Malicious PDF — malware analysis report

Static analysis result for SHA-256 108f0858918c573c…

MALICIOUS

PDF

74.9 KB Created: 2021-09-14 13:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8999837bc71a3a1969c3b93f8642d5a0 SHA-1: 6bdc28328d93f3f0c595698c18a1205e31074b4a SHA-256: 108f0858918c573c157339b852697d273980a7bc20740f351cdf5076010f6283
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing and scam operations. The PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://chineseclothingonline.com/File/pumarisutowanomadixepezi.pdf In PDF document text
    • http://altelaw.com/uploads/image/file/19857144513.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/83825931118.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/tudovovixejitifesemob.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/62608841426.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/25359764052.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/jusijemomejepowapok.pdfIn PDF document text
    • http://berbun.com/user_img/file/65124964601.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf453cffaa---93540610460.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/zakilakilevaxurupume.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/73240812049.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161313aa106acb---37874977776.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4e147aa18---70823882932.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/vupemitetuwafagumir.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/75186572240.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091107312190.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/kemuxupeg.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210903212429.pdfIn PDF document text
    • http://jinyezi.cn/upload/91167428660.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/50643977841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=swipe+up+and+down+gesture+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_off0000c027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC027 17272 bytes
SHA-256: 19f058e123fa602dfd1e0c5ec736750c0c4995ae67be1c362bb926d5c7b81d3c
font_01_sfnt_off0000ed69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10580 10784 bytes
SHA-256: 51e33a838ead05b7bb36663c0e3ec481500fe3da20fbd73464383f8bd9dd4319

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