Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f3dada401ee2c6…

MALICIOUS

PDF

69.9 KB Created: 2021-09-27 14:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46d919e822a48b7aa0aba88086afdac1 SHA-1: 9ae7a911e66d6687a52a4cf6c47cf5c9ab5bce11 SHA-256: 81f3dada401ee2c6add06718170fbf6f6388c711a019d8143933d57fcd12d37a
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy of creating many small, distinct links to obscure the true purpose. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 4

  • 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://discus-rus.ru/upl/file/lepilafavapop.pdf
    • http://www.florentmaussion.net/userfiles/File/24876412861.pdf
    • https://kingdomdatesuae.com/userfiles/files/90513437226.pdf
    • http://yingtailong.com/upload/file/2109200218320549359ghg24vgtym1.pdf
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/guvivifokomemexevavo.pdf
    • http://rockhouseschool.com/rockhouse/uploads/files/wedoses.pdf
    • http://monarchiaerembolt.hu/tmp/78892510568.pdf
    • https://jechrina.gr/FCKeditor/userimages/file/3843125164.pdf
    • http://pekingtogo.com/uploads/files/lomise.pdf
    • http://wjcopy.com/upload/files/31431638810.pdf
    • https://dmshospital.com/mm_engg/files/17081688797.pdf
    • http://lionsmarsala.it/userfiles/files/57597953257.pdf
    • http://laros.cz/UserFiles/file/dixupawukupukonofenuro.pdf
    • https://betsin.org/userfiles/files/20722830948.pdf
    • https://kampusogrenciyurdu.com/file/23074743873.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/lagalasudigana.pdf
    • http://dailyliving.nl/ckfinder/userfiles/files/97269475318.pdf
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/firajegijomimakizuso.pdf
    • http://gt-outillages.fr/ressource/site-image/files/sukugokabufuzofi.pdf
    • http://hotel-gerard-dalsace.com/upload/document/faxisupirikutodeseku.pdf
    • http://phrabat.net/UserFiles/File/torezepazevosubekupuz.pdf
    • http://global-leasing-management.com/uf/file/24417740180.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=gta+save+game+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_off0000b0ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AE 16792 bytes
font_01_sfnt_off0000c8c5.bin
f0d39002f4727fb1b6ae4c891b239adbce8a4c4577124f00d980eacf05dae585		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C5 10648 bytes
font_02_sfnt_off0000e0fa.bin
b70fd9cfd785b194e24102edf55323895432355fd34d0efa6a25a482f76214d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FA 16232 bytes

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