Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b463d0369fba08e…

MALICIOUS

PDF

81.0 KB Created: 2021-09-24 06:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 164c5d11c428bb65817be61c18492f51 SHA-1: 70a12b42cab9c99ba3c0e769b5f8876e36ae02f1 SHA-256: 8b463d0369fba08ec36b06983f05916e326ef706cccf8816e58d25156e6a36ae
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute code within the user's browser or PDF reader. The numerous external URIs, many hosted on disposable domains, point towards a phishing or link-farming scheme, likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=operating+system+examples
    • https://nikunjfoundation.org/ckfinder/userfiles/files/56324238367.pdf
    • http://studiotecnicoforace.eu/userfiles/files/jixidekazexedabus.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/4fbd1d3c1d70b7d2c6c3120160cf4746/75424134844.pdf
    • https://reniuved.it/file/luzagidofoxiliwasulitukik.pdf
    • https://gkia.org/kingkong/userfiles/files/48686711938.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16148a62c2fa22---18237822895.pdf
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/18998438342.pdf
    • http://elverum-revmatiker.no/images/file/waxataku.pdf
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/84403224721.pdf
    • http://jiehuist.com/userfiles/files/dunegimokusaro.pdf
    • http://hycxchina.com/filespath/files/20210910060555.pdf
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/72831053904.pdf
    • http://xn--h1acbpobggs.xn--p1ai/data/files/89554666517.pdf
    • https://infypos.com/infyposcms/media/8376592418.pdf
    • https://defi128.phpascal.com/userfiles/files/kikajurukudulomaxojadorad.pdf
    • http://abwwilson.com/uploads/files/gogadetivapiwuxe.pdf
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/powosipuxejaloven.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/44516900693.pdf
    • http://www.jacenter.org/js/ckfinder/userfiles/files/pojotono.pdf
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/jumajukesabefasafa.pdf
    • http://ropesadventure.com/d/files/mefojifelojerokota.pdf
    • http://rent2day.ca/ci2/userfiles/files/94579753553.pdf
    • https://hkki.org/userfiles/files/foxatejaligerakoneje.pdf
    • https://www.jdconstinc.com/ckfinder/userfiles/files/26755025890.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_off0000d7eb.bin
8246bb58e141df0f634596568b1eda04b3a29854d98b1d85e138cf22d5bc2cc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EB 17572 bytes
font_01_sfnt_off00010559.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10559 16792 bytes
font_02_sfnt_off00011d70.bin
2e87ffcccfb2873d4d936e3a54af1bb079ec0391cc7a94016d8999821bf855d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D70 10716 bytes

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