Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddff118edf039e05…

MALICIOUS

PDF

68.9 KB Created: 2021-09-26 18:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 20c9fbadc9b128b8fd500f7fbe9d4e24 SHA-1: 370a6c35836374e2cfd605807fd1f1bafd353f9c SHA-256: ddff118edf039e05ebeee8ab377023d058f461f39790fa1865769cc7446003b9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external URIs, many pointing to disposable domains and configured with UTM parameters, suggests a phishing or redirection campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://havadisname.com/upload/ckfinder/files/xalijamojil.pdf In PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/20994195466.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/toxolizegodali.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/73372025146.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/vobezugamat.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/bawirexu.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/fagozosiginoje.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/31111211376.pdfIn PDF document text
    • https://adikketiga.com/contents/files/82423410868.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132a16a20961---27388672834.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/bumotolupafevikuli.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614b639690229---9153121244.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/wajifabivamujuzemebosi.pdfIn PDF document text
    • https://kaparatt.com/images/File/lomavobilumosojamazamibo.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/jupimilirineziv.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/vunamosamapopetiropozoxuw.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/48575631279.pdfIn PDF document text
    • https://strechybenesov.cz/content/kebujogapebadunajoli.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/devijexotebavawojif.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/ruvuropudenix.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/zomaxaxufazi.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/kivez.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/32565404842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=18+again+eng+subPDF 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_off0000ad24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC536 15904 bytes
SHA-256: 45bd7485944d61638bd29d7fce4ae65800c3a5615cc204812f397cd4986fbad6
font_02_sfnt_off0000ed94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED94 10324 bytes
SHA-256: 1b5767f60db927f7dfa4ba21daf58a3f1eab5fd4aa4cc3d57c91dc0721a333db

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