Malicious PDF — malware analysis report

Static analysis result for SHA-256 50566dea8c5ffdbd…

MALICIOUS

PDF

84.6 KB Created: 2021-09-22 16:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 18762b7390c2c0a14213f86806df2950 SHA-1: 593b570fc8fa579ff3e9253d7750aaa84b228443 SHA-256: 50566dea8c5ffdbdba8031d3b2d8348ec5250176cd5357ad128847816f057458
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The document body is heavily obfuscated, but the presence of numerous links to PDF files on disposable hosting suggests a link farm designed to redirect users to malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically points to this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hoanggiaphatland.com/uploads/image/files/416880554.pdf In PDF document text
    • http://dvif.fr/userfiles/file/18970039270.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/siposetadodubu.pdfIn PDF document text
    • http://djapm.com/userfiles/file/43395261483.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/daxepibesabus.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b5cda90eb---sijufitisavolumajup.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/95915693756.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/579392082.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/e071db1eedbe8da94b8e091a92467473/17890136614.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/wegifiw.pdfIn PDF document text
    • http://ume.civilkozpont.hu/uploads/file/wizegikiwosemevuwakijo.pdfIn PDF document text
    • http://szpk.hu/_user/file/46393397625.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/nogodibadokejipimeket.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/foxorezor.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/96506533846.pdfIn PDF document text
    • https://vleek.com/uploads/files/todevejuk.pdfIn PDF document text
    • http://capableapp.com/uploads/files/16754001100.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/22544105306.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/4149103512.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/mikaxumupusizu.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/62790153967.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/20089315758.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/bigugizuzufowaxosurojasow.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/senumovoxuxukali.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/wupupawadujigovaxaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=minecraft+story+mode+apk+free+downloadPDF 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_off0000e5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B9 17176 bytes
SHA-256: 9341e5dc711b14a230d10e393e17e75dbc671e3ab6a03d78908ff25d2237bd29
font_01_sfnt_off00011280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11280 11068 bytes
SHA-256: 22962857d04e30b7a760fa6a71d8b754825cbae8cd52d826cdc769e2e872184b
font_02_sfnt_off00012c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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