Malicious PDF — malware analysis report

Static analysis result for SHA-256 90419de3c149a687…

MALICIOUS

PDF

71.0 KB Created: 2021-10-07 02:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ae311ec168fa4163cb2715d67f3458ae SHA-1: c1629a57b78556c1e398b9ca7d88b0f644b6038c SHA-256: 90419de3c149a6875c666ac0c08df7612d7e0148e8cc5068df510c912b0e0cde
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to external URLs, as indicated by the numerous extracted URLs, many of which appear to be part of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://chcial.ru/uplcv?utm_term=convert+pdf+into+word+editable+format PDF link annotation
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16148748ae5675---fajixuzaxusevo.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/f2d54830d313f5334795339dd05dd9dc/xalakujafunorasokewila.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/finuzazukemi.pdfIn PDF document text
    • http://htygroup.com/upload/files/mugovaniwomikosurile.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/wuvofakufifej.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/patewuvojiz.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/35053322558.pdfIn PDF document text
    • http://philipsphotographystudio.com/24638260817.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/11673779440.pdfIn PDF document text
    • https://aneri12.eu/res/file/nanosasikezudonexagu.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/zekari.pdfIn PDF document text
    • http://nantong.chinatupai.com/web/js/ckfinder/userfiles/files/rulagosopi.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/191598540.pdfIn PDF document text
    • https://bak.vn/upload/files/37696297097.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/setexipi.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/kuwosegixijusurata.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/58357836341.pdfIn PDF document text
    • https://panoramabyty.cz/content/tekomimu.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/20521828791.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/67415454047.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/xepodijafipovidewelopurur.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_off0000b615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB615 15448 bytes
SHA-256: 69686a7adb1db95482b15d040813acf1b55c56c495e646495e5892736149b512
font_01_sfnt_off0000dd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF588 10816 bytes
SHA-256: 33e514165b680393199d476c4253ba4a71e95fe8f96fc4eea431296d04c2f65b

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