Malicious PDF — malware analysis report

Static analysis result for SHA-256 e216e4c6b9335e47…

MALICIOUS

PDF

88.0 KB Created: 2021-09-13 02:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 649bcd83cfd7a3f4a9297de3e35f2951 SHA-1: e2b2cda5ac7e3019710bae6e0c66b9d6ea077697 SHA-256: e216e4c6b9335e47bc67fa0dcba0b777c20e6cb7ce59016666154a2e470c72fe
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 PDF_URI and EMBEDDED_URL heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://avigailpekelman.com/sites/default/files/file/ruzunezikatikuxaxan.pdf In PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/d87e0a31403361a32bc18f079e24c641/91615318805.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/83962369070.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/80468671024.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/94926346612.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/tajifugu.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/bosolomoputirixi.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/40213427826.pdfIn PDF document text
    • https://duel.pl/userfiles/file/36558871607.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/fefox.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/bibugedu.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210912070650.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/jiwusov.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/95835877306.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/33843766176.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/74835595061.pdfIn PDF document text
    • https://beautydent.hu/editor_up/61595377176.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=nfa+minecraft+accounts+freePDF 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_off0000ef46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001075d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075D 10528 bytes
SHA-256: 309f24337d44bf065ebb3c3fbe603c967d74c029687f0ad2b31bafb7fa82d21c
font_02_sfnt_off00011f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F57 19604 bytes
SHA-256: f6326b37a1ba7ff9d5c77d77a271864b628040e3b3a004f30dce491dc8c7ce3b

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