Malicious PDF — malware analysis report

Static analysis result for SHA-256 a399b207c97ae208…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 06:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2c6b89e7387dc9a0507a673355da08f7 SHA-1: 6a6640968c7903d58c38e155da89c063930eb585 SHA-256: a399b207c97ae2088a6036fd0157f17de9cf40df6e011663b573d55d666ff3ed
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many pointing to disposable domains, indicating a link farm or phishing attempt. ClamAV detected this file as Pdf.Phishing.Trojan, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports a malicious classification. While no scripts were explicitly extracted, the presence of embedded URIs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2647

Heuristics 4

  • 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
  • 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://koryosushi.com/uploads/files/83632678700.pdf In PDF document text
    • http://anm-av.de/uploads/files/23103145319.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/819f591d1ade92fcd8abdc47e9ac057a/fizuzokusa.pdfIn PDF document text
    • https://31app.com/userfiles/file/27387340538.pdfIn PDF document text
    • http://ortosprendimai.lt/userfiles/file/virepis.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/zikolokutojuse.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/18290218350.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/sibabajedozosik.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/18302767098.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/27098759026.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/37164150073.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/37811407147.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/javar.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/71203436748.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/rudilazejipuvet.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/89069237158.pdfIn PDF document text
    • https://dafelia.com/files/52257904877.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109112311099179.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/kunupoxewizonaka.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/gibipanutuxoxigevufopaw.pdfIn PDF document text
    • https://edex.co/userfiles/files/45399335834.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/85438637969.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/betuj.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/nesep.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/xofopepe.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131c4af376ea---tevejikejemasazeromevid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=pubg+ipad+apkPDF link annotation
    • 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_off0000e7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BB 10132 bytes
SHA-256: 171c9e534b5c019dce940fbba0f2a06fe8e2aa545c47ed9507e76b522a352a75
font_01_sfnt_off0000fdf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF7 16960 bytes
SHA-256: 4af7b9062c8c5d0ec8a831bed473b979a34a17153c252ff2f17148d48c108b2b
font_02_sfnt_off000129f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1