Malicious PDF — malware analysis report

Static analysis result for SHA-256 71436166decdc221…

MALICIOUS

PDF

84.2 KB Created: 2021-09-10 13:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aeab046dd110927c829253fc9796e47f SHA-1: 01f17b4d63b11213b0109a8a5af3eb5a19f1f645 SHA-256: 71436166decdc221d3744535f0da4f19e04969709a5d500d5f44935cf9fa6a70
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. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to one of the numerous external URLs, which are often used for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://shih-tzu.ro/files/file/18777104208.pdf In PDF document text
    • http://cancercareresearch.com/userfiles/file/58700093172.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/71433236268.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/45406194256.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/86278829655.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/rajotewukabiwodomoxufe.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/43955484188.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/wunoninapebijaje.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/zowolagedej.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/bokeririfebeluxinewipo.pdfIn PDF document text
    • http://allier-genealogie.org/File:/borijelunazip.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/joxepubabigo.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/99462821890.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/82030503510.pdfIn PDF document text
    • http://belniig.by/public/file/88966179952.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/11474033392.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/keniwirimami.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/gikogunetijotak.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613444578befe---71166474524.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/13754639853.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090123380673499.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/mazazufalowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=apps+for+animation+on+androidPDF 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_off0000e5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E4 17696 bytes
SHA-256: 64d0c90e3a9b2b3e35102bc0f4258144f006221ecbf0506a5e31826ea36b9e3f
font_01_sfnt_off000113ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AD 10464 bytes
SHA-256: 9102e058db6269492881da0a1dbd6f0d43eb182d9641a02bb9e3beea6727fa5c
font_02_sfnt_off00012b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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