Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd0af71201b83e8d…

MALICIOUS

PDF

71.4 KB Created: 2021-09-09 00:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1712554837a1bb21b7a1e0173659507f SHA-1: 23bfad62f6d16aa504419c1c9fc7db437f40e15e SHA-256: cd0af71201b83e8d7a1d263956b3440e1bf6b55548f331d30707d810447b09a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to external domains, many of which are associated with link farms or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • 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://synerhu.ru/uplcv?utm_term=the+new+hangman+text+pdf PDF link annotation
    • http://pincesorvarshop.hu/editor_up/vonemurepotowolokor.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/47809479235.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/mezatetu.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/69181204261.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/xusodezuvolavewulerosawi.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/88004398418.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/2116927306.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/70297401992.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/zagadijazijilolibis.pdfIn PDF document text
    • http://tano-cable.com/d/files/kileraladitetapimux.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/rupamobaxezowe.pdfIn PDF document text
    • https://voxel-avocats.fr/uploads/file/In PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210902_16F8ACF5E651E7EB.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/nuzusetexamupedomunofel.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/sabuviwidamuvizad.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/95106402006.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/venokewuj.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/fanilul.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/20073236548.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/c04f6719be55c25f4e5291300dabdc98/49841208075.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/zutikizeb.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373799b7ae8---pamazudafubituz.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_off0000b6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D8 10568 bytes
SHA-256: 9f68faf67098e9daf4a643bb910b2f3e36fe6322ae8c2c3dd269652e927f39f8
font_01_sfnt_off0000ce9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B0 16020 bytes
SHA-256: acc3b99db38dd39944c177004ded04f161f49fae301f70d53a896e27109bea74

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