Malicious PDF — malware analysis report

Static analysis result for SHA-256 464dedd6c15a499c…

MALICIOUS

PDF

79.1 KB Created: 2021-09-17 22:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aef0f328354f2d756e93ab07bb6b8610 SHA-1: 2372059c1b658aeea379edddbbfe0f1f1d905fa3 SHA-256: 464dedd6c15a499cc34d9a475fcff0a8b851474a1992505bc68711fd54bdb630
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 embedded URLs, many of which point to suspicious domains and appear to be part of a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://kvrhousing.com/uploads/penur.pdf
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/74166047979.pdf
    • http://abwgulfport.com/uploads/files/72820404403.pdf
    • https://psihodesk.ro/ckfinder/userfiles/files/vegubag.pdf
    • http://ilovehikari.com/uploads/files/fudotozimajagugumovukevas.pdf
    • http://n3ss.ro/ckfinder/userfiles/files/65713799489.pdf
    • http://hndgyl.com/v15/Upload/file/2021912171125018.pdf
    • http://dalaichau.com/files/natobo.pdf
    • https://kenkochaya.com/user_data/ckfinder/files/84116826902.pdf
    • https://skywaynepal.com/userfiles/file/jiwilegamujunu.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/di3cc4cuoamhebcdb5fmsahucu/lujenisaxeludezogafinib.pdf
    • http://kenhuffbuilders.com/userfiles/file/xexanupugadekuxed.pdf
    • https://oxi-dental.ro/imagini_ws/luvef.pdf
    • http://dienmaythanglong.org/uploads/files/24965260226.pdf
    • https://manhremhoangvan.com/wp-content/uploads/files/27300554506.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613521a7d9ed6---menomububafik.pdf
    • http://bsa.by/ckfinder/userfiles/files/19697384413.pdf
    • https://hinodecoder.com/userfiles/file/nokesoz.pdf
    • http://nato-denkmal.de/uploads/file/42961578865.pdf
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/46353258999.pdf
    • http://be-now.pl/userfiles/file/dopil.pdf
    • http://katour.ru/admin/ckfinder/userfiles/files/siloluwojasozeluw.pdf
    • https://littleitalypizzany.com/nbloom/fckuploads/file/fugojifugotaminezategili.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=on+my+own+piano+sheet+music
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d24a.bin
038f7254065db1913b399f4d76904920804ef86c16c816fc95b539d9e24e191f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD24A 16756 bytes
font_01_sfnt_off0000fda4.bin
da93865112f1cf4ec738df6fa5a6ea601ff31a505a691d82585cfbd8448ce2a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA4 10816 bytes
font_02_sfnt_off00011690.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11690 16792 bytes

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