Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb732e8e818ed0a2…

MALICIOUS

PDF

78.0 KB Created: 2021-09-23 23:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 36bd587dfcb32d3dfdc5797d25905335 SHA-1: a3c4f705a2229b7f4d6be1f31d8a7e77feb475e8 SHA-256: cb732e8e818ed0a2b249bcfc063a8c4ef1bf0b7a23107c8d47324b283c89df11
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable or unknown domains, characteristic of a link farm designed to distribute malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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 https://galaxytraining.examinationonline.com/files/81759822631.pdf In PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/35839136948.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/b10ae8bf5ae96ec517d961ef23953439/7918501406.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/85331088871.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/28263913120.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/suzufazuxatofuguwubijojo.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/mixit.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/35400612837.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/pagodusupozeponag.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/soxokute.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/notadijolukodi.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/32372175991.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/36339264.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/jevejokigupabigazulegol.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/66937975241.pdfIn PDF document text
    • http://dasbluemchen.com/sufajeboxukataxazi.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/80744566854.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/42049853283.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/menajasamefozopodunuxo.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/gebexubu.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f91e24062---69219506964.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/85305480253.pdfIn PDF document text
    • https://cabinetscounters.com/ckfinder/userfiles/files/sutori.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/56978059267.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210910002108.pdfIn PDF document text
    • https://phunhai.net/upload/files/98141010142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=list+of+positive+words+that+start+with+bPDF 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_off0000cce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE6 17248 bytes
SHA-256: eeadbec3c06d276fe04f6a08c7d7b13020ba4cbcbb49e650e076413e8af6e028
font_01_sfnt_off0000f9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BB 10692 bytes
SHA-256: 451a06f445d20b69bf1c9d46eadb2b0046d71ec70811c8fdc6bbf30e84d729f2