Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f5fcc8c3270167…

MALICIOUS

PDF

73.5 KB Created: 2021-09-11 17:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1fbef554487ef14cb4cd6f7b0feae5b SHA-1: 2e23340879a77a6f8067a7e8e4697b37a378170f SHA-256: 51f5fcc8c32701678878aab7e9f69b661cdb73fdaf57498906c9e85681263f37
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's purpose is to host a large number of links, likely for phishing or redirecting to malicious sites. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://qishuochem.com/siicea/userfiles/file/wunumifes.pdf
    • http://highendschmiede.de/highendfiles/file/57379289674.pdf
    • http://jlssj.com/qianzi/upfile/case_editor/file/tabeno.pdf
    • http://learnersdigest.org/userfiles/file/defexibixusozipazejubi.pdf
    • http://mirai-kankyo.com/userfiles/files/14449180543.pdf
    • http://konberdbio.com/upload/files/loxuv.pdf
    • http://cathugo-yachts.de/res/wysiwyg/file/91104257772.pdf
    • http://fioredda.com/userfiles/files/vibijokonapukigejo.pdf
    • http://pc75.net/upfiles/file/1631368657.pdf
    • http://qualityspices.in/ckuploads/files/31165497146.pdf
    • http://rucodelniza.ru/userfiles/file/xepifoziloxemarekorodo.pdf
    • http://jlssj.com/qianzi/upfile/case_editor/file/leseme.pdf
    • http://albarossa.jp/js/upload/files/wonimovotagexomizir.pdf
    • https://g4m3s-4p1-12s1.com/contents/files/fawaran.pdf
    • http://celcg.pl/uploaded/file/55529616187.pdf
    • http://talleresjpg.es/img/file/lewezudirefidesulivup.pdf
    • http://xy-interior.com/uploads/files/202109071503446734.pdf
    • http://tw-jia.com/uploads/files/202109090305459780.pdf
    • https://slide-bearing.com/d/files/vodifusanexuja.pdf
    • https://granitnet.hu/editor_up/ropexawinotebixa.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1613be57eacabd---wuvazajotuwadizonixikizo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=redmi+9+wallpaper+size
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba9c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9C 16792 bytes
font_01_sfnt_off0000d2b3.bin
b45234109e1dc7ec6a925e85eb06c38aad518d4eb08c0de21dd874bcd5536eba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B3 10588 bytes
font_02_sfnt_off0000eaf5.bin
16591cba9750b21efd486e8ec64e8d22bb12f1b9649153ac6efc5efa17139c9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF5 17808 bytes

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