Malicious PDF — malware analysis report

Static analysis result for SHA-256 369f5b8e567a856e…

MALICIOUS

PDF

91.6 KB Created: 2021-09-16 14:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3024f8adfb0fc6ec021a4fd3202b2f57 SHA-1: 2f314260a6624f8bc40461e40c4c5ced71c178ea SHA-256: 369f5b8e567a856e090236849fdc1fb06c2810a0726e4e1874a713d05c20945a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/25785cd23cc7dac100c066c72d197105/6236166663.pdf In PDF document text
    • http://bamor.org/userfiles/file/48417951937.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/58537357582.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/tufer.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/65586262478.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/raxiw.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/13013456197.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3fd5b118e---mepewimiwegetudifonedi.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/52032573102.pdfIn PDF document text
    • http://asja.ua/userfiles/file/13903225031.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/mupekonogupej.pdfIn PDF document text
    • https://glory-aqua.com/userfiles/file/41564366193.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/85466623147.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/89801030124.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/58912684147.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/zoxurufeniralovov.pdfIn PDF document text
    • http://medica-brno.com/files/88617450289.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/M3zhqTx6OjLB.pdfIn PDF document text
    • https://kristinanamaste.eu/files/18443936237.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/guvolope.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/xezusijijerigetigisufofow.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/kodireraguzorel.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/kojadorimumapuzupuvafoz.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/tolinikigudipamika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+walking+dead+season+10+full+episodesPDF 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_off0000ff7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7B 18372 bytes
SHA-256: e2cb1bd41cbd09f64dee199ac1ffac691bae1c2c6b355be12cc288e8dea9708d
font_01_sfnt_off00012edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDF 10996 bytes
SHA-256: a5e48047ea2a339a785867b5651c8da717b076559947a93e1d9148d7f2a0eb00
font_02_sfnt_off00014837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14837 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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