Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91969602a2df73f…

MALICIOUS

PDF

69.3 KB Created: 2021-09-28 19:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a78786539f9d69eba719bd7edfc9d1d SHA-1: 19da6f15e34a76bfe728dd25715e7ba637421a92 SHA-256: b91969602a2df73f5d39336358ffc05102294340ce203ef54d8eb467d5a26c5f
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URLs, strongly indicating a malicious intent to redirect users or download further malware. The ClamAV detection and ML classifier further support its malicious nature. The presence of embedded JavaScript suggests an attempt to execute code, likely for payload delivery or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=change+your+thoughts+change+your+life+pdf
    • https://interativacorretora.com/fotosempresa/files/daxebopexuju.pdf
    • https://vas-vill.hu/userfiles/file/15557610138.pdf
    • https://empezo.xyz/js/ckfinder/userfiles/files/80519139690.pdf
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31507032824.pdf
    • https://cleaner.pl/userfiles/file/35664855279.pdf
    • http://vinmexindia.com/uploads/dupamikegi.pdf
    • http://sieuthimaynhapkhau.com/upload/files/lelijuxuwutovadipeko.pdf
    • http://physocare.com/Images_upload/files/rikibowalugav.pdf
    • http://stigstudiotecnico.it/userfiles/files/6262466010.pdf
    • http://tourgrodno.by/images/content/file/ruzolawemumepelote.pdf
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/94833118638.pdf
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/75970304833.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161415efa28b34---61115124385.pdf
    • http://inspeq.eu/public/files/46098611139.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/55260c1600815f3315ec2802844e59cb/xibawodixu.pdf
    • https://trystsalonri.com/images/file/jozezorudiv.pdf
    • http://ucg-eg.com/userfiles/file/92177256275.pdf
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/64296681609.pdf
    • https://lux-ride.com/home/u4-6pzgszajsb5u/www/lux-ride.com/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/tenesetarumupinewimevip.pdf
    • https://gres-k.cat/userfiles/file/dutowuvebigube.pdf
    • http://acutecardio.ru/sadm_files/kuwave.pdf
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/57646652025.pdf
    • http://wittlich-luexem.de/userfiles/file/15372068415.pdf
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/zivagasepamikobika.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_off0000b106.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB106 16792 bytes
font_01_sfnt_off0000c918.bin
700da4223589994fb84a16eff40f9ed4f82611995cb3e706ca6ac35f59bdfd26		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC918 14752 bytes
font_02_sfnt_off0000edd6.bin
f547c24c3c0c9761aa5862907b8cda82747ad04bb9ed458bf4aa4bf8bff23326		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD6 11144 bytes

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