Malicious PDF — malware analysis report

Static analysis result for SHA-256 919c2f735fca1897…

MALICIOUS

PDF

82.8 KB Created: 2021-09-21 23:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 01843a03690c6fdf5163e737b79148e2 SHA-1: 147a8a039358f49bbab156da121a2851d949c169 SHA-256: 919c2f735fca18972a3418ef76d7aeef0984c13d65ea627e665a9523e46617f6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading unwanted software or visiting malicious sites. The embedded JavaScript is likely used to facilitate the redirection or download process.

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://synerhu.ru/uplcv?utm_term=download+apk+redtube PDF link annotation
    • https://dm288.com/slicice/file/6694309648.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/kukolokegufim.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/denewadivesetexatodek.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/96317613051.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/pabivanosaxavejogik.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/xubedatinuluzoxip.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/59105423984.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/gipedipuwarevu.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/zefidopesokegib.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/12760165387.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/70447888853.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/fodavile.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/47842224367.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/47472010387.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/zetowetov.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161416f84552b9---wufatiwirogazekitiranos.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/befiwu.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/wanamejuwaze.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/34580150409.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161303d8d40d2e---sosupudosoliwumixulusebof.pdfIn PDF document text
    • http://stonebreaker.at/mozezomuvelabube.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/gewamo.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/lenimatokiwegirasamoji.pdfIn PDF document text
    • 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_off0000df41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF41 17980 bytes
SHA-256: d6499ea8c8292d349d31f9c7687f4d5b0f5060e02f78886164ce9a2de3a108de
font_01_sfnt_off00010dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD3 10544 bytes
SHA-256: 69271d9bb0a1956b7e2dc9936715f91048b2ff236677d294776fee1fc1120e56
font_02_sfnt_off000125cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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