Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2a4659c202b2715…

MALICIOUS

PDF

80.3 KB Created: 2021-09-21 00:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 96812bdd92f3f192567298c2627745ec SHA-1: ad2b91b8d07e9ab13e335943dfb2ff817a0f9db5 SHA-256: e2a4659c202b271558bad63c1532102827e14993ef8b05ce0abdf117130ee219
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm, pointing to numerous distinct hosts, which is a common tactic for phishing or distributing further malware. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ambient-interier.cz/files/files/zaxupuxiloxagepemegazibil.pdf
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/91074024223.pdf
    • http://auroraenergyproject.it/userfiles/files/83247229091.pdf
    • https://biroestarsa.hu/uploads/file/82273424539.pdf
    • http://hong-tour.com/FileData/ckfinder/files/20210912_30778E0F9DE768D2.pdf
    • http://goksirkrupskimlyn.pl/img/upload/files/33567220964.pdf
    • https://monyetjoget.com/contents/files/suwuv.pdf
    • http://domplus.su/userfiles/files/99139792156.pdf
    • http://weddingdove.tw/uploads/files/202109130711347314.pdf
    • https://esvigo.com/upload/files/11462907919.pdf
    • http://111-orte.com/testarea/cwsCMSlight/media/files/gadanubewavofazalotalose.pdf
    • http://keystoparadise.com/userfiles/files/damazuvejolorugi.pdf
    • http://articolo17.it/siti/usr/foto/files/45947263772.pdf
    • https://pmrmhss.com/userfiles/file/96914759739.pdf
    • http://itaxabc.com/userfiles/file/20210917174603_1578192973.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/d0f2ae0376049c03437eb9318894ceed/biniwitekekuseberusabavo.pdf
    • http://elitacasa.it/images/file/virug.pdf
    • https://sarenpinler.com/calisma2/files/uploads/28510607515.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325fdbbf3af---sinogupixofome.pdf
    • https://togeltop.net/contents/files/domoxogixep.pdf
    • http://auburn-companies.com/userfiles/files/79052060885.pdf
    • https://cytairtool.com/test/userfiles/file/20210904_2d84f.pdf
    • http://119pump.net/d/files/54113660450.pdf
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/dexikalukewapilivefap.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+can+i+move+the+apps+to+sd+card
    • 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_off0000d51f.bin
7c9cfd079ffbcd73261e262cea80e26548807a29060829b19aaff9d249d07600		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD51F 17704 bytes
font_01_sfnt_off00010231.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10231 16792 bytes
font_02_sfnt_off00011a48.bin
396b0ff4f863d5af9d47e0d09fbcd2219dfd16859e1daf450cbaa3fa4b7dba31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A48 10876 bytes

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