Malicious PDF — malware analysis report

Static analysis result for SHA-256 23fc683d1fc06ff7…

MALICIOUS

PDF

74.2 KB Created: 2021-09-16 05:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0cf3b1f306f00da925f40007f4710b18 SHA-1: 18dda253bce1edc3e3853ba8a3d16f6a58f2ca1c SHA-256: 23fc683d1fc06ff739df8771a60906a52702b8049bd2a43b15820b16685403f1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan distribution vehicle. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the overall structure suggest an attempt to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://catamma.ru/uplcv?utm_term=gangstar+4+hack+download PDF link annotation
    • http://avtokapriz42.ru/userfiles/file/rinawuwovisilalewuvebo.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090210361848.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/50114065612.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/1334017957.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/92443803243.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/mosobuxit.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/vofimol.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/39590392035.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/zivevowe.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/7220ee71099874ba176d6774cd45b16a/30025299416.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/kekojin.pdfIn PDF document text
    • https://campermagazine.tv/public/file/59382315728.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/lukutonavezakujozoxofowut.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/89107503956.pdfIn PDF document text
    • https://hinaweb.com/upload/file/88336776309.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/jutunazuwuzesarorinig.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/16782642985.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bitifel.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/sudezejumozerixekojiso.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135157146c4b---71966998064.pdfIn PDF document text
    • http://artospace.com/pics/file/vejotipus.pdfIn PDF document text
    • http://cqhuaan.myhost360.cn/upload/files/09-06-17-12-46-87.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/tezefuzidorejele.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_off0000c105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC105 10720 bytes
SHA-256: 6517a3c9fbd664ab92e30e51aaaf1f630aa5b580198289c06fe623db14bab6e7
font_01_sfnt_off0000d986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD986 16240 bytes
SHA-256: be3caa679c3233f4edee4d45c4a42ff7dbd7e616c47526227ea924e3f266a481
font_02_sfnt_off000102e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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