Malicious PDF — malware analysis report

Static analysis result for SHA-256 82a61bf78fc975d7…

MALICIOUS

PDF

68.2 KB Created: 2021-09-27 04:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 115496582a5c1f6ef3b5de4d15b441d0 SHA-1: cf824cce3abff29c9783c877a728c32425a27d67 SHA-256: 82a61bf78fc975d7b1ffa7ba905e916019bac005504e655b862a32d9c2a27847
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic firings indicate this JavaScript is likely used to redirect users to external URLs, as evidenced by the numerous PDF_URI and EMBEDDED_URL findings. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/segotos.pdf
    • http://paradisoseminatrici.it/userfiles/files/28691998869.pdf
    • http://topoint.net/userfiles/fckFile/20210923213223.pdf
    • http://plusk-car.com/js/upload/files/kebaxotomevumakozelor.pdf
    • http://dotykbylinky.sk/_subory/subory/sumigigexazarejin.pdf
    • https://hogozaty.com/ckfinder/userfiles/files/99848561090.pdf
    • http://www.annaleehuber.com/content_files/file/72851654761.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/islt8tvimj7ieajeesu78cne66/tovugoxof.pdf
    • https://dpt-mh.com/uploads/news/files/38214143262.pdf
    • http://abbeytraining.net/userfiles/file/10448205247.pdf
    • http://unicaconsultoriarh.com/images/files/nowogibabi.pdf
    • https://fototipia.hu/files/files/zulaluxipomogemifa.pdf
    • https://santa.sg/images/users/00000000/files/56965743641.pdf
    • https://brawlcall.com/ckfinder/userfiles/files/30606634188.pdf
    • https://chulintemple.org/CKEdit/upload/files/ziwowoka.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/gsgnv8gpmvpjf5kjm0q0j3jori/wegumelaw.pdf
    • https://goacetours.com/ckfinder/userfiles/files/xifanelunaj.pdf
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/38631281366.pdf
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/farirabalafij.pdf
    • http://werder-ritter.de/UserFiles/File/1651465423.pdf
    • http://ecilingirler.com/resimler/files/20839150110.pdf
    • https://europawindow.com/app/webroot/img/main_content/files/doxisuvatape.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=redmi+5a+new+update
    • 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_off0000adaa.bin
086cd9f3cd301c3b7f1571c175b2dad43c0106952b3569091ceebaddf4a8fc81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADAA 15324 bytes
font_01_sfnt_off0000d3ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EA 16792 bytes
font_02_sfnt_off0000ec01.bin
c2cb6aff1024f93a549aa3312ab07d66d91a564998d4003e2687ebf8c7f521e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC01 10484 bytes

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