Malicious PDF — malware analysis report

Static analysis result for SHA-256 d65aa7edad5a96fc…

MALICIOUS

PDF

84.0 KB Created: 2021-09-16 16:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: af218fdf6a9fb894a98ca40ebc61821d SHA-1: 25302f0298db45f1b937f2023bb4d9faf52d58a4 SHA-256: d65aa7edad5a96fc3fda4960656d4fd9cc3fc46da870a305fadb92036eee2ba4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers as malicious. It contains multiple embedded URIs, including one pointing to a raw IP address, and exhibits characteristics of a link farm on disposable hosting. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly suggests a business email compromise (BEC) lure, aiming to trick users into believing there are new or changed payment instructions. No scripts were extracted, but the presence of embedded URIs indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://garglob.ru/uplcv?utm_term=periscope+live+streaming+android PDF link annotation
    • http://abwingssuffolk1.com/uploads/files/vijonaxabunogijewot.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138b8f7a7ff7---didajosegoxuzijobubovezuv.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/tigufevemikitosede.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/favisopekugapagumilaras.pdfPDF link annotation
    • http://alfadent-volg.ru/images_uploads/files/35569628183.pdfIn PDF document text
    • http://congchungnguyenlieu.vnpec.xyz/uploads/files/22550023033.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/durisenalupizudazilowef.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/darusexuf.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/juvetajutivi.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/semofokatupegozaxej.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/20792906560.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/fecf3b361a0c17e1dc784e279b63320c/23468459042.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/82922374494.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/direfetugobez.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/duzitekigebifuxusida.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/jepulapinuminepuwosos.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/13636286328.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/kotugukol.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/2179382025.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210916_125314.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/xezawuvedemut.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/bobonowom.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/60081823458.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/87073869633.pdfIn PDF document text
    • 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_off0000e258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE258 10924 bytes
SHA-256: 1abc5a77a72bdd26e16e646ac017923810b94ea64e64fded3d52ad2a703e7562
font_01_sfnt_off0000fb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB75 18044 bytes
SHA-256: 6b12b8bcf352b26f1c54218121a5f6b03b1e224eee576a7e3521bfc1537411b5
font_02_sfnt_off00012a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1