Malicious PDF — malware analysis report

Static analysis result for SHA-256 434490ae27f547f0…

MALICIOUS

PDF

72.6 KB Created: 2021-09-15 20:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c857cb8ed4050f9d83156c98bcc1339c SHA-1: e36fb9c88e495e9695f940daa0d94d8dcf853eda SHA-256: 434490ae27f547f069b7280fa97ea53b452c8ab32079df6b609714a0a18d9225
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous 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. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=round+background+android PDF link annotation
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/vukonilokadesema.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/barifodazojuw.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/37933362196.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/52596781241.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210901_221457.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/miwubowamanojonoduxivimux.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139419934efa---77343209993.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/juderovomalux.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ddb857351---77102116630.pdfIn PDF document text
    • http://movediary.com/userfiles/file/29447798680.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/jupafevijanivotep.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/bakoxuvegevepepeke.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/xuxifivulunogibabamiz.pdfIn PDF document text
    • https://kuepancong.com/contents/files/96271569012.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/55331259310.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/mavurimob.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/fozola.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202191127432020.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/60587227199.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/wasapumutobusejadu.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/69691796300.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/tutitepiga.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/mivofesunudekubofizu.pdfIn PDF document text
    • http://dasbluemchen.com/5493954206.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_off0000bba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA7 16080 bytes
SHA-256: 4e01f8834780320c594b9f00c0ffba68b92834874723e626022d80971f4eebec
font_01_sfnt_off0000e51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD33 10480 bytes
SHA-256: cf7ef6e13963a08dac50ea8ff9886a9009987804e1035e87dd0a4721b023d388

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