Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1cc36f7849205bd…

MALICIOUS

PDF

73.5 KB Created: 2021-10-10 02:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 859ebf08c40ec0f72e8e5b2cb0d56abd SHA-1: 2376d8087ded4418692ab3b1c8f02b6b7d3c15a8 SHA-256: a1cc36f7849205bd700642b7d6522cfd7de2f1f0f4060f6b7f28fd10df8a1543
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a high number of external URIs, many of which are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://hotel-gerard-dalsace.com/upload/document/24602143081.pdf In PDF document text
    • http://protezas.lt/i/File/duwabibinum.pdfIn PDF document text
    • http://lilipoupoli-drama.gr/lilipoupoli/js/ckfinder/userfiles/files/12851293743.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/dibamexiwujirojezadolivo.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109111608094576.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/16397218973.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20211002175221.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/59952660949.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/buxasubik.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/47048762597.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/vejonove.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/vesezigelevadi.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/motobetubudeledeviwa.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/bimutuzediwakilofuseliv.pdfIn PDF document text
    • https://ssea2.deegbesprofessionalcare.nl/files/File/gezepulitoxu.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/furizuximigimifaju.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/wotalal.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/211005094750472926ojrgy.pdfIn PDF document text
    • http://blccy.com/userfiles/files/dudebelam.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/45055157225.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/91233286213.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/nujewowivegurevumififukob.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/dadijupu.pdfIn PDF document text
    • https://medtek.vn/storage/file/40976702122.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ed6d8f1dba---momawosa.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/19750148084.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/tupusixaxobova.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+hack+robux+2020PDF 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_off0000bd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56B 10540 bytes
SHA-256: 1df6b5722b825f085a1e487df80f3fce9fa231d36744b8da4d0525a7c5b2d597
font_02_sfnt_off0000edae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAE 16468 bytes
SHA-256: 9802d7eca1b1cda2f35f82acd82422188c857e437943d9e61704aa1607e4265c