Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae0fff33eee4737b…

MALICIOUS

PDF

71.2 KB Created: 2021-09-19 22:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4bf99210bd8096b88a30dc5f10998e81 SHA-1: 02ecec468c04fed837b642800f3cd35cf7d052b8 SHA-256: ae0fff33eee4737b4479544915f23d575d36547f08f1f5c3cfffffb651b16794
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=evocreo+original+apk PDF link annotation
    • http://sacoorhealth.pt/site/upload/file/7650781921.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/69417344006.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/62275357029.pdfIn PDF document text
    • http://recviem.ru/img/upload/pagasimamegegivoparoxagix.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/pemixa.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e08461df8a---ripubixevu.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/vuxusabukagepajuxesowedi.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/16988368840.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/65572796024.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/keguxudasalunerofisalas.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142cdc05416a---wikederozuwedew.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/tedajoninotumosugugesuzep.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/3294348615.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/55523290616.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_off0000af4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4F 10424 bytes
SHA-256: 5003fa69ac47a573f6631656f5828964570dd987d7e4e0e1bbc2aaf82d69a846
font_01_sfnt_off0000c6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FC 18908 bytes
SHA-256: c72c360d2f1e73c678c146cb53061f6963c7e6146b951c0d572aaee87fc2ca3c
font_02_sfnt_off0000f83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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