw.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/23831690676.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/bofutezumapavo.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/6835871288.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/lurubupeta.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/gapivun.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/joxipu.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/84824668672.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/pagupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=cara+membuat+blog+gratis+di+hp+androidPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DD 15916 bytes
SHA-256: f80d2e70a7bed1371f54df71c078cc674a1f29922a7c798cc09cb20fc6337972
font_01_sfnt_off0000fa4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11262 11108 bytes
SHA-256: 45538ece6a70021f1383282be6fa20a8facfea671dd63880e0b92a6df5e76445

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