Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e7bd954c9e5c84…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 23:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5f9cc6962c23b222b574a61ea67fa295 SHA-1: c471ac48852ed9791d14bf3980a4e4cb0028b382 SHA-256: a9e7bd954c9e5c846776a84849537c72eae51c8c3581cdcc4a5c215bbbdde8ae
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to one of the numerous external URLs found in the document, which are often used for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://polymer-optix.de/userfiles/file/3293164261.pdf In PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/nuxiza.pdfIn PDF document text
    • http://3sdent.com/upload/files/40603930782.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/jonovijib.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/8d49ec1ef7e86cc266ec4e123ef1ceb6/81603365503.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/55043160335.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/wixezakozudedetanajose.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/didetok.pdfIn PDF document text
    • https://digireg.at/upload/90500389004.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/sawatifawabusuzokitela.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/zopekuvagagebozidabamisi.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210907031812.pdfIn PDF document text
    • http://tayles.com/uploaded/zabuverezodajakomini.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/megitezigudukovurik.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/lufijuvupumogomofivew.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/75649601488.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/40246275069.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/fawopitomizamew.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/sutujonigegidasiwazurupe.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/62938129008.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/f541948a1742f615dd681dafdccd90d1/sutezemebapukuvimemapeja.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/6453522834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=hard+reset+xiaomi+note+9+proPDF 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_off0000da95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA95 18248 bytes
SHA-256: eb2516ff0a87396f6b3f7b5cfe7a74ad3c09cfed5a07283f2150e28e6467a6eb
font_01_sfnt_off000109b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B1 10768 bytes
SHA-256: 3fe4db5d55accaa1e69820640a1c34e8839bfba2d54f88f8517356c035c73335
font_02_sfnt_off00012270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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