Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9f704412a29407…

MALICIOUS

PDF

80.4 KB Created: 2021-09-16 10:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 17a3d07d55203b5b23f5a69a5f1d8923 SHA-1: c5f77b5926098242c2afb1afcadc95cada34d3d8 SHA-256: 5d9f704412a29407cc207933e6617c30089513cdcbe85e56dcb8ccb6c548e939
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also exhibits characteristics of a link farm, with numerous external URIs pointing to various domains, suggesting a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://theheavent.com/userfiles/files/taguderojevokujipiwekexaf.pdf In PDF document text
    • https://badoza.net/userfiles/file/77411347968.pdfIn PDF document text
    • https://tekartltd.com/upload/files/wupedogoxisijawadigo.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/36386596174.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/xezitiverivajir.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/xebabubofomexu.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/giziludomekanuru.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/57056473230.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/20939228667.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/32636982269.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/rakekoxigidesixinazudupom.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/wizesoroxejogapigudeti.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/zagikusekiw.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/970421914.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/rutuzakugojaxogejajosigek.pdfIn PDF document text
    • http://skupka23.ru/upload/m/64433411187.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/2888671091.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/todakipaxovesazubar.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613781bf2d636---xuvofiwemigaxoxativir.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/73773819022.pdfIn PDF document text
    • https://people11people.com/uploads/File/84797502505.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/kolotapoxekalojogogap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=stick+fight+the+game+mod+apkPDF 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_off0000d625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD625 10816 bytes
SHA-256: ae4f6bfbebdb3108ba8e58a07ec0d1c11e4f8bd6e2d345097f6e940cee8d5192
font_01_sfnt_off0000eeef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEF 17380 bytes
SHA-256: 2f6b7ed5b8e8e6e76bb54cd1c23bb45555ea99d49bdaa1f003da8eeda018352b
font_02_sfnt_off00011c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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