Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b47d6c6064d8dd7…

MALICIOUS

PDF

85.2 KB Created: 2021-09-09 08:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1e71c4c6b0c3f188695c58954cd14094 SHA-1: 7aac26b6415db668efa7c4fc9dd10b7e46dacf4f SHA-256: 6b47d6c6064d8dd7e446598fa3edc9155a449e660ffeba942e1f6cc7879f08c2
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 point to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://highdeal.linkeo.net/ckfinder/userfiles/files/pedigojemewomuxegumunox.pdf In PDF document text
    • https://arbormaster.net/uploads/files/zuteviwo.pdfIn PDF document text
    • https://proxus.nl/file/rijugipogarebulesedemo.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/30188640607.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/mesilakejuxibubepasanenow.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/tawenadobivemasewejuvus.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/83518304199.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/xozudebi.pdfIn PDF document text
    • http://philboyd.com/39389288932.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/vatojafusa.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/10547983464.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/21962115730.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/67202452751.pdfIn PDF document text
    • http://ipublicity.cz/data/file/jifozewarobowunobokizok.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/gosewovotesig.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/lafugesujisaxife.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/99329558661.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/notum.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613611efa83da---96621469851.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/bofowopezozupiropaje.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/jinazedirigaxa.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/86106298462.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/090628462417.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/61520345621.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/85198990227.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/labuzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+hide+app+in+tabletPDF 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_off0000e6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D1 18460 bytes
SHA-256: 8959532522fdba203ede42111a8811d946e93e5c4315806e6a692d7b93e14f12
font_01_sfnt_off00011753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6A 10436 bytes
SHA-256: 250f79ed2a7017c83686807f818741ab408615713029a8f35c735b07e0962bf4