Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4552e5ad8e15d67…

MALICIOUS

PDF

62.3 KB Created: 2021-09-23 06:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dd48d5c6484183e1994eaeab19418dab SHA-1: 177f400b81a37cd8289efcdcab65c0d984fe0455 SHA-256: d4552e5ad8e15d670e054ba7ffac194da95b20beb5d39b212edeb89f21ccc0e4
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6412

Heuristics 5

  • 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
  • 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://cructi.ru/uplcv?utm_term=nova+versao+android PDF link annotation
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135a7448dabe---fimozawerabovorujasorabo.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/zizozose.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/tafabovuduxa.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/93497295099.pdfIn PDF document text
    • https://unaizahic.com/Files/files/33483174342.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/56813370827.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/14112841102.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/ridujubimurosewosumuvefew.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/57895903368.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161434b5bb76a1---87463713517.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/13246584548.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/40136673129.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/48663798600.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/sunuj.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/81231933970.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/30593711158.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/90247068196.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/detasufabobibumuxujewoj.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/16805827637.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210916_BA40879C95D77C7E.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/pifogetaji.pdfIn PDF document text
    • http://halaljones.com/uploads/files/xudunoparowadudetukujoli.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/26555897053.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/62902385909.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/dubarikifudoxorazurowebot.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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