Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d7899389e153d7…

MALICIOUS

PDF

71.1 KB Created: 2021-09-26 09:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1824c4eab274a5f8e0468aa135b52e57 SHA-1: c0e9acff3e1555c72990c6d5ed0762a6a9738b07 SHA-256: 82d7899389e153d7cd9ea1a4308531d84f164bd71a42419d358168b36f1b06be
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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=because+of+winn+dixie+ebook+pdf PDF link annotation
    • http://www.thaitofu.com/image/upload/File/marugofafotinolitoge.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lsoi7h52p6re41brmii49pnfp6/30140028619.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/zapidifidaregereteguzarem.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/diruvabivuxaxudu.pdfIn PDF document text
    • https://zzhqhi.com/d/files/xoladazef.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/pumunodawowurenubevadifo.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161337c108d275---jolesuxapajimuwubuworaxep.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/49319981705.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/gamivumizuto.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/jasaso.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/52985612710.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/batijumatobowijamaxotodep.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/zimebivulugeb.pdfIn PDF document text
    • http://eichler-kammerer.de/86379851362.pdfIn PDF document text
    • http://coffee33.ru/archive/file/44871091637.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/91149747996.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/fukoz.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/nukakojifibijanexidok.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/55217367547.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/69329284290.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/20986544729.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_off0000b163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB163 17368 bytes
SHA-256: 5a72cffff9ec2a7ae4d1c7fc6313fc67eba9571967ae37f6a90d92704a240529
font_01_sfnt_off0000dd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56D 10944 bytes
SHA-256: e424c2bf9cb4cf6ed57f5cb9c6088285a3b4815c1b42b3c2532e39faaa024608

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