Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf7c8a39dda1ef5…

MALICIOUS

PDF

75.1 KB Created: 2021-09-16 14:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: bc215f01ae82d99877fbef26694969de SHA-1: 5543db687cc7c19806a53d9892e29504d3a124e2 SHA-256: 7bf7c8a39dda1ef53fd9ae3972ec09198b06652f119b6127170ba09b91f44cef
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects to one of the numerous suspicious URLs found, aiming to trick the user into downloading further malware or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://lasermedia.cn/userfiles/file/vuwefolixemewubes.pdf In PDF document text
    • http://technocom.pl/editor/file/62702921646.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/fuzumenunuguvafetojipi.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/93491391601.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bace99f2fc---75200820286.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/86705179424.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/rosalupis.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/sokasupevojude.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/judulowipifuxapuv.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/gemawojozexolixoxovef.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/woditofexadijo.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/13414891902.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/2028025758.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138305182306---vakugo.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/81470298459.pdfIn PDF document text
    • https://kawanmto.net/contents/files/90741378206.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/numumuriwij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=apk+seven+deadly+sins+grand+crossPDF 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_off0000bb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD389 19308 bytes
SHA-256: 4b5732449dcc4618544f2ca4d75dfcf400bb3973f6383d39f12775cb204e885c
font_02_sfnt_off00010613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10613 10844 bytes
SHA-256: 864807df3553d6692d16943e4ca639b334755c29723aa8bf4fb297c9a0aeee9f

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