Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f48af82ebc6409…

MALICIOUS

PDF

81.7 KB Created: 2021-09-19 19:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7af67665a77ad3008b4ca038e5c3bac2 SHA-1: 6d7b8c902958f8ad3c780d447330ca31136ad1a1 SHA-256: 84f48af82ebc640956c763165a5863f8fc5511290d9fd76615a6f8caa2dcc7ad
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document impersonates a cloud file-sharing service, a common lure for phishing attacks. Heuristics indicate it functions as a link farm, directing users to various PDF files hosted on potentially disposable domains. ClamAV detection and ML classification strongly suggest malicious intent, likely involving the delivery of a phishing payload or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://urparitet.ru/admin/ckfinder/userfiles/files/29596347858.pdf
    • http://haliburtonhighlandsheritage.ca/userfiles/file/34394030444.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161455ee628093---71928172581.pdf
    • http://salonorganica.ru/upload/files/neganulizu.pdf
    • http://korea-labels.com/ckfinder/userfiles/files/vuzesurofadutududovilodu.pdf
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210908065920.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/1b06c885b9e06b1fc3cd87db32a5d6e2/69472071139.pdf
    • https://rcot.org/userfiles/file/gemotugu.pdf
    • http://maekuangudomthara.com/ckfinder/userfiles/files/fibuwigigutaxugogugu.pdf
    • http://prasongp.com/file_media/file_image/file/53552504669.pdf
    • http://henanshuangxin.com/d/files/37743580465.pdf
    • http://thucancakoihikari.com/luutru/files/64682075092.pdf
    • https://mandarinkinesiska.com/userfiles/file/nikunojujutisiwedugega.pdf
    • http://a1-automotivegroup.com/upload/files/61814024213.pdf
    • https://dadesigning.com/daduserfiles/files/lajopomolabazedumabas.pdf
    • https://gbagencement.fr/uploads/file/jarupovegijoturefife.pdf
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bivinimojolepuxigexoborew.pdf
    • http://www.civilhospitalpalampur.in/img/uploads/files/lufagupenikimaduviwit.pdf
    • https://turbooto.vn/upload/files/xomidelenumatam.pdf
    • https://yp05.com/_UploadFile/Images/file/sogigegotovovitux.pdf
    • http://carbonelite.ru/file/91126356924.pdf
    • http://americansemitruckparts.com/d/files/9321596930.pdf
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/polukefajob.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=download+pictures+text+messages+android
    • 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_off0000da1e.bin
93d00fc231e5efdeea847ed689a64cdb8232ecdca1251d0a1527a5cbc8cd610e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1E 17392 bytes
font_01_sfnt_off000106a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106A1 16792 bytes
font_02_sfnt_off00011eb8.bin
2bab050d7faa4cce26a717b99c08d4b8c827b997a15b95cb830bfde1b907aede		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB8 11148 bytes

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