Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff04d054355cfcc…

MALICIOUS

PDF

70.4 KB Created: 2021-09-09 17:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d8751ff602dddc667ebcc4a4e43c557f SHA-1: 49aab773ffaf81d938c58b23595b2196343ace8a SHA-256: 8ff04d054355cfccc3911acf21fbb6c40a98ce60bd893ef50cacb2df668b88f4
134 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 ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://medvor.ru/uplcv?utm_term=psp+cricket+games+2019 PDF link annotation
    • http://sinoorchids.com/image/file/55003924874.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/buxelisatep.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/jetufidezirurolu.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/29286406930.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/28020734611.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/jefajawifezobexo.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/fipumoxurilurobasoz.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090315330921.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210906091014150.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/ginasibowizuzevuberujefuk.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67101959472.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/85975134699.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/42046593072.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/verowabafazimonoken.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/20366303313.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/selugevamoxotukulepijow.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/47726031745.pdfIn PDF document text
    • http://bastola.org/userfiles/file/48062510529.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/mitoxifejagedezorajipiker.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324863a950c---38372317640.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139b41d09bc6---tetenogirawikijo.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/misabizobexifalag.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_off0000b26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26B 15700 bytes
SHA-256: 9e44a990a116ac3acfc016d08288404d9941b29717335dd00e901252ec24b622
font_01_sfnt_off0000dac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC8 11004 bytes
SHA-256: 876f77aceeb1485fe29d941d1de1e3b08f8713d04ea504709922877eb962ba03
font_02_sfnt_off0000f488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF488 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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