Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c55c9faf04fca9…

MALICIOUS

PDF

88.3 KB Created: 2021-09-21 00:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7435318c9f8cfa87e507942bc688b60a SHA-1: 5668e92996b84025275420cfab214b703357319d SHA-256: c0c55c9faf04fca901e11d7feef85b12bdcf715e589cae95a0c8ee85fe047e1c
166 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly suggests the document's purpose is to trick the user into installing a fake browser extension or update. While no scripts were directly extracted, the presence of numerous external URLs and the nature of the lure imply a multi-stage attack, likely involving JavaScript execution to facilitate the download and installation of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://huntic.ru/uplcv?utm_term=dark+app+android
    • https://dptech.vn/uploads/files/14558808820.pdf
    • http://medob.org/SITE/files/editor/file/50752176484.pdf
    • http://www.propper-droppers.nl/files/file/762695729.pdf
    • http://scea.edu.mn/ckfinder/userfiles/files/mafexunazivu.pdf
    • http://leadingedgecorporate.com/user_images/file/18226922356.pdf
    • http://cisseo.net/userfiles/files/mitinunepapinofokim.pdf
    • https://ecodiagnost.com/ckfinder/userfiles/files/43308901555.pdf
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/43770170033.pdf
    • http://cuboni.com/uploadfile/hong202109062246103812.pdf
    • https://unifor975.ca/userfiles/file/73082878650.pdf
    • https://weishinclinic.com/uploads/files/202109201616471257.pdf
    • https://ezokniga.com/uploads/file/lepufutikukowise.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314541a0ce3---liwezuniwowakidur.pdf
    • http://dezmaster.com/userfiles/file/kizixavenelemagepupor.pdf
    • https://jmclimatizacionhvac.cl/images/subidas/file/naperewureduvebobe.pdf
    • http://kyokushin96.ru/admin/ckfinder/userfiles/files/kudotizapamadaruwisuzib.pdf
    • http://gzsjlt.cn/userfiles/file/muxon.pdf
    • https://cs168.tw/upfiles/editor/files/21487175736.pdf
    • http://kxzyjy.com/CKEdit/upload/files/wukimeviko.pdf
    • http://thewellmanteam.com/userfiles/files/16156976013.pdf
    • https://krusomying.com/data/file/soxobuluzojopofiji.pdf
    • https://aalatour.com/basefile/b2caalatourcom/files/69047863163.pdf
    • https://solturism.ro/images/file/febalakekoxokisiviv.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_off0000f739.bin
fb9dc63071265eab4f24aeb69e328ecfedd005c53569ab4b7ca6b3fd1abfb215		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF739 17680 bytes
font_01_sfnt_off00012557.bin
f087d433709b1c3fc7fcbb0725a53e50adcbf839a8755a8419d7648e5f0141d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12557 10032 bytes
font_02_sfnt_off00013b99.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B99 16792 bytes

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