Malicious PDF — malware analysis report

Static analysis result for SHA-256 28cb272d57379cab…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 15:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 895c3da75723063fc38e1f45147feeef SHA-1: 84c503bd135e55781569a1bbf3cdb0dc86c13814 SHA-256: 28cb272d57379cab107aca9ebc8ffd093189f55b851a346a17bb46eec6eaeabf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which are on disposable hosting and appear to be part of a link farm designed to redirect users. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://huntic.ru/uplcv?utm_term=robux+apk+hack
    • http://wyadonline.com/userfiles/file/95572131551.pdf
    • http://sooclose.eu/upload/File/guzesise.pdf
    • http://orthopediedelft.eu/files/jepelaruxeropugakopamu.pdf
    • https://datatech-int.com/userfiles/file/14864030861.pdf
    • http://ersatzmonitor.de/userfiles/file/92685433472.pdf
    • https://doina.md/fckeditorfiles/file/71479282693.pdf
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/roladuzejufileguj.pdf
    • http://tythb.com/uploadfile/files/39954261869.pdf
    • https://people11people.com/uploads/File/5195393173.pdf
    • https://atlantidegattico.it/file/28436452417.pdf
    • http://gidromall.ru/img/uploads/file/23001924887.pdf
    • http://woodwork.pl/ubezpiecz/obrazy/file/fadowetoxewoxa.pdf
    • http://myapartment.de/web/editor/files/vemusubikure.pdf
    • http://lachambredechos.com/userfiles/file/97255843445.pdf
    • http://irvine.songhakbbq.com/uploads/files/20097736220.pdf
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/doguxivalesi.pdf
    • http://usmleworkout.com/files/file/75795258662.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/hs44uievb0ldla33v6mjp41ua2/28124655960.pdf
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/vedimopopuwepiduzenepa.pdf
    • http://whkmradio.com/userfiles/file/tutibujoxuwegiwejesa.pdf
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/voretedijiwixudisuviside.pdf
    • https://et-auditing.com/userfiles/files/kotivikugebuk.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_off0000d462.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD462 16792 bytes
font_01_sfnt_off0000ec74.bin
038a626cc40612d726c065b2fc6d6869902eabc052009df4e98590c3b764898f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC74 17436 bytes
font_02_sfnt_off000119c9.bin
93409b258a10347c23296bad3789d7418cb2e843eb3494c8aa8e7040b6393675		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119C9 10212 bytes

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