Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd128a6d5a07732…

MALICIOUS

PDF

80.1 KB Created: 2021-09-16 10:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8d25a79c426227820cb5eb7066595c9e SHA-1: 3c0d1607ad02782ef55b8f2e34a6c3db58987060 SHA-256: 1fd128a6d5a07732392b2f0ce813d713632c489f6c08a94327c476688e46062e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=how+to+send+apps+in+bluetooth PDF link annotation
    • http://reylab.com/userfiles/file/46646138231.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/bugixizesifovoromolemulik.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/sazefufotosojuve.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/dumikubap.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/70040785927.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/dawefofibivusarufodaja.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/61140430211.pdfIn PDF document text
    • http://storemisr.com/uploads/files/pofolakogazojatopotani.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/karozi.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/87899276332.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/55076773937.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/52666998830.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/telabitubape.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a419a62372---40119896667.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/daxepibesabus.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210907_864BC88C81946748.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/banepozosupatewobabo.pdfIn PDF document text
    • http://hflchw.com/upload/file/47897258329.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/30596289850.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133d038372e7---fokexemugejasesilajaleg.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/lokunapala.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/97587625472.pdfIn PDF document text
    • http://agilesolutions.in/uploads/60557155768.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/zopujosuwetozozimokuwaw.pdfIn PDF document text
    • 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_off0000d776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD776 10704 bytes
SHA-256: 6481b7b62a61c7190dbf70513d739dffc3560bfd86ac9e06bd49877f98219952
font_01_sfnt_off0000efba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CC 16524 bytes
SHA-256: 93e29ff678bea35d019709b0452f9c1df78e8a9b71719e065a65b18d3b15c550

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