Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e08873d15750fc…

MALICIOUS

PDF

80.3 KB Created: 2021-09-13 14:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 18baa8acafad97549fcf48bd112ac6ec SHA-1: a705aed0359dd52dac4a17440329a6f92b7a4ff6 SHA-256: 91e08873d15750fca0ef3fdd8374023a0f078f230c3601648deeea6c7c33e0aa
106 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous distinct URLs, many of which point to PDF files hosted on various domains. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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://zebcom.in/userfiles/file/pusurunadinesewe.pdf In PDF document text
    • http://teknis.it/userfiles/files/wotela.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/wotikidatexuwoxevulatax.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/ludaxutubesaj.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/lojuzuda.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/34287975631.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/72990993903.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/82552219528.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/75850080463.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/33856429466.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/jerarip.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/37389988241.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/15368527484.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/19099241878.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/99830904090.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/baduwisinexewisetubukas.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134caf312e26---39321621775.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/23290934260.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/tavepewetosibuj.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/19241375921.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/13743972138.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/kuxewozogog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=bhoomi+2017+full+movie+onlinePDF 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_off0000d6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D8 17400 bytes
SHA-256: b9128b694c929d35af56eb058dae491e964a1438879b09414c03cd89b24575b5
font_01_sfnt_off00010345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10345 10512 bytes
SHA-256: 6bef72db2fd634b04df984f23bad3cf1e80221ee9833c69d4d3889539295f5fb
font_02_sfnt_off00011b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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