Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4129dcb66c148c…

MALICIOUS

PDF

75.2 KB Created: 2021-10-05 12:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47d525c709aa496657cb2de259a0d900 SHA-1: eb73fca9fbf731241982a39a4c1925c729a7f35e SHA-256: 9e4129dcb66c148cb2141ee4e5f8e01dc017ab7a8f4a2e978588106eb2fd6221
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to PDF files on various domains, suggesting a link farm or redirection mechanism. One heuristic specifically identified it as a 'link farm on disposable hosting' with a 'utm_term_redirector' parameter, reinforcing the phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://gusanhightec.com/userData/board/file/tewajavitaxelituleduxajam.pdf
    • https://mots.alaxarxa.cat/cmsimple/images/file/mixegafuligokowen.pdf
    • http://laxycoffee.com/upload/files/95446115591.pdf
    • http://digilit.ir/basefile/digilitir/files/49269984512.pdf
    • http://apart1day.ru/file/41204497673.pdf
    • http://ylphs.com/ckfinder/userfiles/files/kuxagupajowupaxag.pdf
    • http://yigang-lin.com/uploads/files/202110050947456089.pdf
    • http://sunil.kr/uploadfile/fckeditor/file/85773380405.pdf
    • http://metalzilemboeventi.com/userfiles/files/52339534995.pdf
    • http://merklink.nl/site/data/ws/files/74538325278.pdf
    • https://invision.buzyhub.com/files/59498878185.pdf
    • http://studioarchterreni.it/userfiles/files/gijifixuwo.pdf
    • https://www.htlexpress.com/ckfinder/userfiles/files/juberasuvixogesizagizuped.pdf
    • http://dinobajka.pl/Upload/file/getefajipox.pdf
    • http://laserinnsbruck.com/static/26806090206.pdf
    • http://websurin.net/UserFiles/File/99825724354.pdf
    • http://dentherapia.hu/files/file/tolefimeroxore.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d46e510758---sikalaluvifinanoduso.pdf
    • http://gusanhightec.com/userData/board/file/10707583615.pdf
    • https://ww150003.linebot.net/upfile/files/20210907032634.pdf
    • https://namkhoasaigon.vn/web/images/files/59421865554.pdf
    • https://luyenthitoeic.info/userfiles/file/wamidoxuzalaw.pdf
    • https://ontogepszerviz.hu/editor_up/20320634104.pdf
    • https://path.mn/userfiles/files/didise.pdf
    • http://euromarkcreations.com/new/fck_img/file/nijosumarivijalu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=minesweeper+unblocked+games
    • 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_off0000c14b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC14B 16792 bytes
font_01_sfnt_off0000d95d.bin
fa009b1133c55ab58aa2c724aa520633576ddb65ef8c4fe60131b404c23ca5ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD95D 17144 bytes
font_02_sfnt_off000105ca.bin
a4b7f2c78ef8b1b9dda224473c98c78ab8bed1a87e009c6b5193e0c8dccb9590		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105CA 11172 bytes

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