Malicious PDF — malware analysis report

Static analysis result for SHA-256 400c0fcf224c9d71…

MALICIOUS

PDF

82.9 KB Created: 2021-10-04 23:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2cd7ed4b30042b39c6ec676ff13f5427 SHA-1: c3aa16715080809a5c0f69a75f6d49dc2e84adda SHA-256: 400c0fcf224c9d715de1c8ef58e20d0511545f35e34bded2812ae45b2d8b157d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains, likely to host further malicious content or phishing pages. The embedded URLs and the PDF's structure strongly suggest an attempt to trick users into clicking through to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://hum639hb2-hh38.com/contents/files/35710550102.pdf In PDF document text
    • http://sushifactoryazusa.com/uploads/files/letapefexexogadubir.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/1605851817.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/87728844757.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/56807453714.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/xilaragiz.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/39166695544.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/seruga.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/20210928163049372.pdfIn PDF document text
    • https://bawauang.com/contents/files/jitatewewel.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614aee33ee26c---guvizodezubuki.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/zugopobefigisexiwube.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/xupoperomokajo.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/8df9578f3a0f00685e7ad5933c5eaffd/didijarimesolupam.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/vezezurawirixusoxaf.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/61298596654.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/botokolatamiriwu.pdfIn PDF document text
    • https://apagar.cinemadossertoes.com/ckfinder/files/56606841050.pdfIn PDF document text
    • http://dps-bayside.com/uploadfile/editor/file/20210927221743150.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/purifotedubonazuguximadoz.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/62315617995.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/12586835619.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/jorufepafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=multiples+of+200PDF 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_off0000e282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE282 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA94 17448 bytes
SHA-256: a759ea43be3144a428babf8f7586ac9ed14db85a6dfb56917bfc0f2452685eb2
font_02_sfnt_off000126c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C7 10320 bytes
SHA-256: 31f9a33cf8b1a962a9240fd95d9b0b9c2635beac4c1c91af4e74c175cb18f015

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