Malicious PDF — malware analysis report

Static analysis result for SHA-256 e710397782d36ab1…

MALICIOUS

PDF

67.9 KB Created: 2021-09-25 09:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4729cb800b2af8bb738220d0fbebd8d SHA-1: 5106a7f350def2eb1668d6581d70784629d182fe SHA-256: e710397782d36ab1d9073f60948b58f01f55cf8d1daf83ab645339aefba76d3f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=dreadball+2nd+edition+rules+pdf
    • http://beijingxinzhi.com/userfiles/file/20210908201645_2088669676.pdf
    • http://ck-kutnahora.cz/gais/image/file/2629725662.pdf
    • http://mtsskzy.com/userfiles/file/tokapakagiwuj.pdf
    • http://www.jindatunnel.com/up_files/file/tixavanujabipapinu.pdf
    • http://www.jindatunnel.com/up_files/file/97339992930.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c9d7be7670---78464726298.pdf
    • http://saikunghouse.hk/userfiles/zapixunuxudupogikelo.pdf
    • https://chingchia.com/uploads/files/202109012213442834.pdf
    • http://ducthoaudio.com/upload/files/nibufo.pdf
    • http://marcus-1.com/FileData/ckfinder/files/20210915_2B5A0F1364F563BA.pdf
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/jomegawutukipa.pdf
    • http://bftt.marketsearching.com/upload/files/kedotififowetowobamutolu.pdf
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/nadirogelaxudeninigu.pdf
    • http://srcchaika.ru/files/uploads/files/6850613996.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/rutiwinoditumakogasoka.pdf
    • http://kursadowicz.pl/Upload/file/vuzawosaduzuvemijowen.pdf
    • http://biemmecommerciale.eu/userfiles/files/81826888874.pdf
    • https://hobbes-group.com/upload/files/numilixopepe.pdf
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/zuluribexugosobelinada.pdf
    • http://startent.ru/SITE/files/editor/file/73717312869.pdf
    • https://axlthailand.com/imagexx/files/saluxunibozet.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_off0000aba4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABA4 16792 bytes
font_01_sfnt_off0000c3b6.bin
72d9f8bb2ee0b392135eeced4fb697d06b6ec4ccaed1b26c4a07a5e0a4833133		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B6 14804 bytes
font_02_sfnt_off0000e902.bin
57edeff5464cd80a13579de5c31d9553238acbb03f5ef3ae6c7230c3cc498bf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE902 10852 bytes

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