Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f9b23d8559849f2…

MALICIOUS

PDF

74.3 KB Created: 2021-09-26 19:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: da5188c36e221b627402d6b5418ad7a9 SHA-1: 88697a6b7769df3b0b872f4e615274291e9f3e56 SHA-256: 0f9b23d8559849f25da3bb52a03855e820971dbb61f8b74d2916a06510868c0d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=blockman+go+3 PDF link annotation
    • https://landatur.com/files/galeria/files/86842531533.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613791d09f6d1---vositakakewebuxujegifiko.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/86758816373.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/si1enjpa1eftlacp4o5kci6ge6/84617040423.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/16120168953.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/lovufuvizejakuvakepuli.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xopasevirosofuwase.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/45756115270.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-15/20210915192234210108.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/mimevokitenufademunigun.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/12435324395.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/taxewinemumumorilafufo.pdfIn PDF document text
    • http://grandfiltr.com/files/file/35566731598.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/42361923030.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/xasex.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/101353206207.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/bonivi.pdfIn PDF document text
    • https://cape-electronics.com/media/file/jiwejawunoselikikub.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/maxuketevi.pdfIn PDF document text
    • http://metzlerranch.com/userimages/jalipijukulozajaridit.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/xoruxaruta.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/rekuropavotudimuwedexe.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/49114992981.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/54420672222.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_off0000bcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB8 10300 bytes
SHA-256: 68dc6b768b5f21c3d0e5df06e4dd17bf0319c70960c6be5b10f750f38cefa788
font_01_sfnt_off0000d3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F2 18632 bytes
SHA-256: f345a9709cd16d803c1d1195e5e3f5fdde1d39d317db83e1be14672dace91428
font_02_sfnt_off0001042d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1