Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ab2bc4ad3403cd…

MALICIOUS

PDF

72.9 KB Created: 2021-09-22 10:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ba674b9234c53ab3de9368af0b75f9d6 SHA-1: 17f29591c07cbb3bc2e6ef4aa32eba757d767712 SHA-256: 72ab2bc4ad3403cdb381d3512c3026c9362fa53709c4795742b3974a308950b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting and using UTM parameters, suggests a phishing or link-farming scheme. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://inwebjor.ru/uplcv?utm_term=wifi+passpoint+android PDF link annotation
    • http://koreaseals.com/ckfinder/userfiles/files/kojidilomebupepanibila.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/lokitukumugotebixepizogij.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/8266320663.pdfIn PDF document text
    • http://strandedtattoo.net/file/kivoxo.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/41976196465.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/33759493329.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/vomebuwedura.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/65393721274.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/51902828845.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca6d292c8c---51772042992.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/37527994331.pdfIn PDF document text
    • http://agrion.org/upload/fichier/16204753723.pdfIn PDF document text
    • http://th-hl.com///upload/files/7875877894.pdfIn PDF document text
    • http://iscelenie.info/files/file/tunabosivupovazusekurer.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210915235712.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/lejojomofibu.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/56732353841.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/25267395878.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/bujoxi.pdfIn PDF document text
    • http://sentai.cc/data/file/20210917_084829_498.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/dipajabolumetilex.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/rigojobij.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_off0000bb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB19 16820 bytes
SHA-256: 1bc8a163ecfd23326518f9d010c4ea4cd96f4ddb096225ad36aa0bff822010bc
font_01_sfnt_off0000e67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67D 10304 bytes
SHA-256: 27475d5c4637ab1e8818b79cb449c86bee6111c766dd1dfd2af65c6addaa7a89
font_02_sfnt_off0000fdd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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