Malicious PDF — malware analysis report

Static analysis result for SHA-256 790d59558b9ec6b4…

MALICIOUS

PDF

82.8 KB Created: 2021-09-10 04:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9fc908af5732c56f24469329689355ae SHA-1: 34c38b83b2907c3f758e60a2bbcc9f60dce6e303 SHA-256: 790d59558b9ec6b4f4255719911850e0bf4b0ebdc0e1799d741511f6933c628d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://almuhja.net/ckfinder/userfiles/files/39401029223.pdf In PDF document text
    • https://xcheck.vn/uploads/userfiles/file/wizeti.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/berevutuluribubiworan.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/dugafodaxep.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/28865188462.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/bofegibexexi.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/21780455860.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/76057882261.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/sawutefovip.pdfIn PDF document text
    • http://novichiha.ru/pic/file/98022411790.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/17234653733.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/68904720758.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/7420381890.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161352bab215c1---nupemefurolujakogawez.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/siguwegejajoxir.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/boxuxovuji.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/83154428512.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/jamexotuxafudewomif.pdfIn PDF document text
    • https://parfumzone.ro/files/file/8786738986.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/22149596519.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/1726696821.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/kuzijoralako.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/21798010666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=rainbow+wallpaper+for+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_off0000e32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32E 16524 bytes
SHA-256: f4a0941231bd6b00215eb01a8da45563eb41f393c001f75e24974093718813f3
font_01_sfnt_off00010d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D71 10496 bytes
SHA-256: 43516a5d2d10d402386cdc58e5831ee9c69cd12bee810159df4b1cf1b05e1343
font_02_sfnt_off00012532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12532 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.