Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e9be1e471c6f142…

MALICIOUS

PDF

73.9 KB Created: 2021-09-25 12:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f6f58e4b4c88b73fab8560d139c75d14 SHA-1: 11a0664a467b3c805bd8a5f9222fb64e07a96719 SHA-256: 0e9be1e471c6f1424fcbd96bf14056aa7efc074f843f001d3c456f0aee28f098
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to link farms 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.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coopinproject.eu/ckfinder/userfiles/files/borovemajasexitularef.pdf In PDF document text
    • http://reopen911.info/media/file/nudofiwodixirupibu.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631197821.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/vibediwi.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/rajotalosoxivov.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/xotomisefuz.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021091419163672.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210907070942.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/84785768801.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16149e9e04587d---98848883702.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/8777380035.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131d36dc074d---9677235441.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/towavisuwajezogifiwez.pdfIn PDF document text
    • http://nemochem.cn/upload/files/tizuduxofo.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/dulezatene.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kizerajon.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/43754242557.pdfIn PDF document text
    • http://budka39.ru/files/ledofufixarotelepajokiwi.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/setoxunekegalu.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/lemurazaparud.pdfIn PDF document text
    • https://theurbanthinktank.com/files/86738327319.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/nilaj.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/5589955584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=live+atc+apkPDF 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_off0000b92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB92C 19784 bytes
SHA-256: 7e7a12fdd41e214144c59551ae3255b6d296c7544180345d3cfba22eb8d19cd5
font_01_sfnt_off0000ec26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001043c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043C 9944 bytes
SHA-256: 9aa52de8c2f8be1d4ea5c01d61e12f3b4d53323d3b5ceff9eea1eaeee6ef82d7

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