Malicious PDF — malware analysis report

Static analysis result for SHA-256 8688f44d01d83c6d…

MALICIOUS

PDF

85.4 KB Created: 2021-09-19 03:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 37e4a37b642987d3bf4eeb566778a209 SHA-1: 74826a82bb337cc05dbb610257d61486e49307af SHA-256: 8688f44d01d83c6d9bd56d141bd1326a9219a2e317b3cad2dccb14959b5e0c45
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

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 http://canadianrockies.info/files/file/zugoxigefegixonu.pdf In PDF document text
    • http://ventilatoryzlin.cz/images/file/77002508931.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/jakuki.pdfIn PDF document text
    • https://lecachet.fr/docs/files/dodelodopakavebivix.pdfIn PDF document text
    • http://firegallery.ru/img/upload/vunobakezaw.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7841ed67b---vefas.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/1778fe87266d13284cb323d9d0b12b76/vilapisinosagaj.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/64282871525.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/negapamoregijagelivomevab.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/retaf.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/pubafozurefelo.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210918114515.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/29564093588.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/genusenumonomagid.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/54642070668.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/547442792.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/30286576728.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/sagawulisujodera.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/41050491521.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/95776281364.pdfIn PDF document text
    • http://www.polni.si/Images/files/23562830567.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/11665328084.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/zafeganepamumuzake.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/86747735277.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/39924497637.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=best+table+tennis+game+for+androidPDF 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_off0000e9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EB 17424 bytes
SHA-256: 257abc24f40d551cb856812f8e817a72d53a910134244bd4149549e5a860e0a2
font_01_sfnt_off00011684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11684 10888 bytes
SHA-256: 2ab70869ba2519cd0504d3d6080edaed5954e34462bb039980c0ae9468b2bdbf
font_02_sfnt_off00012f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1