Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ee125c6e8ceb2f5…

MALICIOUS

PDF

77.5 KB Created: 2021-10-08 02:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 14238d1db3f502737e1ce282c1ea3fb4 SHA-1: c0f6c0d1a2c1d75d496d2d7cd68f93db5894eb0d SHA-256: 9ee125c6e8ceb2f5ac0ffe86a64dd1827c32b06c8fdf7e09f989959de07f5979
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 suspicious domains and structured as file downloads, strongly suggests a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying a link farm on disposable hosting.

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 http://vln.nl/files/file/mokom.pdf
    • http://www.hangmandigital.com/files/file/71577950289.pdf
    • http://demirlermetal.com/resimler/files/godazesegeviniwomi.pdf
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/29002704152.pdf
    • http://dentistturkey.com/image/files/zatogidagesupibimeniduw.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/a392c87f5189cac686d1bb9161b0d799/84687326220.pdf
    • http://matsonconstruction.net/userfiles/file/gebobugojipobejodubosum.pdf
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/xakobosirogi.pdf
    • http://dreamsurgerycn.com/ckupload/files/5430521464.pdf
    • http://ateliergermain.net/sites/default/files/file/rinegotulolexabigunosik.pdf
    • http://yasaitogo.com/uploads/files/3163446650.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136034d8999e---18855570103.pdf
    • http://isagenixmakessense.com/ckfinder/userfiles/files/kusuvazef.pdf
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/narukefozulokivoperowofi.pdf
    • https://ksuskalology.com/images/file/2731928291.pdf
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/vokituw.pdf
    • https://anandalaya.in/resources/file/43999744082.pdf
    • https://highlander-inn.com/assets/userfiles/files/15523919477.pdf
    • http://bio-scan.com/userfiles/file/lupotevapowavesarekiri.pdf
    • https://tasleemdubai.com/userfiles/files/madiw.pdf
    • http://veszpremlizards.hu/_user/file/xugiwilafuba.pdf
    • https://openkomm.yussfone-crm.com/userfiles/file/68068068777.pdf
    • http://sinostandards.net/upload/files/lemaluxig.pdf
    • http://lumieretvie.com/userfiles/file/momikenujixevujub.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=small+bump+in+white+of+eye
    • 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_off0000cb48.bin
326a90ecd1a4c3b5e5852313affd5d822d1c812abc2722ebe043f2b855c677cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB48 17240 bytes
font_01_sfnt_off0000f7ad.bin
c7b049bdbaa200eb4cc0ae8d0a38403acc0b633d3e348671a9c2c9daed57591e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AD 10872 bytes
font_02_sfnt_off00011071.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11071 16792 bytes

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