Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca68eceaf2c9d648…

MALICIOUS

PDF

91.6 KB Created: 2021-09-04 15:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: afad0cff6bba518d979632c2ac684701 SHA-1: 4d4a12c8d44def9f00a1838eb3ff63b92891720e SHA-256: ca68eceaf2c9d648aee18f315f1fba740f1b5933ae6d3f204d72c17f93e72a85
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of multiple PDF links suggests an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • 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://popmetre.com/news/files/lixamedaxegivumebi.pdf In PDF document text
    • http://aifamilyreunion.com/clients/59202/File/golik.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/78170445843.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/xokofotelogizozugoviveb.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/77572357799.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/fidekuzize.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/kobojobumoromadum.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160797d06793ce---losena.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/koguwonu.pdfIn PDF document text
    • http://agrion.org/upload/fichier/jaripobi.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608495b321c44---tupajenak.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/79854271653.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/14049483475.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/pemavemilugazorul.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/zujoxudepajoz.pdfIn PDF document text
    • http://aa-nusd.jp/75782537782.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4e191f252---figevoz.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/1950008082.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/76985230752.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/85135448262.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/77568286108.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/xapixikakoxu.pdfIn PDF document text
    • http://agavietnam.com/img/files/ziwinowotag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=nonequilibrium+statistical+mechanics+zwanzig+pdfPDF 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_off0000ff7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7E 18072 bytes
SHA-256: 3d086e4e1f958c04a1130af957869fe816654cd8db4be1cfb9031d744af24375
font_01_sfnt_off00012dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145ED 11576 bytes
SHA-256: 41a5715df967f80f22bbdb8d3821187046a6b31edd938ec326c2dafaa286c11e

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