Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b41408516497f3…

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 06:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10e13cc67914f49c3ec373c5d6477fa6 SHA-1: cb835516645003ffe8c5a615091c6c42ef016bae SHA-256: 50b41408516497f39b9bef30cdae1adcb24c4839d470e93d905c7d36a272c741
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, strongly suggests a phishing or malware distribution campaign. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and heuristic firings indicate a malicious intent to redirect users to external 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://wastran.ru/uplcv?utm_term=ppsspp+football+2019
    • http://sictombbi.fr/ckfinder/userfiles/files/xikorej.pdf
    • http://unite-chem.cn/upload/files/56747445770.pdf
    • https://aymexco.ro/ckfinder/userfiles/files/fuxevepegafuw.pdf
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/9322128845.pdf
    • http://www.premiumimport.nl/ckfinder/userfiles/files/gudedarabix.pdf
    • http://kenhuffbuilders.com/userfiles/file/91310455519.pdf
    • https://nexapos.com/upload/files/kemexupizazawoluroj.pdf
    • http://kingtonkatsu.com/uploads/files/87006989067.pdf
    • http://metabolit-plus.ru/files/file/jifilomovijome.pdf
    • https://globalcareerclub.com/FCKeditor/userfiles/file/buvolovowidalobumat.pdf
    • http://ascensionchina.com/userfiles/file/luzeridupadalobira.pdf
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/210123337423.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410df209ab2---sisumuxexipigeditaxe.pdf
    • http://gnox.vn/upload/files/27653792479.pdf
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/xapum.pdf
    • http://tythb.com/uploadfile/files/fawiwobajuvisa.pdf
    • https://x-software.cz/data/file/ropixexojoxanamojog.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/pesifij.pdf
    • http://tunglamgarden.com/images/fck/file/8309019911.pdf
    • http://nikolalepojevic5.com/multimedia/file/musisopejosuxalolajosezab.pdf
    • http://test-immo.com/file/fuwomepirigabuvibapaxuwoj.pdf
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wapikidixuzulefo.pdf
    • https://krossi.ru/images/content/files/49076655865.pdf
    • http://komodovo.ru/upload_picture/55850205948.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3a4.bin
5558ee9e9b1d7d1da831ba2aed3844261ef49121be27fd10a65c0e700fc81882		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A4 10524 bytes
font_01_sfnt_off0000cba1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA1 16792 bytes
font_02_sfnt_off0000e3b3.bin
d56d4cbc195b5a792adde06990062146b2a8c837f5c22db534940caea5600ca8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B3 16524 bytes

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