Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb62336361cb9e89…

MALICIOUS

PDF

89.0 KB Created: 2021-09-13 12:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 275b32a75109ea2454539d1ce0494a54 SHA-1: 245a9691acd65ed333f118e518697c0502097477 SHA-256: bb62336361cb9e89fa7a2eec50ebffd9eebe8e58219f17a8d575e9aaebd833c1
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, some of which point to suspicious PDF files. The presence of a visual download button lure, combined with the ML classifier and ClamAV detection, strongly suggests a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://twfbs.com/ckfinder/userfiles/files/zabamowisodugas.pdf In PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/56636725184.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/2317363032.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21528925696.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109041801552737.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/wametelajek.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613edc36ea057---rezupiluzupepabitalada.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/646053384.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/bakun.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/xejajireb.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/kobesodebuwopegonaku.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613587b0418e9---91623711915.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/pesawojado.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/kofokavajenetijiv.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/nejavowopofi.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/dutilate.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/bumol.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/vagupinifiwilalalijol.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/65061437671.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/39272611440.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/80026661956.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/zukopusufubiriluvo.pdfIn PDF document text
    • http://potya.com/gamegozaridena.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/pibasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=streaming+film+shutter+islandPDF 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_off0000f3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D4 19220 bytes
SHA-256: 04309b5f3df408cd9e987b63f6004aaea97c02c2be9ae830b1dfd24860c0c223
font_01_sfnt_off000125ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AB 10856 bytes
SHA-256: e4f42aaf15356d033df3824c8c373ad86a37068344c06361b520a8778c2e4a2d
font_02_sfnt_off00013e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1