Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5211bd2c62bf7f7…

MALICIOUS

PDF

86.6 KB Created: 2021-09-17 00:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f3997a48add4147d8c299e1852ec9c78 SHA-1: 316e7ba28d8384a1b67725a10c133444fb89b011 SHA-256: a5211bd2c62bf7f766e7d495a2a543544858c273f4db310d80341829a24368da
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://www.aaptuk.org/ckfinder/userfiles/files/puburenugiduru.pdf In PDF document text
    • https://gujaratisamajparis.org/upload/files/18038187048.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/66229819700.pdfIn PDF document text
    • http://parfumland.sk/upl/42868079282.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/21582650231.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/37656766206.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/56263687971.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/pivivifuriwunanejum.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/13413891555.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/76988791806.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24661717440.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/fupagowumenoledosixedefax.pdfIn PDF document text
    • https://funbugs.ie/files/file/8217188549.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/betapitenolafuz.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/1971937648613fd2e603008.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/1fce82c589bd0d70cf22b89a51858cbf/58134549746.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/rogesudidaxijedidofaj.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/xiwivifafu.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/zimexotarojoridur.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c37038d951---xuzev.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/6293066410.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/88258692698.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/50042788918.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/nirokivubewoja.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/91143076952.pdfIn PDF document text
    • http://benetalent.com/upload/files/vimimalojo.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/75043637220.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+watch+sports+on+firestick+for+freePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3C 18868 bytes
SHA-256: f3b80ff02f68ad3dbe9f088f959421eb5e4492bc6d2afdf0d21b0e34d880bf74
font_01_sfnt_off00011bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C7 10700 bytes
SHA-256: 066aeaeadc89a68fdd1a051e78dbf1e607981281de0015bd22842f46f96ece3c