Malicious PDF — malware analysis report

Static analysis result for SHA-256 48e7527c87dc28d9…

MALICIOUS

PDF

71.5 KB Created: 2021-09-15 23:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78aa17f4428e8dbcb2f16d6a01bf4986 SHA-1: 5fcf2ac0dfbb7df90e81e8fadb5e7222a38fdd88 SHA-256: 48e7527c87dc28d9d521cdf9d87f7885ec73431d881715040b1587f680f23136
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://garglob.ru/uplcv?utm_term=react+native+android+release+build
    • http://monteconsultants.com/image/upload/File/27831478265.pdf
    • http://aedjtjdshbf.pretty-match.com/upload/files/75017162160.pdf
    • https://bkairconditioner.cloud4demo.com/uploads/files/wekezuwomat.pdf
    • http://nena-artspace.com/ckfinder/userfiles/files/ruwixis.pdf
    • https://infotechloyalty.com/bot/ckfinder/uf/files/1352314973.pdf
    • http://parfumland.sk/upl/49016107830.pdf
    • http://satthachkhe.vn/image/file/6633769577.pdf
    • http://daiichibus.vn/uploads/news_file/pavupilete.pdf
    • https://polenhosting.com/calisma2/files/uploads/13498523188.pdf
    • https://anfauglir.com/images/file/46399133177.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/094c4643ce9d5f52be46dc6274d3aff6/kosowubibowugokemoxebusuk.pdf
    • http://raffaelecavazzoni.com/userfiles/files/mewatupuzakadifex.pdf
    • https://easternresources.net/ckfinder/userfiles/files/21260067973.pdf
    • http://gps-tw.com/CKEdit/upload/files/54684687104.pdf
    • http://nhatminhtrading.vn/app/webroot/uploads/files/resaxepefakomewolimikik.pdf
    • http://mascotdd.com/file_media/file_image/file/31785798696.pdf
    • https://freebcard.com/ckfinder/userfiles/files/funuxuwiveligotonurukev.pdf
    • http://aotwcasino.com/ckfinder/userfiles/files/84297758291.pdf
    • https://marmetal.cevhertemizlik.com/userfiles/files/kiwuzumojirifa.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613082813d536---13510773318.pdf
    • http://kapsalonindex.nl/images/uploads/fipidareri.pdf
    • https://www.utn.ac.cr/sites/default/files/files/95539120950.pdf
    • http://detaycopymatbaa.com/userfiles/file/1188273531.pdf
    • http://eventclub.pl/userfiles/file/pajilabepixuruv.pdf
    • https://aymsoft.us/aym_image/files/37008927622.pdf
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14312274726.pdf
    • 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_off0000b758.bin
f0087195e0969270dec5602b82cabaa418e12a5e899e09301d82de7b2bfc80cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB758 15460 bytes
font_01_sfnt_off0000df27.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF27 16792 bytes
font_02_sfnt_off0000f73e.bin
87d807f8a985d9111028ac6ffbd68db51d277c1adb124a3ce62a5a336a49de62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF73E 10712 bytes

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