Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c762a47d3a48e9…

MALICIOUS

PDF

84.3 KB Created: 2021-09-19 14:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0271e24e814de65d9dcda024749f0e49 SHA-1: 92051963dc9aaceaa0615e497112c5e89c72259d SHA-256: 80c762a47d3a48e9f3f7065242eb531c0c3bbbef47eb93ef8cfdefe2a104c4df
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://eminenceconstruction.ca/viking1/uploads/files/bubutotipizadabo.pdf In PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/varuromemirejagawojuxun.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/12385075134.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/45150746476.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/kewose.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/jatunugule.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144345a14379---82520637664.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/63452762053.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/jigopopetevovuru.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbcfb0af11---nupumuruki.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/bebuzu.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/56235627748.pdfIn PDF document text
    • http://envigest.cz/upload/file/49149658719.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/10143689087.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/39321260393.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/31352523582.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/75904059617.pdfIn PDF document text
    • http://www.77ice.com/upload/files/fewutuvaj.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/84433847621.pdfIn PDF document text
    • https://2acontractor.it/images/file/fugovokirovozalikoxip.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/kipadalabegadazezof.pdfIn PDF document text
    • https://coil.hk/upload/files/nizejekakezoruxafunufav.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/71769744564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=check+screen+time+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_off0000e468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE468 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7F 10712 bytes
SHA-256: 6ada339762f16e504a350503514290decdce066d9bca130dceb6cae3cddbd071
font_02_sfnt_off000114f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F7 18172 bytes
SHA-256: 3e1a8be9ffbe8926bb6742dbf0daabd8ec7824d2ff5a8af6d74b249a20b18c7d

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