Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8373ca529c6976d…

MALICIOUS

PDF

70.6 KB Created: 2021-09-26 00:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3195330a8483272ace7bbc9928dec537 SHA-1: 3d73f26818f6f6af334f652aba9b3cff34673769 SHA-256: d8373ca529c6976d0e002c140ae57b03e30a400fedb670591f3e5994d755baac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to unknown or potentially malicious domains, suggesting a link farm or phishing lure. The PDF structure and heuristic firings indicate it is designed to redirect users to external content, likely for further exploitation or credential harvesting.

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 http://samuiluxurytravel.com/Uploads/file/74524006574.pdf In PDF document text
    • http://donghotam.com/luutru/files/juxedur.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/kawapafisofuzinidexikipog.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/14334604372.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/50092828386.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/39151795460.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/94528909644.pdfIn PDF document text
    • https://resicolor.com/upload/files/71545733449.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328ec29512f---64714838601.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/11245040217.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/47280826797.pdfIn PDF document text
    • http://jsdarvin.com/files/30814735633.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109030148269266.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/91949029870.pdfIn PDF document text
    • https://tavio.ru/files/file/46609737052.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210905_286D0D3CBEE0462B.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/58347629376.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/dakigeselo.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/78022419354.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/faxevo.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/12026898282.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/supapefoxivoxigoduzul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+witcher+series+free+download+for+androidPDF 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_off0000b11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11E 10620 bytes
SHA-256: 1d2f961b395ac91e1cade463ba751a56129c35c025d65d63e088674178d53921
font_01_sfnt_off0000c973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE185 16240 bytes
SHA-256: 50be3f777743fac78564c47928931d4ae9b0ef35be2a3094af68c78e52e8b7be

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