Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b226a80554b6b51…

MALICIOUS

PDF

73.6 KB Created: 2021-10-03 22:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93dc7d66c341ffe65e915f8ded2a3eb1 SHA-1: d9330af72322e604d5ec442d10fbd7967eb94e08 SHA-256: 9b226a80554b6b516486039333ca55a8e7bca7410e1c1d38c7e815224e4e9019
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or malware distribution. The presence of these URLs suggests the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=here+boy+are+you+crazy
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/fitevu.pdf
    • http://chiari-web.com/ckfinder/optimist/files/11746709083.pdf
    • https://www.leasing.net.in/ckfinder/userfiles/files/jumurediruvenuxelob.pdf
    • https://kpii3yaw3-7nc.com/contents/files/pakuxedirelafe.pdf
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/rosabezemekozixovaka.pdf
    • https://livermore.com/wysiwygfiles/file/niporerakurofovawarol.pdf
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66169751496.pdf
    • https://035620126.tw/upload/greenkitchen/files/5592749872.pdf
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/53992639541.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614cb84caaea3---ralilorekolodoze.pdf
    • http://nhatrangpalace.net/app/webroot/upload/files/86391167409.pdf
    • https://assignmentmart.com/ckfinder/userfiles/files/10932736173.pdf
    • https://nexusmediation.nl/files/79533344723.pdf
    • http://studioarclab.eu/userfiles/files/13290157264.pdf
    • http://bassbasement.org/userfiles/file/54575307530.pdf
    • https://zemtechnika.lt/public/site/0files/xikuzotepulemivunor.pdf
    • http://metapolar.hu/tmp/musuzeno.pdf
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/62799292202.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356421d48e0---pinuvowi.pdf
    • http://kondicionery-elektrostal.ru/upload_picture/file/90095599554.pdf
    • http://life-homeshop.com/asset/uploads/files/dawevazilinepetepok.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad02.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD02 16792 bytes
font_01_sfnt_off0000c513.bin
01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC513 16232 bytes
font_02_sfnt_off0000daed.bin
9b7b94f775013d28da706c49821cd835f5f8ad60e298e9761c591d92f080ab77		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAED 10120 bytes
font_03_sfnt_off0000f1a5.bin
9019ae7d619a594a8bcbfa593a955efcac1c77dd1873f5df5c55f8d06a2eef8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A5 15504 bytes

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