Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68453eaa20fc177…

MALICIOUS

PDF

88.3 KB Created: 2021-09-16 15:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 51fbb84adec75fe16612030b6287e8e8 SHA-1: 495a94818e5e8ebc80d519c2e8189bae05f579e0 SHA-256: c68453eaa20fc177e8b2721213271f84d17d417bb06ea4be5fc110fa6b16fe88
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cottonweb.net/userfiles/file/sokifa.pdf In PDF document text
    • http://ichieh.tw/uploads/files/202109081301399210.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/86930706048.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/38994196990.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/89269117755.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/sozejamezowuv.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/bikesazogob.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/64478588076.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/30608176928.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/fozewizipukowixopa.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161412985a6e64---fidinonagaditameker.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/lamuwavekatufupoxaxasisa.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/jujakelason.pdfIn PDF document text
    • https://togeltop.net/contents/files/luxefulo.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/nowugaraxetogikapapezuzal.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210903062708.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f63d67c153---51129393117.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/sixino.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/84568865721.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/lasejafezifinori.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/39719847804.pdfIn PDF document text
    • https://amgaa.org/temp/files/venewinapumerejukuv.pdfIn PDF document text
    • http://195exim.com/datas/files/58003198409.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/kepepinopilaviduboba.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/37434962324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=turn+on+screen+when+notification+received+androidPDF 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_off0000f468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF468 17456 bytes
SHA-256: f0a14f6292c2a32c116cbe27f336e547c904a3533e623cacaa6161f92abf54d0
font_01_sfnt_off00012231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12231 10744 bytes
SHA-256: f6b43a62f26a1df1d01c810890a03dd845d1850bae17ec9794789ad84076c585
font_02_sfnt_off00013af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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