Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9c5f2598039f61…

MALICIOUS

PDF

80.0 KB Created: 2021-09-24 00:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 76b9bb3b5775bba4cafcb08325006bd7 SHA-1: 476112f8a2a37f438f9199b9f3cffe55da79560a SHA-256: bc9c5f2598039f6137e51408b9717707bd5ff33fc16f6d77960309c6adcc4ead
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://magyar-logyogyasz.hu/fileok/file/49893117534.pdf In PDF document text
    • https://theurbanthinktank.com/files/losumuxu.pdfIn PDF document text
    • https://checkmavandon.com/asset/site/files/93329679968.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/pezivigezazunemojewa.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/piradabikovuxikagewi.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/jutexinurut.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/ditumozojabitenagurobosug.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449dd8d71cf---digizifomawomudiw.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/26699275270.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210914114315.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/wadotikagobatesivezefi.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/17832574932.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/30550374612.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/budegosul.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/musejomaba.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/53982944087.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613013b14f887---12055783674.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/sinabipizosobaxex.pdfIn PDF document text
    • http://marketingnews.fr/images/file/53500459541.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/mevaxawepeja.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/dewaki.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/bujisamojidebisum.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/tanizuwefa.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/61362115507.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/68161763580.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=pokemon+heart+gold+rom+ita+drasticPDF 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_off0000d061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD061 10912 bytes
SHA-256: 515f1eafce41b2194a5088d145bce73051a715777303f4192ce3573318266793
font_01_sfnt_off0000e935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE935 19004 bytes
SHA-256: a4dbc24e97e840c22ae336c7d4fda5da0439119a1dbb8f5812708b3a6707be43
font_02_sfnt_off00011a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1