Malicious PDF — malware analysis report

Static analysis result for SHA-256 28fcddb9328d523e…

MALICIOUS

PDF

91.1 KB Created: 2021-09-09 07:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3df3543ba4dd997eef24662b46ad39aa SHA-1: 4cd994e813c5b499c28c2778dfef954b7b1189d1 SHA-256: 28fcddb9328d523ecfab5c432710aefd72a39fc81b7c019801ed9b9ddf5f1b29
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many of which point to suspicious domains and are likely used to lure users to phishing sites or download further malware. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest an attempt to obfuscate malicious activity and distribute it widely.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://milliondollardesiclub.com/upload_files/featured/files/niguxo.pdf In PDF document text
    • https://ezsprinting.com/userfiles/file/xutavafa.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/zulamijazexo.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/xobalinurasagesokozig.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/voxosefesajatuse.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/zuvazajaseto.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/rovabejuwob.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/61343f561e43e.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139814550554---15381995114.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/rutokinunulutasutosub.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c6dfeb7d6---kegokido.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/38978633852.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210907032634.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/93314882222.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210908_121845.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/97985468530.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/jetasijamotuzizosowegeris.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/91844614706.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/tekadoja.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/kozejudowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=21+bridges+full+free+moviePDF 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_off00010208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10208 10712 bytes
SHA-256: c678743c5d69a6a983d29b28cde8e37b232ae47d7d42306c4fde644a6eee01a7
font_01_sfnt_off00011a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001328f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1328F 17228 bytes
SHA-256: 501a61a6149250e6799c1019a78baa2c0b4c6b293d1c66032cc7e1853538915e

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