Malicious PDF — malware analysis report

Static analysis result for SHA-256 265e7f1145c18a20…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 21:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d2f45e380babe0212df3346db952d88 SHA-1: e89b6c8ffa44128d7ad8685702a262578f27ce5d SHA-256: 265e7f1145c18a20ce4c94cba6e11ba1b8f14975ca5a1dbf27d9d77bb86b5d70
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. This pattern is commonly used to obscure the final malicious destination and evade detection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://yokohama-model.com/userfiles/files/20497061356.pdf
    • http://outspokenholland.com/userfiles/fckFile/20210917223615.pdf
    • https://basisnomor.com/contents/files/79702193834.pdf
    • https://drlalashow.com/php/billboard/uploads/file/63737386167.pdf
    • https://media-get.ru/userfiles/files/84770249218.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161495633ec8ef---75487695106.pdf
    • http://sskj.pl/userfiles/file/dumudufapeb.pdf
    • https://consultingexpert.eu/fckeditor/userfiles/file/57646511276.pdf
    • http://wxbeimei.cn/upload/ckimg/files/202109061649057730.pdf
    • http://st-johnson.com/Uploadfiles/files/reves.pdf
    • https://ww150001.linebot.net/upfile/files/20210905152233.pdf
    • http://cukrarska-vyroba.cz/UserFiles/File/fepek.pdf
    • http://erictex.com/ufiles/files/12338912738.pdf
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/jiniruvigime.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161363e799a1e8---80041998056.pdf
    • http://medeeatour.ro/mm/file/varibijigot.pdf
    • http://gelinyuanyi.com/upload_fck/file/2021-9-8/20210908025722891175.pdf
    • https://www.hmgfinance.com/ckfinder/userfiles/files/74933696040.pdf
    • http://ashole.hu/UserFiles/File/pelab.pdf
    • https://sluganarodu.org/userfiles/files/mawaxes.pdf
    • http://tmtechvn.com/webroot/img/files/puxekapo.pdf
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/xizodefejat.pdf
    • http://www.peritaonline.es/ckfinder/userfiles/files/22842047618.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=a+crash+of+rhinos
    • 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_off0000b236.bin
1ddccd434e363462dd6fadeba34b55e5a6abaced8545ffad5e0c052edb7e4ac7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB236 17172 bytes
font_01_sfnt_off0000ddd9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD9 16792 bytes
font_02_sfnt_off0000f5f0.bin
c6279a3bf3909f7bdaae7094b88f866239fc511981b0844f9205a837a62d8bc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F0 10140 bytes

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