Malicious PDF — malware analysis report

Static analysis result for SHA-256 543d4488965830ce…

MALICIOUS

PDF

69.2 KB Created: 2021-09-14 03:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 53a1a8ff08c105c24cccba4ae42ceaa4 SHA-1: 431f87a4a5660a3dd300017c8f2714d0d905e4aa SHA-256: 543d4488965830ce210ca60301ec085f37cae07dd035654fb083f77f419e2c0a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, and is flagged by ML classifiers as malicious. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document's intent is to trick users into downloading a password-protected archive, a common tactic for evading security scans. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's part of a phishing or malware distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://eminencesolutions.in/resources/userfiles/file/wilorizajoxelo.pdf In PDF document text
    • http://www.tivafa.hu/upload/file/nimuwabazaj.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/paxuvigixogefaribepewazo.pdfIn PDF document text
    • http://knauto.com/upload/file///vefapiguju.pdfIn PDF document text
    • http://snft.ro/media/file/70771004205.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/bupawaladokonuxov.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/42845141071.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/pepuwelusadili.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/81736626789.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/xixavifesebatubivikofana.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/nexatatigujefesinagavi.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///42130827895.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/kakegozifaxiwaduwi.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/12115064865.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cac3ed290---14099442230.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/92887570244.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/sazufisonitibupoka.pdfIn PDF document text
    • https://2winit.com/Files/files/suxilubumigititelox.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374931a7428---renogupafupij.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/nogodiwop.pdfIn PDF document text
    • http://hrudolf.com/userfiles/bijasitemasumutokugoxep.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/73885218254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=can+you+view+private+igPDF 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_off0000b026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB026 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83D 10612 bytes
SHA-256: e5984ab69154d50163c4911d4e8915a8c1707c36732e1411795447fccea618b6
font_02_sfnt_off0000e0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B8 15376 bytes
SHA-256: 985f2290a698c6f7f611712dcf1f985e08d53058b3ab7b146c3211529a53e563

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