Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e30eedf1c413e0e…

MALICIOUS

PDF

81.0 KB Created: 2021-09-11 20:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9a7f41cee27f80a3fabef100c8fb0c57 SHA-1: 5eb76c6823272beaf2b4bdbc65846c4acba2ade9 SHA-256: 8e30eedf1c413e0e19009e53c00716743e8d6c92ba2f7e16e02672abedddf577
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to potentially disposable domains, suggesting a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://easresidence.ro/app/webroot/files/userfiles/files/99215862820.pdf In PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/95483454966.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/5574445823.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/34447807779.pdfIn PDF document text
    • http://biomehl.com/images/content/files/3705487195.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/nales.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/fudaxujolirima.pdfIn PDF document text
    • https://dabanbep.tanglehadong.com/upload/files/63104777525.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/1556192583.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/161327db3f1bf7---82140695257.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/50324172635.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/goguludexotekejesoxuniwan.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/4841435315.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021911_25634_101.pdfIn PDF document text
    • https://music-group-store.com/upload/files/buborarelugowusaw.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/94757589471.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/47293626627.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9b4613038---89866143079.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/20398893683.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-6/20210906034915262108.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/wosivifowixedawa.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/lasazuririzebuwaled.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/jitimukidowiwejidodizulu.pdfIn PDF document text
    • https://miet.hu/kepek/rolunujilewotedukimo.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/sigojifekizales.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=star+trek+timeline+mod+apkPDF 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_off0000d692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD692 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA9 10552 bytes
SHA-256: 1e144b1eb36b1cd46b3834a68786b6c466af0b59a6cdf7cc6b3a51abcc53c083
font_02_sfnt_off0001069e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069E 18760 bytes
SHA-256: ec7381ea351a6338796758de2774589aaff2ff9a3359bf40e533239f1636efb1