Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f80c281c4ae8438…

MALICIOUS

PDF

87.5 KB Created: 2021-09-09 07:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a0e6ae49eb19ddc70dbcc61f2165c228 SHA-1: d8dbecef1040fc08ff50fdb6df98b31480cd5451 SHA-256: 4f80c281c4ae84384f5c4724dcdf6b557bcb970413ccb8f7dd05fe76e3a144ee
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to 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 initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=learn+to+fly+2+unblocked PDF link annotation
    • http://cpils.com/userfiles/file/zodide.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/zigexabom.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384f9f31eca---tisixuwutekinepeduripi.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/zenoroxibuziwazajopo.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/46203481201.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/1755085033.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/85242032936.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/kesivolut.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/nudatomikuvu.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16135ff776b9dd---jibotuxa.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/gelipori.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/49686949063.pdfIn PDF document text
    • http://koala-al.com/d/files/3979068725.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/fibevijolapopodulejes.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/vizerewekivimuviture.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/kejakijozopuxodi.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/dalomatatobozuvevutirufu.pdfIn PDF document text
    • https://expomediainc.com/upload/file/45840150241.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/50340138837.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/tobubikiwi.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/towevozakepinuzepibe.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/nogiwumoloworimewenim.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/77064101425.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/woxoju.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_off0000ece5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE5 10732 bytes
SHA-256: 95f5c0cbaf588091774f9aa6751cade0abcaba180b048e9eebdf441194c3e20f
font_01_sfnt_off000105cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE1 19084 bytes
SHA-256: a42eb17b47621ee81d2ea80fa4ae48104a8e30645e9949d3a9937ab615a3bd54