Malicious PDF — malware analysis report

Static analysis result for SHA-256 da08b81023cf752a…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 02:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ddadda3f7ec44bd7eabe0f16111d0f79 SHA-1: c553fbebc656327dddda02ed3ae7137164316f68 SHA-256: da08b81023cf752a23f09dbb809bc4d8d3c79059fbb411eec0f0fd20d6237c2f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://allytemp.ru/uplcv?utm_term=como+formatar+celular+lg+optimus+l5 PDF link annotation
    • http://seychelles-resort.com/images/blog/file/3447944318.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/85934947484.pdfIn PDF document text
    • https://svilia.restavracia02.com/userfiles/file/baturex.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/84610053805.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/68570347121.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/popebibes.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/65352443160.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/zuwusunutiludubis.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/lurot.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc4e9072b4---vagigomegurobufagegesi.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/71440484629.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/52125719402.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109060623108459.pdfIn PDF document text
    • http://matras-devison.com/upload/file/gabimadufew.pdfIn PDF document text
    • https://themalc.org/files/file/13901103495.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/godalivuguzagafujegejo.pdfIn PDF document text
    • http://mylodge-naoshima.com/36736797768.pdfIn PDF document text
    • https://onecre.com/images/content/files/sapuvotujelajudedunezupim.pdfIn PDF document text
    • http://jcpingie.be/public/files/19299653396.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/vakalovesodufodivene.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/pasujigida.pdfIn PDF document text
    • http://kant21.com/userData/board/file/molorofenekuwuwusizo.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/jamikajemuturi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF45 17780 bytes
SHA-256: 661b0085ca6c359a57407c622b22e476c01538b30480a3f8580bc817d607cbdb
font_01_sfnt_off0000da10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA10 10984 bytes
SHA-256: 1618a75a85fe8d2a26c4d88e6ea5416669c445ce3ce64b0dc2880861b4a90426
font_02_sfnt_off0000f3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AF 17692 bytes
SHA-256: c54c9dfa03c79f60dbdb91590f178c11e0a3e694510b7d90c756a14e2486d6fe
font_03_sfnt_off000121d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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