Malicious PDF — malware analysis report

Static analysis result for SHA-256 00fbf2676e758e61…

MALICIOUS

PDF

69.7 KB Created: 2021-10-01 07:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6f6eae98b9d0e1fe24cb1a1d8119b450 SHA-1: 7f4138da7e5209f691a43653d4540046b0d55a21 SHA-256: 00fbf2676e758e61bdec5955c668fe9090def2f56d2919e87c2c2b57d7ecff64
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs to execute code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to redirect to multiple external sites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wahluenfty.com/userfiles/sonaruv.pdf In PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/talotapogafigusone.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/tiwatewo.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/36447655367.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/xitituxokorivagefu.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/vizepikaxog.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/mamawewek.pdfIn PDF document text
    • http://xn--80aer5aza.xn--7-4tbj3b.xn--p1ai/ckfinder/userfiles/files/vafonoluwo.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/sufenuzutinunogezururemi.pdfIn PDF document text
    • http://xn----7sbabjlebzbdsbxti2bw3r.xn--p1ai/files/files/sabozim.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/34164675582.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210908102436.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/xebefejurumotemegizux.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/45458473972.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/93947320077.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/56535947441.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/94517867110.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/wenasezobojunitasisezaga.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/zenigusu.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/31697867404.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/20563719346.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/13017971758.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/27328126729.pdfIn PDF document text
    • https://rtaadmin.mrv-educationservices.com/content_file/files/99182324839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=headache+emoji+androidPDF 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_off0000b033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84A 10444 bytes
SHA-256: 3d546314c79984376ab2bcfde81718d829f65c4e8e330db9e08ef1a9a2e6ae32
font_02_sfnt_off0000df96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF96 16520 bytes
SHA-256: 8144a8b408a08aed0c283c89716054f22d0b277f0c536d1e09d2d67b4fe2b535

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